Dictionary.net

a major part of the central nervous system which conducts sensory and motor nerve impulses to and from the brain; a long tube-like structure extending from the base of the brain through the vertebral canal to the upper lumbar region

a major part of the central nervous system which conducts sensory and motor nerve impulses to and from the brain; a long tube-like structure extending from the base of the brain through the vertebral canal to the upper lumbar region

Spinal marrow, spinal cord; the elongated cylindrical portion of the cerebrospinal axis, or central nervous system, which is contained in the canal of the spinal or vertebral column.

Prolongement rachidien of the encephalon, is the continuation of the medulla oblongata. It commences at the foramen magnum of the occipital bone, and descends in the vertebral canal as low as the 2d lumbar vertebra, without filling it; presenting, in its course, several evident enlargements. It is grooved on both its anterior and posterior surfaces by a furrow, which divides it, in its whole length, into two great nervous cords, intimately united with each other. it terminates by an oval tubercle, whence a number of nerves set out called Cauda equi'na, [F.] Queue de cheval, from its resemblance to a horse's tail. The spinal marrow has no analogy, as regards its structure, with the marrow of long bones. It is formed of two substances; one white, the other gray, presenting an inverse arrangement to that which they have in the brain, the white being external, the cineritious at the centre, Substantia grisea centralis. It is enveloped by a yellowish, fibrous membrane, very resisting, which seems to be continued insensibly from the pia mater, and by two other membranes, which are merely prolongations of the arachnoid and dura mater. See Nerve.

Spinal cord, or myelon.

See medulla spinae.