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Flashcards in Hand Deck (20)
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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


 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


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

Flexes thumb at the carpometacarpal joint
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



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