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Manual of Manual of Structural Structural KinesiologyKinesiology The Knee JointThe Knee Joint 10-10-11
Chapter 10Chapter 10The Knee JointThe Knee Joint
Manual of Structural KinesiologyManual of Structural KinesiologyR.T. Floyd, Ed.D, ATC, CSCSR.T. Floyd, Ed.D, ATC, CSCS
Copyright © The McGraw-Hill Companies, Inc. Reprinted by permission.
Manual of Manual of Structural Structural KinesiologyKinesiology The Knee JointThe Knee Joint 10-10-22
The Knee JointThe Knee Joint
• Knee jointKnee joint– largest largest
joint in joint in bodybody
– very very complexcomplex
– primarily primarily a hinge a hinge jointjoint
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BonesBones
• Enlarged femoral condyles articulate Enlarged femoral condyles articulate on enlarged tibial condyleson enlarged tibial condyles
• Medial & lateral tibial condyles (medial Medial & lateral tibial condyles (medial & lateral tibial plateaus) - receptacles & lateral tibial plateaus) - receptacles for femoral condylesfor femoral condyles
• Tibia – medialTibia – medial– bears most of weightbears most of weight
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BonesBones
• Fibula - lateralFibula - lateral– serves as the serves as the
attachment for attachment for knee joint knee joint structuresstructures
– does not does not articulate with articulate with femur or patellafemur or patella
– not part of knee not part of knee jointjoint
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BonesBones
• PatellaPatella– sesamoid (floating) bonesesamoid (floating) bone– imbedded in quadriceps imbedded in quadriceps
& patellar tendon& patellar tendon– serves similar to a pulley serves similar to a pulley
in improving angle of in improving angle of pull, resulting in greater pull, resulting in greater mechanical advantage in mechanical advantage in knee extensionknee extension
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BonesBones
• Key bony landmarksKey bony landmarks– Superior & inferior patellar Superior & inferior patellar
polespoles– Tibial tuberosityTibial tuberosity– Gerdy’s tubercleGerdy’s tubercle– Medial & lateral femoral Medial & lateral femoral
condylescondyles– Upper anterior medial tibial Upper anterior medial tibial
surfacesurface– Head of fibulaHead of fibula
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BonesBones
• Three vasti muscles of quadriceps Three vasti muscles of quadriceps originate on proximal femur & insert on originate on proximal femur & insert on patellar superior polepatellar superior pole– insertion is ultimately on tibial tuberosity insertion is ultimately on tibial tuberosity
via patella tendonvia patella tendon
• Iliotibial tract of tensor fasciae latae Iliotibial tract of tensor fasciae latae inserts on Gerdy’s tubercleinserts on Gerdy’s tubercle
• Sartorius, gracilis, & semitendinosus Sartorius, gracilis, & semitendinosus insert just below the medial condyle on insert just below the medial condyle on upper anteromedial tibial surfaceupper anteromedial tibial surface
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BonesBones
• Semimembranosus inserts posteromedially Semimembranosus inserts posteromedially on medial tibial condyleon medial tibial condyle
• Biceps femoris inserts primarily on fibula Biceps femoris inserts primarily on fibula headhead
• Popliteus originates on lateral aspect of Popliteus originates on lateral aspect of lateral femoral condylelateral femoral condyle
• Tibial collateral ligament originates on Tibial collateral ligament originates on medial aspect of upper medial femoral medial aspect of upper medial femoral condyle & inserts on medial tibial surfacecondyle & inserts on medial tibial surface
• Fibula collateral originates on lateral femoral Fibula collateral originates on lateral femoral condyle very close to popliteus origin & condyle very close to popliteus origin & inserts on fibular headinserts on fibular head
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JointsJoints
• Knee joint proper (tibiofemoral Knee joint proper (tibiofemoral joint)joint)– classified as a ginglymus jointclassified as a ginglymus joint
• Sometimes referred to as Sometimes referred to as trochoginglymus joint internal & external trochoginglymus joint internal & external rotation occur during flexionrotation occur during flexion
• Some argue for condyloid classificationSome argue for condyloid classification
• Patellofemoral jointPatellofemoral joint– arthrodial classification arthrodial classification – gliding nature of patella on femoral gliding nature of patella on femoral
condylescondyles
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JointsJoints
• Ligaments provide static stabilityLigaments provide static stability• Quadriceps & hamstrings contractions Quadriceps & hamstrings contractions
produce dynamic stabilityproduce dynamic stability• Articular cartilage surfaces on femur & tibiaArticular cartilage surfaces on femur & tibia• Menisci form cushions between bonesMenisci form cushions between bones
– attached to tibia attached to tibia – deepen tibial fossadeepen tibial fossa– enhance stabilityenhance stability
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JointsJoints
• Medial meniscus forms receptacle for Medial meniscus forms receptacle for medial femoral condyle, Lateral medial femoral condyle, Lateral meniscus receives lateral femoral meniscus receives lateral femoral condylecondyle– Thicker on outside border & taper down Thicker on outside border & taper down
very thin to inside bordervery thin to inside border– Can slip about slightly, but held in place by Can slip about slightly, but held in place by
various small ligamentsvarious small ligaments– Medial meniscus - larger & more open Medial meniscus - larger & more open CC
appearanceappearance– Lateral meniscus - closed Lateral meniscus - closed CC configuration configuration
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JointsJoints
– Either or both menisci may be Either or both menisci may be torn in several different areas torn in several different areas from a variety of mechanisms, from a variety of mechanisms, resulting in varying degrees of resulting in varying degrees of problemsproblems•Tears often occur due significant Tears often occur due significant
compression & shear forces during compression & shear forces during rotation while flexing or extending rotation while flexing or extending during quick directional changes in during quick directional changes in runningrunning
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JointsJoints
• Anterior & posterior cruciate ligamentsAnterior & posterior cruciate ligaments– cross within knee between tibia & femurcross within knee between tibia & femur– vital in respectively maintaining anterior & vital in respectively maintaining anterior &
posterior stability, as well as rotatory stabilityposterior stability, as well as rotatory stability
• Anterior cruciate ligament (ACL) injuriesAnterior cruciate ligament (ACL) injuries– one of most common serious injuries to kneeone of most common serious injuries to knee– mechanism often involves noncontact rotary mechanism often involves noncontact rotary
forces associated with planting & cutting, forces associated with planting & cutting, hyperextension, or by violent quadriceps hyperextension, or by violent quadriceps contraction which pulls tibia forward on femur contraction which pulls tibia forward on femur
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JointsJoints
• Posterior cruciate Posterior cruciate ligament (PCL) injuriesligament (PCL) injuries– not often injurednot often injured– mechanism of direct mechanism of direct
contact with an contact with an opponent or playing opponent or playing surfacesurface
• Fibular (lateral) Fibular (lateral) collateral ligament collateral ligament (LCL)(LCL)– infrequently injuredinfrequently injured
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JointsJoints
• Tibial (medial) collateral ligament Tibial (medial) collateral ligament (MCL)(MCL)– maintains medial stability by resisting maintains medial stability by resisting
valgus forces or preventing knee from valgus forces or preventing knee from being abductedbeing abducted
– injuries occur commonly, particularly in injuries occur commonly, particularly in contact or collision sports contact or collision sports
– mechanism of teammate or opponent may mechanism of teammate or opponent may fall against lateral aspect of knee or leg fall against lateral aspect of knee or leg causing medial opening of knee joint & causing medial opening of knee joint & stress to medial ligamentous structuresstress to medial ligamentous structures
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JointsJoints
• Synovial cavitySynovial cavity– supplies knee with synovial fluid supplies knee with synovial fluid – lies under patella and between surfaces of lies under patella and between surfaces of
tibia & femurtibia & femur– "capsule of the knee”"capsule of the knee”
• Infrapatellar fat padInfrapatellar fat pad– just posterior to patellar tendonjust posterior to patellar tendon– an insertion point for synovial folds of tissue an insertion point for synovial folds of tissue
known as “plica”known as “plica”• an anatomical variant that may be an anatomical variant that may be
irritated or inflamed with injuries or irritated or inflamed with injuries or overuse of the kneeoveruse of the knee
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JointsJoints
• BursaeBursae– more than 10 more than 10
bursae in & bursae in & around kneearound knee
– some are some are connected to connected to synovial cavitysynovial cavity
– they absorb they absorb shock or shock or prevent frictionprevent friction
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JointsJoints
• Extends to 180 degrees (0 Extends to 180 degrees (0 degrees of flexion)degrees of flexion)
• Hyperextension of 10 degrees Hyperextension of 10 degrees or > not uncommonor > not uncommon
• Flexion occurs to about 140 Flexion occurs to about 140 degreesdegrees
• With knee flexed 30 degrees or With knee flexed 30 degrees or >>– internal rotation 30 degrees occursinternal rotation 30 degrees occurs– external rotation 45 degrees external rotation 45 degrees
occurs occurs
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JointsJoints• Knee “screws home” to fully extend due Knee “screws home” to fully extend due
to the shape of medial femoral condyleto the shape of medial femoral condyle– As knee approaches full extension tibia As knee approaches full extension tibia
must externally rotate approximately 10 must externally rotate approximately 10 degrees to achieve proper alignment of degrees to achieve proper alignment of tibial & femoral condylestibial & femoral condyles
– In full extensionIn full extension• close congruency of articular surfacesclose congruency of articular surfaces• no appreciable rotation of kneeno appreciable rotation of knee
– During initial flexion from full extensionDuring initial flexion from full extension• knee “unlocks” by tibia rotating knee “unlocks” by tibia rotating
internally, to a degree, from its externally internally, to a degree, from its externally rotated position to achieve flexion rotated position to achieve flexion
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MovementsMovements
• FlexionFlexion– bending or decreasing bending or decreasing
angle between femur & angle between femur & leg, characterized by heel leg, characterized by heel moving toward buttocksmoving toward buttocks
• ExtensionExtension– straightening or straightening or
increasing angle between increasing angle between femur & lower legfemur & lower leg
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MovementsMovements
• External rotationExternal rotation– rotary movement of leg rotary movement of leg
laterally away from midlinelaterally away from midline
• Internal rotationInternal rotation– rotary movement of lower rotary movement of lower
leg medially toward midlineleg medially toward midline
• Neither will occur unless Neither will occur unless flexed 20-30 degrees or >flexed 20-30 degrees or >
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MusclesMuscles• Quadriceps muscle Quadriceps muscle
groupgroup– extends kneeextends knee– located in anterior located in anterior
compartment of thighcompartment of thigh– consists of 4 musclesconsists of 4 muscles
• rectus femorisrectus femoris• vastus lateralisvastus lateralis• vastus intermediusvastus intermedius• vastus medialisvastus medialis
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MusclesMuscles• Hamstring muscle groupHamstring muscle group
– responsible for knee flexionresponsible for knee flexion– located in posterior compartment of located in posterior compartment of
thighthigh– consists of 3 musclesconsists of 3 muscles
• semitendinosus - medial, internal rotatorsemitendinosus - medial, internal rotator• semimembranosus - medial, internal rotatorsemimembranosus - medial, internal rotator• biceps femoris - lateral, external rotatorbiceps femoris - lateral, external rotator
• Popliteus assist medial hamstrings in Popliteus assist medial hamstrings in knee internal rotationknee internal rotation
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MusclesMuscles• Two-joint musclesTwo-joint muscles
– most effective when either origin or most effective when either origin or insertion is stabilized to prevent insertion is stabilized to prevent movement in direction of the movement in direction of the contacting musclecontacting muscle
– To a degree, muscles are able to To a degree, muscles are able to exert greater force when lengthened exert greater force when lengthened than when shortenedthan when shortened
– Hamstring muscles & rectus femoris Hamstring muscles & rectus femoris are biarticular (two-joint) musclesare biarticular (two-joint) muscles
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MusclesMuscles• Ex. sartorius muscleEx. sartorius muscle
– increases its total length & becomes a increases its total length & becomes a better flexor at knee when pelvis is better flexor at knee when pelvis is rotated posteriorly & stabilized by rotated posteriorly & stabilized by abdominal musclesabdominal muscles• exemplified by trying to flex knee & cross the exemplified by trying to flex knee & cross the
legs in the sitting positionlegs in the sitting position• one usually leans backward to flex legs at one usually leans backward to flex legs at
kneesknees
– Football kicker invariably leans well Football kicker invariably leans well backward to raise & fix the rectus femoris backward to raise & fix the rectus femoris origin to make it more effective as a knee origin to make it more effective as a knee extensorextensor
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MusclesMuscles
• Gracilis, sartorius, & semitendinosus join Gracilis, sartorius, & semitendinosus join together distally to form pes anserinustogether distally to form pes anserinus– attaches to anteromedial aspect of proximal attaches to anteromedial aspect of proximal
tibia below the level of tibial tuberositytibia below the level of tibial tuberosity– Their attachment & posteromedially line of Their attachment & posteromedially line of
pull enable them to assist with knee flexion pull enable them to assist with knee flexion particularly once the knee is flexed & hip is particularly once the knee is flexed & hip is externally rotatedexternally rotated
• Medial & lateral gastrocnemius heads Medial & lateral gastrocnemius heads attach posteriorly on medial & lateral attach posteriorly on medial & lateral femoral condylesfemoral condyles– assist with knee flexion assist with knee flexion
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MusclesMuscles
Knee joint muscles Knee joint muscles locationlocation
• Anterior - primarily Anterior - primarily knee extensionknee extension– Rectus femorisRectus femoris– Vastus medialisVastus medialis– Vastus intermediusVastus intermedius– Vastus lateralisVastus lateralis
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MusclesMuscles
Knee joint muscles locationKnee joint muscles location• Posterior - primarily knee Posterior - primarily knee
flexionflexion– Biceps femorisBiceps femoris– SemimembranosusSemimembranosus– SemitendinosusSemitendinosus– SartoriusSartorius– GracilisGracilis– PopliteusPopliteus– Gastrocnemius Gastrocnemius
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NervesNerves• Femoral nerves Femoral nerves
innervates the knee innervates the knee extensors extensors (quadriceps)(quadriceps)– rectus femorisrectus femoris– vastus medialisvastus medialis– vastus intermediusvastus intermedius– vastus lateralis vastus lateralis
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NervesNerves• Sciatic nerveSciatic nerve
– tibial divisiontibial division• semitendinosus, semitendinosus,
semimembranosus, semimembranosus, biceps femoris (long biceps femoris (long head) head)
– common peroneal common peroneal (fibular) division(fibular) division• biceps femoris (short biceps femoris (short
head)head)
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Quadriceps Quadriceps MusclesMuscles
• Quadriceps muscles - vital in Quadriceps muscles - vital in jumpingjumping– functions as a deceleratorfunctions as a decelerator
• when decreasing speed to change when decreasing speed to change directiondirection
• when coming down from a jumpwhen coming down from a jump
– eccentric contraction during eccentric contraction during decelerating actionsdecelerating actions
– controls slowing of movements controls slowing of movements initiated in previous phases of the initiated in previous phases of the sports skillsports skill
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Quadriceps Quadriceps MusclesMuscles
• Rectus femoris (two-joint), vastus Rectus femoris (two-joint), vastus medialis, vastus intermedius, vastus medialis, vastus intermedius, vastus lateralis (largest)lateralis (largest)• All attach to patella then to tibial tuberosity All attach to patella then to tibial tuberosity
via patellar tendonvia patellar tendon• All superficial & palpable except vastus All superficial & palpable except vastus
intermedius (under rectus femoris)intermedius (under rectus femoris)• Strength or power may be indicated by Strength or power may be indicated by
vertical jump testvertical jump test• Generally desired to be 25% to 33% stronger Generally desired to be 25% to 33% stronger
than hamstring groupthan hamstring group
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Quadriceps Quadriceps MusclesMuscles
• Strength & endurance is essential for Strength & endurance is essential for maintenance of patellofemoral stabilitymaintenance of patellofemoral stability– often a problemoften a problem– quads are particularly prone to atrophy quads are particularly prone to atrophy
when injuries occurwhen injuries occur– may be developed by resisted knee may be developed by resisted knee
extension activities from a seated positionextension activities from a seated position– functional weight bearing activities such functional weight bearing activities such
as step-ups or squats are particularly as step-ups or squats are particularly useful for strengthening & enduranceuseful for strengthening & endurance
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Rectus Femoris Rectus Femoris MuscleMuscle
Flexion of hipFlexion of hip
Extension of Extension of kneeknee
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Vastus Lateralis Vastus Lateralis MuscleMuscle
Extension of Extension of kneeknee
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Vastus Intermedius Vastus Intermedius MuscleMuscle
Extension of Extension of kneeknee
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Vastus Medialis Vastus Medialis MuscleMuscle
Extension of Extension of kneeknee
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Hamstring Hamstring MusclesMuscles
• Hamstring muscle groupHamstring muscle group– SemitendinosusSemitendinosus– Biceps femorisBiceps femoris– SemimembranosusSemimembranosus
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Hamstring Hamstring MusclesMuscles• Hamstring muscle strains very commonHamstring muscle strains very common• ““Running muscles” function in accelerationRunning muscles” function in acceleration• Antagonists to quadriceps muscles at kneeAntagonists to quadriceps muscles at knee• Named for cordlike attachments at kneeNamed for cordlike attachments at knee• All originate on ischial tuberosity of pelvisAll originate on ischial tuberosity of pelvis• Semitendinosus inserts on anteromedial tibiaSemitendinosus inserts on anteromedial tibia• Semimembranosus inserts on posteromedial Semimembranosus inserts on posteromedial
tibiatibia• Biceps femoris inserts on lateral tibial condyle Biceps femoris inserts on lateral tibial condyle
& head of fibula& head of fibula
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Semitendinosus Semitendinosus MuscleMuscle
Flexion of kneeFlexion of knee
Extension of hipExtension of hip
Internal Internal rotation of rotation of hiphip
Internal Internal rotation of rotation of knee knee
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Semimembranosus Semimembranosus MuscleMuscle
Flexion of kneeFlexion of knee
Extension of hipExtension of hip
Internal rotation Internal rotation of hipof hip
Internal rotation Internal rotation of knee of knee
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Biceps Femoris MuscleBiceps Femoris Muscle
Flexion of Flexion of kneeknee
Extension Extension of hipof hip
External External rotation rotation of hipof hip
External External rotation rotation of knee of knee
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Popliteus MusclePopliteus Muscle Flexion of kneeFlexion of knee
Internal Internal rotation of rotation of flexed knee flexed knee
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Knee ExtensionKnee Extension
• AgonistsAgonists– Rectus FemorisRectus Femoris– Vastus LateralisVastus Lateralis– Vastus IntermediusVastus Intermedius– Vastus MedialisVastus Medialis
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Knee FlexionKnee Flexion• AgonistsAgonists
– Biceps Femoris Biceps Femoris (Long Head)(Long Head)
– SemitendinosusSemitendinosus– SemimembranosusSemimembranosus
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Knee Internal RotationKnee Internal Rotation
• AgonistsAgonists– SemitendinosusSemitendinosus– SemimembranosusSemimembranosus– PopliteusPopliteus
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Knee External RotationKnee External Rotation
• AgonistsAgonists– Biceps FemorisBiceps Femoris
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Web SitesWeb SitesAnatomy & Physiology Tutorials
www.gwc.maricopa.edu/class/bio201/index.htmRadiologic Anatomy Browser
http://radlinux1.usuf1.usuhs.mil/rad/iong/index.html– This site has numerous radiological views of the
musculoskeletal system.University of Arkansas Medical School Gross Anatomy for
Medical Students http://anatomy.uams.edu/htmlpages/anatomyhtml/gross.html– Dissections, anatomy tables, atlas images, links, etc.
Loyola University Medical Center: Structure of the Human Body www.meddean.luc.edu/lumen/MedEd/GrossAnatomy/GA.html– An excellent site with many slides, dissections, tutorials, etc.
for study of human anatomy.
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Web SitesWeb SitesWheeless' Textbook of Orthopaedics
www.ortho-u.net/– This site has an extensive index of links to the fractures,
joints, muscles, nerves, trauma, medications, medical topics, lab tests as well as links to orthopaedic journals, other orthopaedic, and medical news.
Premiere Medical Search Enginewww.medsite.com– This site allows the reader to enter any medical condition and
it will search the net to find relevant articles.Arthroscopy.Com
www.arthroscopy.com/sports.htm– Patient information on various musculoskeletal problems of
the upper and lower extremity.
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Web SitesWeb SitesVirtual Hospital
www.vh.org– Numerous slides, patient information, etc.
The Dynamic Human version 2.0 CD-ROM: The Visual Guide to Anatomy & Physiology
www.mhhe.com/biosci/ap/dynamichuman2/– Web site that accompanies this CD-ROM