KP221 Lecture 16: KP221 L16_Intrinsic Muscles of the Little Finger

• School: WLU
• Department: Kinesiology & Physical Education
• Course: KP221
• Professor: Michael Cinelli

Document Summary

Kp221 lecture topic 16: origin = pisiform (only visible on anterior view; adm = very anterior/lateral) Insertion = ulnar aspect of base of proximal phalanx. Innervation = ulnar nerve: action = abduction of 5th digit. Flexor digiti minimi brevis: origin = flexor retinaculum and hamulus (hook) of hamate bone. Innervation = ulnar nerve: action = flexion of 5th digit, mostly occurs at metacarpal-phalangeal joint. Opponens digiti minimi: origin = flexor retinaculum and hamulus (hook) of hamate. Insertion = ulnar border of 5th metacarpal shaft. Innervation = ulnar nerve: action = opposition of little finger to thumb (cupping hand to firmly grasp tool, ex. opening a jar. Palmaris brevis: small muscle, origin = medial border of palmar aponeurosis. Insertion = skin on ulnar surface of hand. Innervation = ulnar nerve: action = tenses skin of palm for gripping.