Deep Muscles of Anterior Arm

Question 0

Flexor Digitorum Profundis

Answer 0

Origin: Ulna and Interosseous Membrane
Insertion: Distal Phalanges of Digits 2-5; each tendon passes through bifurcation of the flexor digitorum superficialis tendons
Action: Flexes Hand at Wrist and All Phalanges at 2-5 (MP, PIP, and DIP)
Nerve: Median (via Anterior Interosseous Branch) to Lateral Half of Muscle, Ulnar to Median Half

Question 1

Flexor Pollicis Longis

Answer 1

Origin: Radius and Interosseous Membrane
Insertion: Distal Phalanx of Thumb
Action: Flexes Metacarpophalangeal Joint and and Interphalangeal Joint at the Thumb
Nerve: Median (via anterior interosseous branch)

Question 2

Pronator Quadratus

Answer 2

Origin: Anterior Surface of Distal Ulna
Insertion: Anterior Surface of Distal Radius
Action: Pronates Hand by Pronating Forearm
Nerve: Median (via Anterior Interosseous Branch)