Palm layer 3

 

Palmar apponeurosis layer

We have now reached the palmar aponeurosis layer. Removal of the superficial fascia exposes the palmar aponeurosis. It also exposes the flexor retinaculum and the also fibrous flexor sheath, But in this layer we shall see the palmar aponeurosis and structures which surround it. To reach this layer we have removed the superficial fascia, the palmar venous plexus and the proper palmar digital veins. We can now see the palmar aponeurosis, digital nerves and digital vessels. The roof of the hypothenar space has now been removed to expose the structures underlying it. At this stage we can only see two muscles- abductor pollicis brevis and fflexor pollicis  brevis. In the hypothenar space we can only see the abductor digiti minimi. In sum we have exposed the palmar aponeurosis, common digital nerves and vessels, the thenar space which at this stage contains only two muscles- the abductor pollicis brevis and the flexor pollicis  brevis, the ulnar artery and the hypothenar space which contains only one muscle the abductor digiti minimi.

Layer 3 contains the following structures-[Palmar aponeurosis, common digital nerves and vessels, hypothenar space containing abductor pollicis brevis, flexor pollicis  brevis, hypothenar space containing abductor digiti minimi, and ulnar nerve]


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