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A pair. [Obs.] Drayton.

Fourfold; having four similar parts, or two pairs of similar parts. Quadrigeminal bodies (Anat.), two pairs of lobes, or elevations, on the dorsal side of the midbrain of most mammals; the optic lobes. The anterior pair are called the nates, and the posterior the testes.

Thrice twin; having three pairs of leaflets.

Of, pertaining to, or designating, the fifth pair of cranial nerves, which divide on each side of the head into three main branches distributed to the orbits, jaws, and parts of the mouth; trifacial.

e Gasserian ganglion. Gasserian ganglion (Anat.), a large ganglion, at the root of the trigeminal, or fifth cranial, nerve.

Below a trochlea, or pulley; -- applied esp. to one of the subdivisions of the trigeminal nerve.

egion of, the eye; ocular; as the ophthalmic, or orbitonasal, nerve, a division of the trigeminal, which gives branches to the lachrymal gland, eyelids, nose, and forehead. Ophthalmic region (Zoöl.), the space around the eyes.

ove a trochlea or trochlear surface; -- applied esp. to one of the subdivisions of the trigeminal nerve.

See Trigeminal.