Intrinsic Foot Muscles

Question 1

Extensor Digitorum Brevis

Answer 1

O: Superolateral surfaces of calcaneus
I: Dorsal surface of distal phalanges of digits 1-4
A: Extension at MTP joints of digits 1-4

Question 2

Abductor Hallucis

Answer 2

O: Calcaneal tuberosity on inferior surface
I: Medial side of proximal phalanx of digit 1
A: Abduction at MTP joint of digit 1, Dorsiflexion of calcaneus

Question 3

Flexor Digitorum Brevis

Answer 3

O: Calcaneal tuberosity on inferior surface
I: Sides of middle phalanges digits 2-5
A: Flexion of IP joint of digits 2-5

Question 4

Abductor Digiti Minimi

Answer 4

O: Calcaneal tuberosity on inferior surfaces, Aponeurosis from lateral and plantar surface of calcaneus
I: Lateral side of base of 5th proximal phalanx
A: Abduction of MTP of digit 5, Flexion of MTP joint of digit 5

Question 5

Quadratus Plantae

Answer 5

O: Calcaneal tuberosity on inferior and medial surfaces
I: Lateral aspect of flexor digitorum longus tendon
A: Flexion at joints of toes 2-5, Dorsiflexion at calcaneus, Medial and longitudinal arch support

Question 6

Lumbricals (4)

Answer 6

O: Sides of flexor digitorum longus tendons
I: Medial aspect of extensor expansion at proximal phalanges
A: Flexion of MTP joints of digits 2-5, Extension at IP joints of digits 2-5

Question 7

Flexor Hallucis Brevis

Answer 7

O: Cuboid, Lateral cuneiform
I: Medial and lateral portions of plantar aspect of proximal phalanx of digit 1
A: Flexion at MTP of digit 1

Question 8

Adductor Hallucis (Oblique Head)

Answer 8

O: Bases of metatarsal bones 2-4, Plantar ligaments
I: Lateral portion of FHB at proximal phalanx of digit 1
A: Adduction at MTP joint of digit 1, Flexion at MTP joint of digit 1

Question 9

Flexor Digiti Minimi Brevis

Answer 9

O: Base of metatarsal bone 5
I: Lateral side of proximal phalanx of digit 5
A: Flexion at MTP joint of digit 5

Question 10

Dorsal Interossei (4)

Answer 10

O: Sides of metatarsal bones, 2 heads from opposing sides of 1-5 metatarsals
I: Medial and lateral sides of toe 2, lateral sides of toes 3 and 4
A: Abduction at MTP joint of digits 3-4, Flexion of MTP joint of digits 2-4, Extension at the IP joint of digits 2-4

Question 11

Plantar Interossei (3)

Answer 11

O: Base and medial sides of metatarsal bones
I: Medial sides of toes 3-5
A: Adduction at MTP joint of digits 3-5, Flexion of MTP joint of digits 3-5, Extension at IP joint of digits 3-5

Question 12

Adductor Hallucis (Transverse Head)

Answer 12

O: Heads of metatarsals digits 3-5
I: Lateral portion of FHB at first proximal phalanx of digit 1
A: Adduction at MTP joint of digit 1, Flexion at MTP joint of digit 1