ANATOMY - Palm Flashcards
what are the muscles in the thenar eminence of the palm?
abductor pollicis brevis
flexor pollicis brevis
opponens pollicis
what is the lateral-most muscle of the thenar eminence of the palm?
abductor pollicis brevis
what are the three muscles of the thenar eminence innervated by?
recurrent branch of the median n.
what is the function of abductor pollicis brevis?
abducts thumb, assists in some rotation of proximal phalanx slightly medially
Flexor pollicis brevis
function?
Flexes thumb at CMC and MCP but NOT IP (that is only flexor pollicis longus)
(does not cross IP joint)
function flexor pollicis longus
flexes thumb at CMC, MCP AND IP joints
crosses the IP joint
opponens pollicis
function
abducts, medially rotates, and flexes metacarpal of thumb (opposition of thumb)
what are the muscles of the hypothenar eminence of the palm?
abductor digiti minimi
flexor digiti minimi brevis
opponens digiti minimi
what nerve innervates the hypothenar eminence of the palm?
deep branch of the ulnar n.
function of abductor digiti minimi
abducts little finger
function of flexor digiti minimi brevis
what joints does it cross? what other muscles flex the fingers?
flexes little finger at MCP
only crosses MCP joint, not PIP or DIP
flexor digitorum superficiales (MCP/DIP)
flexor digitorum profundas (MCP/DIP/PIP)
opponens digiti minimi
function
draws 5th metacarpal forward and rotates it laterally (opposition)
what are the muscles of the adductor compartment?
adductor pollicis
what is the adductor pollicis innervated by?
deep branch of ulnar n.
what 4 intrinsic muscles of the hand act on the thumb?
abductor pollicis brevis
flexor pollicis brevis
opponens pollicis
adductor pollicis
what are the muscles of the midpalmar compartment?
lumbricles
palmar interossei
dorsal interossei
what do the lumbricles connect to?
why do they do?
the sides of the FDP tendons and to the extensor hood
flex the MCPs and extension at the IPs
innervation of the lumbricles?
deep ulnar n. (medial 2)
median n. (lateral 2)
palmar interossei
attachments, function
o: edges of metacarpals
i: proximal phalanges and extensor hood
ADDUCTS 2, 4, 5 fingers
lumbricle salute
dorsal interossei
function
ABDUCT 2, 3, 4
lumbricle salute
DAB
innervation of dorsal interossei muscles?
deep ulnar n.
innervation of palmar interossei muscles
deep ulnar n.
what two arteries make up the superficial palmar arch?
where is this located
superficial branch of the radial a.
ulnar a.
between the deep flexor tendons and palmar aponeurosis
what two arteries make up the deep palmar arch?
deep branch of the ulnar a.
radial a.
Prior to entering tunnel median n. gives off its ________ br.
which supplies _________________________
palmar branch
cutaneous sensation to the skin of the middle palm
the ulnar n. passes over the carpal tunnel and under ______________
and branches into:
Guyon’s canal
deep branch ulnar n. and common/proper digital
what skin does the ulnar n. innervate?
1 and 1/2 fingers (medial) on palm AND dorsum
what muscles of the palm does the deep ulnar n. innervate?
the thenar eminence, the adductor eminence, and 1/2 of the lubricles, the interosseous muscles
what cutaneous innervation comes off from the median n. ?
3 and 1/2 fingers medial AND PALMAR side (not dorsal)
