Intrinsics Muscles of the Foot

Question 1

Abductor Hallucis

Answer 1

O:
Flexor Retinaculum
Medial Process of Calcaneal Tuberosity
Plantar Aponeurosis

I:
Tibial side of the base of the proximal phalanx of great toe

In:
Medial Plantar nerve (branch of tibial)

F:
Abducts digit 1

Question 2

Flexor Digitorum Brevis

Answer 2

O:
Medial process of the calcaneal tuberosity, calcaneal aponeurosis

I:
Lateral surfaces of middle phalanx of digits 2-5

In:
Medial plantar nerve (branch of tibial)

F:
Flexes digits 2-5

Question 3

Abductor Digiti Minimi

Answer 3

O:
Lateral process of calcaneal tuberosity and plantar aponeurosis

I:
Lateral fibular side of the prox phalanx for the fifth digit

In:
Lateral plantar nerve (branch of the tibial)

F:
Abducts and flexes the fifth digit

Question 4

Quadratus Plantae

Answer 4

O:
2 slips via medial and lateral sides of calcaneus

I:
2 portions join and end in flattened band at the tendon of flexor digitorum longus

In:
Tibial nerve, lateral plantar branch

F:
Works with flexor digitorum longus to flex toes

Question 5

4 Lumbricals

Answer 5

O:
Tendons of flexor digitorum longus

I:
Dorsal surface of proximal phalanges
Expansion of extensor digitorum longus

In:
1st by medial plantar nerve
2nd, 3rd, 4th lumbricals by lateral plantar nerve

F:
Flexes MTP joints
Extends PIP joints and DIP joints

Question 6

Flexor Hallucis Brevis

Answer 6

O:
Plantar surface of the lateral cuneiform and cuboid bones

I:
2 tendons into the base proximal phalanx of the great toe

In:
Medial Plantar nerve

F:
Flexes MTP of digit 1

Question 7

Adductor Hallucis

Answer 7

O:
Oblique head: 2nd, 3rd and 4th metatarsals, sheath of peroneus longus

Transverse: Plantar MTP ligaments of 3rd, 4th 5th digit joints

I:
Oblique: Base of proximal phalanx of digit 1 on the lateral side

Transverse: Lateral side of digit 1

In:
Lateral Plantar nerve

F:
Oblique and Transverse: Adducts digit 1

Question 8

Flexor Digitorum Minimi Brevis

Answer 8

O:
Base of the fifth metatarsal bone, sheath of peroneus longus

I:
Lateral side of base of the 1st phalanx of the fifth toe

In:
Superficial branch of the lateral plantar nerve

F:
Flexes MTP joint of the fifth toe

Question 9

3 Plantar Interossei

Answer 9

O:
Bases and medial sides of the metatarsals of the 3rd, 4th 5th digits

I:
Bases of proximal phalanx of 3rd, 4th, 5th digits

In:
Lateral plantar nerve

F:
Adducts 3rd, 4th, 5th digits
Flexes MTPs
Extends PIP and DIPs

Question 10

4 Dorsal Interossei

Answer 10

O:
Adjacent sides of the 2 metatarsal bones between which it is located

I:
Bases of the first phalanges of the 2nd, 3rd, 4th toes
Aponeurosis of the tendons of extensor digitorum longus

In:
Lateral plantar nerve

F:
Flexes MTP
Extends PIP and DIP