Palmar
aponeurosis
Definition:
This is the thickened deep fascia of the central part of the palm.
Features:
It is triangular in shape
1)
Apex: It blendsproximally with the
flexor retinaculum and is continuous with the tendon of palmaris longus.
2)
Base: It is directed distally, it
divides into four slips near the head of metacarpals of middle four fingers.
Each slips divides into
two parts and becoms continuous with the fibrous flexor sheaths
.
Extension:
Pass to the deep transverse ligaments, capsule the metacarpophlangeal joints
& the sides of the base of the proximal phalanx.
Function:
1)
If flexes the skin of the palm and thus
improves the grip.
2)
It protects the underlying tendon,
vessels and nerves.
Cinical
anatomy: Inflammaiton involving the ulnar side
of the palmar aponeurosis results in Dupuytren’s contracture.
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