Palmar branch of the median nerve

Palmar branch of the median nerve is a nerve in the human body that originates from the median nerve, which is one of the main nerves in the arm. The palmar branch of the median nerve provides sensory innervation to the skin of the central palm.

Etymology

The term "palmar" is derived from the Latin word "palma", which means palm of the hand. The term "branch" in this context refers to a part of a complex structure, such as a nerve, that divides into smaller parts. The term "median" is derived from the Latin word "medianus", which means situated in the middle. The term "nerve" is derived from the Latin word "nervus", which means sinew or string.

Anatomy

The palmar branch of the median nerve arises in the distal forearm, just above the flexor retinaculum. It then passes superficial to the flexor retinaculum and provides sensory innervation to the skin of the central palm. The nerve does not innervate the digits, which are innervated by the common palmar digital nerves, also branches of the median nerve.

Clinical significance

Damage to the palmar branch of the median nerve can result in loss of sensation in the central palm. This can occur as a result of trauma, such as a fracture of the forearm, or due to compression of the nerve, such as in carpal tunnel syndrome. In carpal tunnel syndrome, the median nerve is compressed at the level of the wrist, which can result in symptoms in the hand. However, because the palmar branch of the median nerve passes over the carpal tunnel, it is often spared in carpal tunnel syndrome, preserving sensation in the central palm.

Related terms

• Median nerve
• Distal forearm
• Flexor retinaculum
• Carpal tunnel syndrome
• Common palmar digital nerves

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