Infratrochlear nerve

The infratrochlear nerve is given off from the nasociliary nerve just before it enters the anterior ethmoidal foramen.

Infratrochlear nerve
Sensory areas of the head, showing the general distribution of the three divisions of the fifth nerve. (Infratrochlear nerve labeled at center left.)
Nerves of the orbit, and the ciliary ganglion. Side view.
FromNasociliary nerve
LatinNervus infratrochlearis
Anatomical terms of neuroanatomy

It runs forward along the upper border of the medial rectus, and is joined, near the pulley of the superior oblique, by a filament from the supratrochlear nerve.

It then passes to the medial commissure of the eye, and supplies the skin of the upper eyelids and bridge of the nose, the conjunctiva, lacrimal sac and caruncle.


Infratrochlear means "below the trochlea". The term trochlea means "pulley" in Latin. Specifically, the trochlea referred to is a bony loop at the inner and upper corner of the eye socket (trochlea of superior oblique), through which the tendon of the superior oblique muscle passes.

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This article incorporates text in the public domain from page 888 of the 20th edition of Gray's Anatomy (1918)

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