Muscles of the Hand Flashcards
Abductor Digiti Minimi innervation
deep branch of the ulnar nerve
C8-T1
Abductor Digiti Minimi attachments
from the pisiform to the ulnar side of the base of the proximal phalanx of the 5th digit
Actions of abductor digiti minimi
abducts the 5th digit
Abductor pollicis brevis innervation
recurrent branch of the median nerve (C6-T1)
Attachments of the abductor pollicis brevis
from the transverse carpal lig. –> the radial side of the base of the proximal phalanx of the thumb and tubercle of trapezium
Action of the abductor pollicis brevis
abducts thumb
Adductor pollicis innervation
deep branch of the ulnar nerve (C8-T1)
Adductor pollicis attachments
from the capitate & 2nd & 3rd metacarpals (oblique head) & the palmar aspect of the 3rd metacarpal (transverse head) —> the base of the proximal phalanx of the thumb
Adductor pollicis actions
adducts thumb
Innervation of the dorsal interossei
deep branch of the ulnar nerve (C8-T1)
Attachments of the dorsal interossei
from the adjacent sides of the metacarpals –> the proximal phalangeal bases & dorsal digital expansions of digits 2-4
Actions of the dorsal interossei
abducts (MCP), flexes (MCP & extends (IP) digits 2-4
innervation of the flexor digiti minimi brevis
(C8-T1)
deep branch of the ulnar nerve
Attachments of the flexor digiti minimi brevis
from the hamate —> the ulnar side of the base of the proximal phalanx of the 5th digit
Actions of the flexor digiti minimi brevis
flexes the MCP (5th digit)
Innervation of the flexor pollicis brevis
superficial head- C6-T1
deep head C8-T1
recurrent brach of the median nerve (superficial head)
deep branch of the ulnar nerve (deep head)
Actions of the flexor pollicis brevis
flexes thumb at the MCP
Attachments of the flexor pollicis brevis
from the transverse carpal lig. & trapezium to the radial side of the base of the proximal phalanx of the thumb
deep head blends with opponens pollicis
Innervation of the lumbricals
deep branch of the ulnar nerve- lumbricals 3 and 4 (C8-T1)
median nerve - lumbricals 1 and 2 (C7-T1)
Attachments of the lumbricals
flexor digitorum profundus tendons–> radial side of the dorsal digital expansions of digits 2-5
Actions of the lumbricals
flexes MCP and extends the IP joints of digits 2-5
Innervation of the opponens digiti minimi
deep branch of the ulnar nerve (C8-T1)
hypothenar
Attachments of the opponens digiti minimi
From the hook of the hamate–> ulnar margin of the shaft of the 5th metacarpal
Actions of the opponens digiti minimi
opposition of the 5th digit to the thumb
Innervation of the opponens pollics
recurrent branch of the median nerve (C6-T1)
thenar eminence
Attachments of the opponens pollicis
transverse carpal ligament and trapezium–> palmar surface of the 1st MC
Actions of the opponens pollicis
opposition of the thumb to the 5th digit
Innervation of the palmar interossei
deep branch of the ulnar nerve (C8-T1)
“PAD”
Attachments of the palmar interossei
from the palmar aspects of metacarpals 2, 4 & 5 to the dorsal digital expansions of digits 2, 4, 5
Actions of the palmar interossei
adduct (MCP), flexes (MCP), and extends (IP) digits 2, 4, 5
