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The spinal cord. (Sometimes abbrev. to myel.)

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

d volition. In vertebrates it is often divided into three systems: the central, brain and spinal cord; the peripheral, cranial and spinal nerves; and the sympathetic. See Brain, Nerve, Spinal cord, under Spinal, and Sympathetic system, under Sympathetic, and Illust. in Appendix. -- Nervous temperament, a condition of…

ystem; taining to, situated in the region of, or on the side with, the neural, or cerebro-spinal, axis; -- opposed to hemal. As applied to vertebrates, neural is the same as dorsal; as applied to invertebrates it is usually the same as ventral. Cf. Hemal. Neural arch (Anat.), the cartilaginous or bony arch on the dorsa…

tion of nervous debility supposed to be dependent upon impairment in the functions of the spinal cord.

The central canal and ventricles of the spinal cord and brain; the myelencephalic cavity.

ive tissue framework which supports the nervous matter and blood vessels of the brain and spinal cord.

A metameric segment of the cerebro-spinal nervous system.

The brain and spinal cord; the cerebro-spinal axis; myelencephalon. B. G. Wilder.

Spinal neurotics, or tetanics, those which affect the spinal cord. (c) Cerebro-spinal neurotics, or those which affect both brain and spinal cord.

ich forms the posterior segment of the skull and surrounds the great foramen by which the spinal cord leaves the cranium. In the higher vertebrates it is usually composed of four bones, which become consolidated in the adult. -- Occipital point (Anat.), the point of the occiput in the mesial plane farthest from the op…

Palsy of the lower half of the body on both sides, caused usually by disease of the spinal cord. -- Par`a*pleg"ic, a.

The delicate and highly vascular membrane immediately investing the brain and spinal cord.

Situated immediately in front, or on the ventral side, of the vertebral column; prespinal.

Of or pertaining to the rachis; spinal; vertebral. Same as Rhachidian.

A dissecting instrument for opening the spinal canal. [Written also rachiotome.]

ensibility (Physiol.), the sensibility manifested by the anterior, or motor, roots of the spinal cord (their stimulation causing pain) owing to the presence of sensory fibers from the corresponding sensory or posterior roots.

Hardening of the cell wall by lignification. Cerebro-spinal sclerosis (Med.), an affection in which patches of hardening, produced by increase of the neuroglia and atrophy of the true nerve tissue, are found scattered throughout the brain and spinal cord. It is associated with complete or partial paralysis, a peculiar…

nsation and volition; -- applied to those nerve fibers which pass to and from the cerebro-spinal axis, and are respectively concerned in sensation and volition. Dunglison.

A congenital malformation in which the spinal column is cleft at its lower portion, and the membranes of the spinal cord project as an elastic swelling from the gap thus formed.