Deep Plantar Foot Muslces

Question 1

Layer 3 muscles

Answer 1

Flexor digiti minimi brevis
Adductor hallucis
Flexor hallucis brevis

Question 2

Layer 4 muscles

Answer 2

Bipennate dorsal interossei

Unipennate plantar interossei

Question 3

Flexor digiti minimi brevis

Answer 3

• Originates on the base of the fifth metatarsal
• Inserts on the base of the proximal phalanx of digit 5
• Flexes digit 5

Question 4

Adductor hallucis - 2 heads

Answer 4

• The oblique head originates on the bases of metatarsals 2-4;
• The transverse head originates on the metatarsophalangeal joints of toes 2-5.
• Both heads insert on the proximal phalanx of the big toe.
• Adducts the big toe

Question 5

Flexor hallucis brevis

Answer 5

• Originates on the cuboid and third cuneiform
• Insert on the proximal phalanx of the big toe.
• Flexes digit 1.

Question 6

Bipennate dorsal interossei

Answer 6

• First dorsal interosseous arises from the sides of metatarsals I and II and inserts on the medial side of the proximal
phalanx of digit 2.
• Second dorsal interosseous arises from the sides of metatarsals II and III, and inserts on the lateral side of the
proximal phalanx of digit 2.
• Third dorsal interosseous arises from the sides of metatarsals III and IV and inserts on the lateral side of the proximal
phalanx of digit 3.
• The fourth dorsal interosseous arises from the sides of metatarsals IV and V, and inserts on the lateral side of the
proximal phalanx of digit 4.
• Dorsal interossei abduct the toes (in relation to digit 2).

Question 7

Unipennate plantar inerossei

Answer 7

• All three plantar interossei arise from the medial sides of metatarsals III-V and insert on the medial sides of the
proximal phalanges of digits 3-5.

• Plantar interossei adduct the toes (in relation to digit 2).