Foot intrinsic Muscles Flashcards
Flexor digitorum brevis
O: medial process of tuberosity of calcaneus; plantar aponeurosis
I: middle phalanx of 2nd-5th toes
A: flexes the PIP joints; assists in flexion of 2nd-5th MTP joints
In: medial plantar nerve S1-2
Art: medial plantar artery from the posterior tibial artery
Abductor hallucis
O: medial process of tuberosity of calcaneus; plantar aperneurosis
I: medial side of base of proximal phalanx of 1st toe
A: abducts 1st toe; helps with 1st toe flexion
In: medial plantar nerve S1-2
Art: medial plantar artery from the posterior tibial artery
Abductor digiti minimi
O: medial and lateral process of tuberosity of calcaneus; plantar aponeurosis
I: lateral side of base of proximal phalanx of 5th toe
A: abducts and flexes 5th toe
In: lateral plantar nerve S1-3
Art: lateral plantar artery from the posterior tibial artery
Quadratus plantae
O: medial-middle surface of calcaneus ; lateral- lateral border of plantar surface of calcaneus
I: lateral margin, dorsal and plantar surface of tendon of FDL
A: modified line of pull of FDL; assists in flexion of 2nd-5th toes
In: lateral plantar nerve S1-3
Art: posterior tibial artery
Lumbricals
O: (1) medial side of 1st FDL tendon
(2) adjacent sides of 1st and 2nd FDL tendons
(3) adjacent sides of 2nd and 3rd FDL tendons
(4) adjacent sides of 3rd and 4th FDL tendons
I: medial side of proximal phalanx and dorsal expansion of 2nd-5th EDL tendons
A: flexes 2nd-5th MTP joints, assists in extension of 2nd-5th IP joints
In: (1) medial plantar nerve S1-2; (2-4)- lateral plantar nerve S2-3
Art: medial and lateral plantar artery from the posterior tibial artery
Flexor hallucis brevis
O: medial plantar surface of cuboid; adjacent lateral cuneiform
I: medial lateral surface of base of proximal phalanx, sesamoids
A: flexion of 1st toe
In: medial plantar nerve S1-2
Art: posterior tibial artery
Adductor hallucis
O: oblique head: base of metatarsals; transverse head: plantar 2nd-4th MTP ligaments of 3rd-5th toes
I: lateral side of base of proximal phalanx of 1st to
A: addicts 1st toe, helps with 1st toe flexion
In: lateral plantar nerve S2-3
Art: lateral plantar artery from the posterior tibial artery
Flexor digiti minimi
O: medial plantar surface of base of 5th MT, sheath of peroneus longus
I: lateral base of proximal phalanx of 5th toe
A: flexes MTP of 5th toe
In: lateral plantar nerve S1-3
Art: posterior tibial artery
Dorsal interossei (4)
O: two heads attach to adjacent sides of Mt bones
I: sides of the proximal phalanx, capsule of MTP joint, (1)- medial side of 2nd toe, (2-4)- lateral sides of 2nd-4th toes
A: abducts 2nd-4th toes, assists in 2nd-4th MTP joint flexion
In: lateral plantar nerve S2-3
Art: lateral plantar artery from the posterior tibial artery
Plantar interossei (3)
O: medial bases of 3rd-5th MT bones I: medial bases of 3rd-5th phalanges A: adducts 3rd-5th toes, assists in 3rd-5th MTP flexion In: lateral plantar nerve S2-3 Art: posterior tibial artery
Extensor hallicus brevis
O: distal part of superior and lateral surfaces of calcaneus
I: dorsal surface of base of proximal phalanx of 1st toe
A: extends MTP joint of 1st toe
In: deep peroneal nerve L5-S1
Art: dorsalis pedis artery
Extensor digitorum brevis
O: distal part of superior and lateral surfaces of calcaneus
I: joint lateral side of EDL tendon to 2nd-4th toes
A: extends 2nd-4th MTP joints, assists in the extension of the 2nd-4th IP joints
In: deep peroneal nerve L5-S1
Art: dorsalis pedis artery
