Hand Flashcards
what is its clinical importance?
Flexor Retinaculum
compresses the tibial nerve in tarpal tunnel and compresses median nerve in carpal tunnel
supericial branch of Ulnar Nerve
(C8,T1)
palmaris brevis and the skin on the ulnar side of the hand, and divides into a common palmar digital nerve and a proper palmar digital nerve.
The proper digital branches are distributed to the fingers in the same manner as those of the median nerve.
Deep Branch of the Ulnar nerve
As it crosses the deep part of the hand, it supplies all the interosseous muscles and the third and fourth lumbricals.
It ends by supplying the adductor pollicis and the medial (deep) head of the flexor pollicis brevis.
Superficial Branch of the Ulnar Artery (forms mostly the superficial arch) which gives rise to palmar and metacarpal arteries
if this is the deep branch of the ulnar artery what does it anatomose with? what does it form
The radial artery ends by anastomosing with the deep branch of the
ulnar artery to form: the deep palmar arch, which is mainly formed by the radial
artery
What is this? is it involved in carpal tunnel?
Lumbrical Muscles
. In the carpal tunnel syndrome, the lumbricals are
often normal because, in the carpal tunnel, fibers that innervate the lumbricals lie more posteriorly
than those to the thenar muscles, protecting the lumbrical motor fibers from compression.
recurrent branch in the Median Nerve
innervation to opponens pollicis, abductor pollicis brevis and flexor pollicis brevis
the million dollar nerve
what is its clinical signiciance
abductor Pollicis Brevis
Paresis and atrophy of the
• abductor pollicis brevis and
• opponens pollicis muscles are present in CARPEL TUNNEL SYNDROME
Insertion: Proximal phalanx of the thumb (base-lateral)
Innervation: Median nerve
Action: Abducts thumb at the metacarpophalangeal joint
Helps opposition
Flexor Pollicis Brevis
lateral to the abductor pollicis brevis
Insertion: Proximal phalanx of the thumb (base-medial)
Innervation: -superficial head - Median nerve
- deep head -Ulnar nerve
Action:
Flexes thumb at the carpometacarpal joint
(strong)
and metacarpophalangeal joint (weak)
Opponens Pollicis
deep to the abductor and flexor pollicis brevis
Insertion: First metacarpal (lateral)
Innervation: Median nerve
Adductor Pollicis Muscle
beneath the long flexor tendons and the lumbrical muscles at the center of the palm.
Insertion: Proximal phalanx of thumb (base-medial)
Innervation: Ulnar nerve
Action: Adducts thumb at the metacarpophalangeal joint
Abductor Digiti Minimi Muscle lateral to the flexor digiti minimi
Insertion: Proximal phalanx of 5th digit
Innervation: ulnar nerve
OPPONENS DIGITI MINIMI
Flexor retinaculum
Insertion: 5
th metacarpal
Innervation: ulnar nerve
- dorsal interossei (4) – adjacent
sides of two metacarpals
Innervation: Ulnar nerve
ABDUCTS the digits (this is in relation to the middle finger)
Thus there are dorsal interossei attached only to index, middle and ring fingers.
In the case of index and ring fingers they are inserted into the side of the finger away from the middle finger. In the case of the middle finger itself a dorsal interosseous is present on each side.
palmar interosseous muscle
palmar interossei - adducts the digits
innervated by ULNAR nerve
attaches palmar
surfaces of 2nd, 4th,and 5th
metacarpals TOWARDS the middle finger. think PT (since I need PT since my back hurts right now)
Dorsal Interosseous Muscles as seen on the palmer surface
DAB (dorsal ABDUcts and is attached AWAY from middle finger)
Deep Palmar Arch
It is usually formed mainly from the terminal part of the radial artery, with the ulnar artery contributing via its deep palmar branch (unlike superficial palmer branch which is mostly ulnar artery)
proximal to the superficial palmer arch
opponens pollicis
reccurent branch of median nerve
abductor pollicis brevis
adductor pollicis
deep branch of ulnar nerve
