Intermediate (second) layer

Question 1

What is the proximal attachment of flexor digitorum superficialis (FDS)?

Answer 1

humero-ulnar head: medial epicondyle of humerus and coronoid process of ulna
radial head: oblique line of radius

Question 2

What is the distal attachment of flexor digitorum superficialis?

Answer 2

shafts (bodies) of middle phalanges of medial 4 digits

Question 3

What innervates flexor digitorum superficialis?

Answer 3

median nerve (C7, C8, T1)

Question 4

What are the main actions of flexor digitorum superficialis?

Answer 4

flexes proximal interphalangeal joints of middle four digits; acting more strongly, it also flexes proximal phalanges at metacarpophalangeal joints