from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Below a trochlea; applied especially to one of the subdivisions of the trigeminal nerve.
from the GNU version of the Collaborative International Dictionary of English
- adj. Below a trochlea, or pulley; -- applied esp. to one of the subdivisions of the trigeminal nerve.
from The Century Dictionary and Cyclopedia
- Situated below the trochlea or pulley of the superior oblique muscle of the eyeball, at the inner corner of the orbit of the eye: as, the infratrochlear nerve, a branch of the fifth cranial nerve, which issues from the orbit below the trochlea.
The supratrochlear nerve (n. supratrochlearis), the smaller of the two, passes above the pulley of the Obliquus superior, and gives off a descending filament, to join the infratrochlear branch of the nasociliary nerve.
The infratrochlear nerve (n. infratrochlearis) is given off from the nasociliary just before it enters the anterior ethmoidal foramen.
The nerves for the muscles of the nose are derived from the facial, while the skin receives branches from the infratrochlear and nasociliary branches of the ophthalmic, and from the infraorbital of the maxillary.
The superficial branches run beneath the skin and above the superficial muscles of the face, which they supply: some are distributed to the Procerus, joining at the medial angle of the orbit with the infratrochlear and nasociliary branches of the ophthalmic.
"Again, if the ophthalmic has received motor fibers from the fourth, third, and sixth, as already stated, the supraorbital branch of the frontal nerve, which goes partly to the upper lid, would carry motor influence, and from this same (frontal) nerve the lower lid could be supplied through the infratrochlear.