Palmar surfaces of digits of hand

The palmar surface of digits of hand (fingers and thumb) is covered by thick, hairless skin, rich in sweat glands. Fibrous septa firmly anchor this skin to the underlying palmar aponeurosis and flexor tendon sheaths. This tight adherence minimizes skin mobility, which is crucial for a strong, stable grip.

Beneath this specialized skin, digital neurovascular bundles run along the sides of each digit. These bundles, containing the proper palmar digital arteries and nerves, are located deep to the superficial fascia and parallel to the flexor tendon sheaths. Within these sheaths, the tendons of the flexor digitorum superficialis and profundus muscles glide, enabling coordinated flexion of the digits.

Sensory innervation to this highly sensitive area is provided by the proper palmar digital nerves, which are branches of the median and ulnar nerves. Proximally, the palmar surface of the digits seamlessly continue with the thenar and hypothenar eminences at the base of the thumb and little finger, respectively.