Ankle/Foot muscles Flashcards
Abductor Hallucis
O: Medial tubercle of tuberosity of calcaneus : flexor retinaculum: plantar aponeurosis
I: medial side of base of proximal phalanx of 1st digit
I: Medial plantar Nerve
A: Abductor and flexes 1st digit at metatarsophalangeal and interphalangeal joints
Flexor Digitorum Brevis
O: Medial tubercle of tuberosity of calcaneus: plantar aponeurosis: intermuscular septa
I: Both sides of middle phalanges of lateral four digits
I: Medial Plantar Nerve
A: Flexes lateral four digits at MTP and IP joints
Abductor Digit Minimi
O: Medial and lateral tubercles of tuberosity of calcaneus: plantar aponeurosis: intermuscular septa
I: lateral side of base of proximal phalanx of 5th digit
I: Lateral Plantar Nerve
A: Abducts and flexes little toe at MTP and IP joints
Quadratus Plantae
O: medial surface and lateral margin of plantar surface of calcaneus
I: Posterolateral margin of tendon of flexor digitorum longus
I: Lateral Plantar Nerve
A: Assists flexor digitorum longus in flexing lateral four digits at MTP and IP joints
Lumbricals
O: Tendons of flexor digitorum longus
I: medial aspect of expansion over lateral four digits
I:Medial one= medial plantar nerve
Lateral three=lateral plantar nerve
A: Flexes proximal IP joint: extend middle and distal IP joints of Lateral Four digits
Flexor Hallucis Brevis
O: Plantar surfaces of cuboid and lateral cuneiforms
I: Both sides of base of proximal phalanx of 1st digit
I: Medial Plantar Nerve
A: Flexes proximal interphalangeal joint of 1st digit
Adductor Hallucis
O: Oblique head= bases of metatarsals 2-4
Transverse Head= plantar ligaments of
metatarsophalangeal Joints
I: Tendons of both heads attach to lateral side of base of proximal phalanx of 1st digit
I: Deep branch of lateral plantar nerve
A: traditionally said to adductor 1st digit: assist in maintaining transverse arch of foot by pulling metatarsals medially
Flexor Digiti Minimi Brevis
O: Base of 5th metatarsal
I: base of proximal phalanx of 5th digit
I: superficial branch of lateral plantar nerve
A: Flexes proximal IP joint of 5th digit thereby assisting with flexion of digit
Plantar Interossei
O: Plantar aspect of medial sides of shafts of metatarsals 3-5
I: Medial sides of bases of phalanges of 3rd-5th digits
I: Lateral Plantar Nerve
A: adduct and flex digits 3-5 at MTP Joint
Dorsal Interossei
O: Adjacent sides of shafts of metatarsals 1-5
I: 1st= medial side of proximal phalanx of 2nd digit
2nd-4th= lateral sides of 2nd-4th digits
I: Lateral Plantar Nerve
A: Abduct and flex digits 2-4 at MTP joints
Extensor Digitorum Brevis
O: Calcaneus: interosseous talocalcaneal ligament: stem of inferior extensor retinaculum
I: Long extensor tendons of three intermediate digits 2-4
I: Deep fibular nerve
A: Aids the extensor digitorum longus in extending the three intermediate toes at the metatarsophalangeal and interphalangeal joints
Extensor Hallucis Brevis
O: In common with extensor digitorum brevis
I: Dorsal aspect of base of proximal phalanx of great toes
I: Deep fibular nerve
A: Aids the extensor hallucis longus in extending the great toe at the MTP joint
