Submentalis

Geniohyoid

Hyoglossus

Mylohyoid

Masseter

Temporalis

DepressorMandibulae

CutaneousPectoralis

Sterno-radialis Deltoid

AnteriorPectoralis

MiddlePectoralis

PosteriorPectoralis

ExternalOblique

RectusAbdominis

Transversus

LatissimusDorsi

DorsalisScapulae

LongissimusDorsi

Coccygeo-iliacus

Ilio-lumbaris

Coccygeo-sacralis

Gluteus

Muscles of the Floor of the Mouth & Tongue

Origin Insertion Action

Mylohyoidinner side of the lower jaw

tendon in median lineraises the floor of the mouth for breathing

Submentalisanterior end of the mandible

tendon in mid-linepushes sublingual tubercle on lower jaw

Geniohyoiddorsally on coracoids and clavicle

Ventral side of the hyoid bulges hyoid ventrally

Hyoglossus hyoid tongueretracts/withdraws tongue forward

Depressor MandibulaePosterior edge of the tympanic ring via dorsal fascia

posterior-most end of the lower jaw

opens the mouth

Temporalisside of the skull between eye and tympanic ring

near posterior end of the lower jaw

closes the mouth

Massetertympanic ring and adjacent bones

lower jaw, behind temporal

closes the mouth

Pterygoideuspterygoid region of the skull

medial side of the condyle of the mandible

assists in jaw movement

Muscles of the Pectoral Girdle, Shoulders, &

ArmsOrigin Insertion Action

AnteriorPectoralis(PectoralisEpicoracoidea)

coracoid and epicoracoid bones

anterior end of the humerus

draws arms towards the chest/adduction of arms

Middle Pectoralis(PectoralisSternalis)

xiphisternumanterior end of the humerus

draws arms towards the chest

Posterior Pectoralis(PectoralisAbdominis)

anterior half of the rectus abdominis

anterior end of the humerus

draws arms towards the chest

Deltoidclavicle, scapula, and omosternum

deltoid crest of the humerus

draws arms forward

Sterno-radialis episternumproximal part of the radius by tendon

flexes forearm and the humerus

Abdominal Wall Muscles

Origin Insertion Action

External Oblique dorsal fascialinea alba dorsal to the previous muscle

compressor of the abdomen and respiratory muscle

Rectus Abdominis pubisdorsally on sternum & coracoid

supports the abdomen, holds the sternum

Transversustransverse process of the 4th to 9th vertebrae & the iliac bone

coracoid &xiphisternumcompressor of the abdomen and respiratory muscle

Back & Pelvic Girdle Muscles

Origin Insertion Action

Dorsalis Scapulae scapulatendon joining the latissimusdorsi

raises arms towards body

LatissimusDorsi dorsal fascia on deltoid crest raises arm dorsally

LongissimusDorsi urostylevertebrae & the back of the skull

straightens the back and raises the head

Ilio-lumbaris anterior end of the iliumtransverse process of the sacral vertebra

extensor of the back

Coccygeo-sacralis periphery of the urostyletransverse process of the 9th sacral vertebra

singly turns the back and raises it

Coccygeo-iliacus periphery of the urostyle anterior part of the ilium holds urostyle in place

Gluteusmiddle of the lateral surface of the ilium

anterior side of head of femur

draws thigh forward & upward

Pyriformisanterior surface of lateral sacrum

greater trochanter of femur, along its medial surface

laterally rotates thigh at hip, also abducts thigh if hip is flexed

Thigh Muscles Origin Insertion ActionTriceps Femoris pelvic girdle front of the tibia extensor of the shank

Biceps Femoriscrest of the ilium above the acetabulum

distal part of the femur and posterior border of the tibio-fibula

Adducts the thigh against the trunk, also extend to the shank

Semimembranosus dorsal side of the ischiumposterior end of the tibio-fibula

flexes of the shank

Gracilis Muscles edge of the ischiuminner side of the tibio-fibula below the head

flexes shank

Semitendinosus ischium by two headswith the gracilis minor on the proximal end of the tibio-fibula

adducts thigh & flexes the shank

Adductor Muscles ischium and pubis distal end of the femur adducts thigh and leg

Sartorius lower end of iliumproximal end of the tibio-fibula

flexor of the thigh

Shank Muscles Origin Insertion Action

Gastrocnemiusdistal end of the femur by a flat tendon, & edge of knee tendon

tendon of Achillesextends the foot and flexes the shank

Peroneus knee tendontibio-fibula, distally by ankle

draws shank against the thigh and extends or twist the foot

TibialisAnticus femur calcaneal bone extensor of the footTibialisPosticus femur calcaneal bone extensor of the foot