Unit 5 - Lower Limb: Deep Intrinsic Muscles of Sole of Foot (Ex. IV) Flashcards
lumbricals (4)
O: M borders of flexor digitorum longus tendons
I: dorsal aponeuroses of toes 2-5
Inn: 1st lumbrical - M plantar n. (S2, S3); 2nd-4th lumbricals - L plantar n. (S2, S3)
A: flex MTPs of toes 2-5; extend IPs of toes 2-5; adduct toes 2-5 toward big toe
flexor hallucis brevis
O: cuboid; L cuneiform; plantar calcaneocuboid ligament
I: base of proximal phalanx of 1st toe via M and L sesamoids
Inn: M head - M plantar n. (S1, S2); L head - L plantar n. (S1, S2)
A: flex 1st MTP; supports longitudinal arch
adductor hallucis
O: oblique head - bases of metatarsals 2-4; transverse head - MTPs of toes 3-5 and deep transverse metatarsal ligament
I: base of 1st proximal phalanx by a common tendon via L sesamoid
Inn: deep branch of L plantar n. (S2, S3)
A: flexes 1st MTP; adducts big toe; transverse head - supports transverse arch; oblique head - supports longitudinal arch
flexor digiti minimi brevis
O: base of 5th metatarsal; long plantar ligament
I: base of proximal phalanx of 5th toe
Inn: superficial branch of L plantar n. (S2, S3)
A: flexes MTP of little toe
plantar interossei (3)
O: M borders of metatarsals 3-5
I: M bases of proximal phalanges of toes 3-5
Inn: L plantar n. (S2, S3)
A: flex MTPs of toes 3-5; extend IPs of toes 3-5; adduct toes 3-5 toward 2nd toe
dorsal interossei (4)
O: metatarsals 1-5 via 2 heads on opposing sides
I: 1st interosseous - M base of 2nd proximal phalanx; 2nd-4th interossei - L bases of proximal phalanges 2-4 and dorsal aponeuroses of toes 2-4
Inn: L plantar n. (S2, S3)
A: flex MTPs of toes 2-4; extend IPs of toes 2-4; abduct 3rd and 4th toes from 2nd toe
quadratus plantae
O: M and plantar borders on plantar side of calcaneal tuberosity
I: L border of flexor digitorum longus tendon
Inn: L plantar n. (S1-S3)
A: redirects and augments pull of flexor digitorum longus
