Infratrochlear nerve

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Nerve: 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.
Latin	nervus infratrochlearis
Gray's	subject #200 888
From	Nasociliary nerve
Dorlands / Elsevier	n_05/12565921

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.

Additional images

Nerves of the orbit. Seen from above.

External links

• MedEd at Loyola GrossAnatomy/h_n/cn/cn1/cnb1.htm
• Norman/Georgetown cranialnerves (V)

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.

v • d • e The cranial nerves: trigeminal nerve
ophthalmic (V1)	frontal: supratrochlear - supraorbital (lateral branch, medial branch) nasociliary: long ciliary - infratrochlear - posterior ethmoidal - anterior ethmoidal (external nasal, internal nasal) - sensory root of ciliary ganglion (ciliary ganglion) lacrimal
maxillary (V2)	in meninges middle meningeal in pterygopalatine fossa zygomatic (zygomaticotemporal, zygomaticofacial) - pterygopalatine (pterygopalatine ganglion see below for details) - posterior superior alveolar in infraorbital canal infraorbital nerve: superior alveolar (middle, anterior) - internal nasal branches on face inferior palpebral - external nasal - superior labial (infraorbital plexus)
mandibular (V3)	in meninges meningeal anterior to muscles of mastication (medial pterygoid/to tensor veli palatini, lateral pterygoid, masseteric, deep temporal) - buccal posterior auriculotemporal (otic ganglion) - lingual (submandibular ganglion) - inferior alveolar (mylohyoid, mental)

Acknowledgement and Attribution Regarding Sources of Content

Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .