Infratrochlear nerve

Infobox Nerve
Name = PAGENAME
Latin = nervus infratrochlearis
GraySubject = 200
GrayPage = 888

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Caption = Sensory areas of the head, showing the general distribution of the three divisions of the fifth nerve. (Infratrochlear nerve labeled at center left.)

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Caption2 = Nerves of the orbit, and the ciliary ganglion. Side view.
Innervates =
BranchFrom = Nasociliary nerve
BranchTo =
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MeshNumber =
DorlandsPre = n_05
DorlandsSuf = 12565921
The infratrochlear nerve is given off from the nasociliary just before it enters the anterior ethmoidal foramen.

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 angle of the eye, and supplies the skin of the eyelids and side of the nose, the conjunctiva, lacrimal sac, and caruncle.

Etymology

"Infratrochlear" means "below the trochlea". The term "trochlea" means "pulley" in Latin. Specifically, the trochlea referred to is a loop inside the orbit of the eye (trochlea of superior oblique), through which the tendon of the superior oblique muscle passes.

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External links

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* (NormanAnatomyFig|V)