Superficial transverse metacarpal ligament

The superficial transverse metacarpal ligaments are thin, transverse fibrous bands located in the distal palm, immediately proximal to the digital web spaces. These ligaments are formed by condensations of the superficial layer of the palmar aponeurosis, which itself is a distal specialization of the antebrachial fascia. These superficial ligaments are continuous with the longitudinal fibers of the palmar aponeurosis, primarily serving to stabilize the palmar skin and digital web spaces.

Distinguishing superficial from deep transverse metacarpal ligaments

It is important to differentiate the superficial transverse metacarpal ligaments from the deep transverse metacarpal ligaments. The latter are robust bands situated at a deeper plane within the hand. They directly connect the palmar aspects of the heads of the second through fifth metacarpal bones, with their essential role being to maintain the transverse stability of the metacarpal arch and ensure the proper alignment of the metacarpal heads.