Muscles of the Anterior Forearm - Deep Layer

Question 1

Flexor Digitorum Profundus (lateral two sections)

Answer 1

origin: radius, ulna and interosseous membrane
insertion: distal phalanges of digits 2-5
innervation: anterior interosseous nerve
action: flexion of the digits 2-5 at the MP, PIP and DIP joints

Question 2

Flexor Digitorum Profundus (medial two sections)

Answer 2

origin: radius, ulna and interosseous membrane
insertion: distal phalanges of digits 2-5
innervation: ulnar nerve
action: flexion of the digits 2-5 at the MP, PIP and DIP joints

Question 3

Flexor Pollicis Longus

Answer 3

origin: radius, ulna and interosseous membrane
insertion: distal phalanx of digit 1
innervation: anterior interosseous nerve
action: flexion of the thumb

Question 4

Pronator Quadratus

Answer 4

origin: distal ulna
insertion: distal radius
innervation: anterior interosseous nerve
action: pronation