Difference between the palmar Interossei & dorsal interossei muscles of the hand
Difference
between the palmar Interossei &
dorsal interossei muscles of the hand
Palmar interossei
|
Dorsal interossei
|
|
Character
|
Uni-pennate
|
Bi-pennete
|
Size
|
Smaller
than the dorsal interossei
|
Larger
than the palmar interossei
|
Origin
|
by single head-from one
side of the the body of the palmar surface of metacarpal bones
|
By two heads; from the
adjacent sides the bodies of all metacarpal bones
|
View
|
They are only seen from the
palmar aspect of the interosseous space
|
Dorsal interossei can be
seen from both dorsal and palmar aspects
|
Action
|
Abduction-Carry
the fingers or toes towards the middle line
PAD
:
P
: palmar interossei
AD
: adduction
|
Abduction; carry the
fingers or toes away from the middle line
DAB:
D: dorsal interossei
AB: abduction
|
Special note
|
Thumb require no Palmaris
interossei thumb already possessing its own powerful adduction by adductor
pollicis : one of the thenar muscle
|
Abduction of Thumb and
little finger are done by abductor pollicis brevis of thenar muscle
And abductor digiti minimi
of little finger .
|
Vascular supply
|
Branch of deep palmar arch,
Pronceps pollicis artery,
radialis indicis artery. Palmar metacarpal artery
Proximal and distal
perforating arteries and common and proper digital (palmar ) arteries
|
Dorsal metacarpal a (1st
-4th )
Palmar metacarpal a(2nd
to 4th )
Radial a (1st),Princeps
pollicis a, Radialis indicis a,Three perforating branch from deep palmar arch
&three distal perforating branches.The tendons are supply by branch from
common &proper palmar digital a and the dorsal digital a
|