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.
1) If flexes the skin of the palm and thus improves the grip.
2) It protects the underlying tendon, vessels and nerves.
Clinical anatomy: Inflammation involving the ulnar side of the palmar aponeurosis results in Dupuytren’s contracture.