Supratrochlear nerve

Supratrochlear nerve (pronunciation: soo-pruh-trohk-lee-ur nerv) is a branch of the ophthalmic division of the trigeminal nerve, which is the fifth cranial nerve. It is a sensory nerve that provides sensation to the skin of the forehead and scalp.

Etymology

The term "Supratrochlear" is derived from the Latin words "supra," meaning above, and "trochlea," referring to a pulley-like structure. The nerve is named so because it passes above the trochlea, a pulley-like loop through which the superior oblique muscle of the eye passes.

Anatomy

The supratrochlear nerve arises from the frontal nerve, the largest branch of the ophthalmic division of the trigeminal nerve. It passes above the pulley of the superior oblique muscle (trochlea) and ascends on the forehead, where it provides sensory innervation to the skin.

Clinical Significance

Damage to the supratrochlear nerve can result in a loss of sensation in the area of the forehead that it supplies. This can occur due to trauma, surgery, or conditions such as neuralgia, a painful disorder of the nerves.

Related Terms

• Trigeminal nerve
• Ophthalmic division
• Frontal nerve
• Superior oblique muscle
• Neuralgia

External links

• Medical encyclopedia article on Supratrochlear nerve
• Wikipedia's article - Supratrochlear nerve

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