Download - MUSCLES OF THE ANKLE AND FOOT
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Ankle and Foot Muscles• Extrinsic and Intrinsic muscles
• Extrinsic muscles– Anterior muscle cause dorsal flexion– Posterior muscles cause plantar flexion
• Lower leg muscles are divided into 4 compartments
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Lower Leg Compartments
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POSTERIOR MUSCLESPlantar flexion muscles
Posterior muscles
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Gastrocnemius
• Origin: posterior surface of the two femur condyels
• Insertion: posterior surface of the calcaneus via Achilles tendon
• Actions: – plantar flexion of the foot– flexion of the knee
• Stronger plantar flexion when the knee is extended
• Superficial posterior compartment
Posterior
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Soleus
• Located beneath the gastrocnemius
• Origin: upper 2/3 of the posterior surfaces of the tibia and fibula
• Insertion: posterior surface of the calcaneus via Achilles tendon
• Action:
– plantar flexion
• Superficial posterior compartment
Posterior
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Gastrocnemius & Soleus
•Gastronemius and Soleus = “triceps surae” due to their three heads
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Achilles
• Encyclopedia Britannica• In Greek mythology, Achilles was
the bravest and strongest of the Greek warriors in the Trojan War.
• Because his mother dipped him into the River Styx, he was invulnerable except at the heel by which she held him.
• During the war against Troy Achilles took 12 nearby cities, but after a quarrel with Agamemnon he refused further service.
• He allowed his beloved cousin Patroclus to fight in his armor, and when Hector slew Patroclus, Achilles returned to battle, killed Hector, and dragged his body around the walls of Troy.
• Homer mentions Achilles' funeral but not the circumstances of his death; the later poet Arctinus relates that Paris killed Achilles with an arrow guided by Apollo.
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Achilles Tendon
• Named after Achilles• Largest tendon• 1000 pounds of force• Tendon of the
Gastrocnemius and Soleus
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Plantaris
• Absent in some humans• Origin: lateral epicondyle• Insertion: calcaneus• Actions:
– plantar flexion• Superficial posterior
compartment
Posterior
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Posterior versus Anterior
Plantar flexion
Dorsi flexion
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Tibialis posterior
• Origin: posterior surface of the upper half of the adjacent surface of tibia & fibula
• Insertion: navicular, cuneiforms, and cuboid bones and bases of the 2nd-5th metatarsal bones.
• Note: passes posterior to medial malleolus.
• Actions: – plantar flexion – inversion of the foot
• Deep posterior compartment• Medial
Posterior
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Flexor Digitorum Longus
• Origin: middle 1/3 of the posterior surface of the tibia
• Insertion: base of the distal phalanges of each of lateral four toes
• Note: passes posterior to medial malleolus.• Actions:
– toe flexion– plantar flexion,– inversion of the foot
• Maintains the longitudinal arch• Deep posterior compartment• Medial
Posterior
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Flexor Hallicus Longus
• Origin: middle half of the posterior surface of the fibula
• Insertion: distal phalanx of the large toe, plantar surface
• Note: passes posterior to medial malleolus.• Actions:
– Flexion of the great toe– Inversion– Plantar flexion
• Deep posterior compartment• Medial
Posterior
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Tom
Dick
Harry
Plantar flexion
Medial Ankle
medial malleolus.
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Medial Ankle
Medial: InversionPosterior: Toe Flexion and Plantar FlexionAnterior: Toe Extension and Dorsal flexion
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ANTERIOR MUSCLES
Dorsiflexion muscles
Anterior muscles
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Tibialis anterior
• Origin: upper 2/3 of the anterior surface of the tibia
• Insertion: medial cuneform and the first metatarsal
• Note: passes anterior to medial malleolus.
• Actions:– Dorsal flexion– Inversion.
• Anterior compartment
Anterior
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Extensor digitorum longus
• Origin: lateral condyle of the tibia and anterior surface of the fibula
• Insertion: middle and distal phalanges of the four lateral toes.
• Note: passes anterior to lateral malleolus.• Actions:
– Toe extension– Dorsiflexion– Eversion
• Anterior compartment
Anterior
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Extensor hallicus longus
• Origin: middle 2/3 of the inner surface of the front of the fibula
• Insertion: top of the distal phalanx of the great toe
• Note: passes anterior • Actions:
– Extension of big toe– Dorsiflexion– Weak inversion of the foot
• Anterior compartment
Anterior
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Peroneous tertius
• Origin: lower fibula• Insertion: dorsal surface of the 5th
metatarsal• Note: passes anterior to lateral
malleolus.• Action:
– Dorsiflexion– Eversion
• Anterior compartment
Anterior
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Peroneus longus muscle• Origin: head and upper 2/3 of the outer
surface of the fibula• Insertion: undersurfaces of the 1st
cuneiform and first metatarsal bones• Note: passes posterior to lateral malleolus.• Actions:
– Eversion– Plantar flexion
• The tendon goes under the foot from the lateral to the medial surface, thus aiding in support for the transverse arch.
• Lateral compartment
Lateral
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Peroneus brevis muscle
• Origin: lower 2/3 of the outer surface of the fibula
• Insertion: dorsal surface of the 5th metatarsal
• Note: passes posterior to lateral malleolus.
• Actions: – Plantar flexion– Eversion
• Anterior compartment
Lateral
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Muscle Compartments
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Muscle Compartments
• Lower leg has four compartments each surrounded by fascia (facilitates venous return)
• Anterior Compartment (Dorsal flexors)– Tibialis anterior– Peroneous tertius– Ext. dig. Longus– Ext. hallicus
• Lateral Compartment (Evertors)– Peroneus longus– Peroneus brevis
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Muscle Compartments
• Deep Posterior Compartment (Plantar Flexors)– Flexor digitorum longus– Flexor hallicus– Tibialis Posterior
• Superficial Posterior Compartment(Plantar Flexors)– Gastrocnemius– Soleus– Plantaris
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Ankle and Foot Muscles
• Superficial Posterior Compartment– Gastrocnemius– Soleus– Plantaris
• Deep Posterior Compartment– Flexor digitorum longus– Flexor hallicus– Tibialis Posterior
• Lateral Compartment (Evertors)– Peroneus longus– Peroneus brevis
• Anterior Compartment (Dorsal flexors)– Tibialis anterior– Peroneous tertius– Ext. dig. Longus– Ext. hallicus
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IV. Ligaments
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Lateral Ligaments ("T" shaped)
• Anterior talofibular (weakest and most frequently injured)
• Calcaneofibular (strongest of the three ligaments)
• Posterior talofibular
Lateral
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Lateral Ligaments
Lateral
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The Deltoid Ligament
• Deltoid ligament is a combination of:– Anterior talotibial– Tibionavicular– Tibiocalcaneal– Posterior talotibial
Medial
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REVIEW SLIDES
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• Name the landmark
Lateral Malleolus
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Name the muscle and its actions
• Flexor digitorum longus• Actions:
– toe flexion– plantar flexion,– inversion of the foot
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• Name the landmark
Lateral Malleolus
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Name the muscle and its actions• Flexor hallicus longus• Actions:
– Flexion of the big toe– Plantar flexion– Inversion
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1.
2.
3.
4.
1?Talus
2? Navicular
3?1st Cuneform
4?Calcaneous
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Name the muscle and its actions• Tibialis anterior• Actions:
– Dorsiflexion– Inversion.
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45
7
3
6
2
11. Phalanges
2. Metatarsals
3. Cuneiforms
4. Navicular
5. Talus
6. Cuboid
7. Calcaneus
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What term refers to the great toe? Hallux
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Name the actions of the ankle to the left and the ankle to the right.
Eversion Inversion
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Name the muscle and its actions
• Peroneus longus muscle• Actions:
– Eversion– Plantar flexion
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Name the actions
Inversion Eversion
? ?
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Name the two movements at the toes
• Toe flexion • Toe extension
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Name the muscle and its actions
• Peroneus brevis • Actions:
– Plantar flexion– Eversion
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1. Name the action
2. Name the action
Dorsi Flexion
Plantar Flexion
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• Plantaris• Action:
– plantar flexion 2
1. Name the muscle and its actions
2. Name the muscle and its actions
1
• Soleus• Action:
– plantar flexion
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• 1 is the…?• Calcaneous• 2 is the…?• Talus• 3 is the…?• Navicular• 4 is the…? • Cuboid• 5 is the…? • First Cuneiform
• 6 is the…? • Second Cuneiform• 7 is the…? • Third Cuneiform• 8 is the…? • First metatarsal• 9 is the…?• Proximal phalange• 10 is the…?• Middle phalange• 11 is the…?• Distal phalange
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Name the muscle and its actions• Tibialis posterior• Actions:
– plantar flexion – inversion of the foot
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• Name the landmark
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Lateral Collateral Ligament
1. Anterior Talofibular
2. Posterior Talofibular
3. Calcanofibular
2
3
1
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Name the muscle and its actions• Peroneous tertius
• Action:
– Dorsiflexion
– Eversion
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Name the action• Plantar flexion
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Name the action• Inversion
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• Name them all1. Calcaneous
2. Talus3. Navicular4. Cuboid
5. First Cuneiform6.Second Cuneiform7.Third Cuneiform
8. Third Metatarsal (and Fifth Metatarsal)
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Name the action at the ankle joint.
• Plantar flexion• Name the action at the
metatarsal phalange joint• Extension or Hyperextension
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Name the muscle and its actions• Plantaris• Action: plantar flexion
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1. Talus
2. Navicular3. Cuboid4. Intermediate (2nd)
cuneiform
5. 3rd metatarsal
6. 4th proximal phalange
7. 2nd middle phalange8. 1st distal phalange
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Lateral Collateral Ligament
1
2
3
Posterior Talofibular Anterior
Talofibular
Calcanofibular
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Name the muscle and its actions
• Extensor digitorum longus
• Actions: – Toe extension– Dorsiflexion– Eversion
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• Middle phalange of the 3rd toe• Proximal phalange of the 1st toe• Distal phalange of the 5th toe
• 2nd Metatarsal
• 1st Cuniform• 2nd Cuniform• 3rd Cuniform• Navicular• Cubiod
• Talus
• Calcanious
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Name the muscle and its actions
• Extensor hallicus longus • Actions:
– Extension of big toe– Dorsiflexion– Inversion of the foot
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Name the landmark
Medial malleolus
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Name the muscle its two actions
• Gastrocnemius• Actions:
– plantar flexion of the foot– flexion of the knee
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Name the ligament.
Deltoid Ligament