KN 252 Lecture Notes - Lecture 4: Flexor Digitorum Profundus Muscle, Flexor Pollicis Longus Muscle, Flexor Digitorum Superficialis Muscle
Document Summary
Superficial muscles of the anterior forearm and hand. Palmaris longus: origin: medial epicondyle of humerus, insertion: palmar aponeurosis of head, innervation: median nerve, action: flexes wrist joint; opposes shearing forces on the skin of the palm during gripping. Flexor carpi radialis tendon is positioned lateral to midline and can be palpated: origin: medial epicondyle of humerus, insertion: base of metacarpals ii and iii (anterior surfaces, innervation: median nerve, action: flexes and abducts the wrist. The tendons split into two parts to pass dorsally around tendon of flexor digitorum profundus: innervation: median nerve, action: flexes proximal interphalangeal joints of index, middle, ring, and little fingers. Deep muscles of the anterior forearm and hand. Flexes metacarpophalangeal joints of same fingers and wrist joint. Pronator quadratus it is deep to & crossed by tendons of flexor digitorum profundus/flexor pollicis longus: origin: linear ridge on distal anterior surface of ulna, insertion: distal anterior surface of radius, innervation: median nerve, action: pronation.
