Deep intrinsic muscles of the sole (PART 2)

Question 1

Insertion of flexor digiti minimi brevis?

Answer 1

5th toe (base of proximal phalanx)

Question 2

Innervation of flexor digiti minimi brevis?

Answer 2

Lateral plantar n. Superficial branch (S2, S3)

Question 3

Action of flexor digiti minimi brevis?

Answer 3

Flexes the MTP joint of the little toe

Question 4

Origin of Plantar interossei (three muscles)?

Answer 4

3rd to 5th metatarsals (medial border)

Question 5

Insertion of plantar interossei (three muscles)?

Answer 5

3rd to 5th toes (medial base of proximal phalanx)

Question 6

Innervation of plantar interossei (three muscles)?

Answer 6

Lateral plantar n. (S2, S3)

Question 7

Action of plantar interossei?

Answer 7

• Flexes the MTP joints of 3rd to 5th toes
• Extension of IP joints of 3rd to 5th toes
• Adducts 3rd to 5th toes toward 2nd toe

Question 8

Origin of dorsal interossei (four muscles)

Answer 8

1st to 5th metatarsals (by two heads on opposing sides)

Question 9

Insertion of dorsal interossei?

Answer 9

1st interosseous: 2nd proximal phalanx (medial base)

2nd to 4th interossei: 2nd to 4th proximal phalanges (lateral base), 2nd to 4th toes (at dorsal aponeuroses)

Question 10

Innervation of dorsal interossei?

Answer 10

Lateral plantar n. (S2, S3)

Question 11

Action of dorsal interossei?

Answer 11

FLexes the MTP joints of the 2nd to 4th toes
Extension of IP joints of 2nd to 4th toes
Abducts 3rd and 4th toes from 2nd toe

Question 12

Origin of flexor digiti minimi brevis?

Answer 12

5th metatarsal (base), long plantar ligament