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all the hindbrain except the cerebellum and pons, and from it a large part of the cranial nerves arise. It controls very largely respiration, circulation, swallowing, and other functions, and is the most vital part of the brain; -- called also bulb of the spinal cord. See Brain.

ifluid substance (myelin), between the primitive sheath and axis cylinder of a medullated nerve fiber.

Furnished with a medulla or marrow, or with a medullary sheath; as, a medullated nerve fiber.

Of or pertaining to the chin; genian; as, the mental nerve; the mental region.

The power og changing color at will by the expansion of special pigment cells, under nerve influence, as seen in many reptiles, fishes, etc. Cope.

up motion; pertaining to organs of motion; - - applied especially in physiology to those nerves or nerve fibers which only convey impressions from a nerve center to muscles, thereby causing motion.

Having many poles; -- applied especially to those ganglionic nerve cells which have several radiating processes.

Pertaining both to muscles and skin; as, the musculocutaneous nerve.

Of or pertaining to the muscles, and taking a spiral course; -- applied esp. to a large nerve of the arm.

A soft white substance constituting the medullary sheats of nerve fibers, and composed mainly of cholesterin, lecithin, cerebrin, albumin, and some fat.

esembling, if not identical with, the substance (myelin) forming the medullary sheaths of nerve fibers.

Of or pertaining to the myelon; as, the myelonal, or spinal, nerves.

taining to, or in the region of, the lower jaw and the hyoid apparatus; as, the mylohyoid nerve.

cisor, canal connecting the mouth and the nasal chamber in some animals; the nasopalatine nerve.

Nerved.

The arrangement of nerves and veins, especially those of leaves; neuration. The outlines of the fronds of ferns, and their nervation, are frail characters if employed alone for the determination of existing genera. J. D. Hooker.

ent caused in the sensory organs by external agents and transmitted to the muscles by the nerves. Dunglison.

Having the quality of acting upon or affecting the nerves; quieting nervous excitement. -- n.

Of or pertaining to both nerves and muscles; of the nature of nerves and muscles; as, nervomuscular energy.

Same as Nerved.