spiloplania

(spi-lo-pla’ne-ah) [Gr. σπίλος spot + πλάνος wandering]. A transient erythema. spiloplaxia (spi-lo-plaks’e-ah) [Gr. σπίλος spot + πλάξ plate]. A red spot seen in cases of leprosy, or pellagra. spilus (spi’lus) (Gr. σπίλος spot]. Same as nevus. spina (spi’nah), pl. spi’ne [L. “ spine,” “‘ thorn ”’]. Any spine-like proce or projection. 8. angula’- ris, the spinous proce of the sphenoid bone. 8. bif’ida, congenital cleft of the vertebral column with meningeal protrusion. 8. bif’ida occul’ta, spina bifid a in which the tumor is very small or scarcely noticeable. 8. front a'lis, the nasal spine. 8. hel’icis, the {pious roce of the helix of the ear. hiad‘ica, spine of the ischium. s. mea fuses a nie as proce projecting from the temporal bone, just above and at the back of the auditory meatus. 8. menta’- lis, the mental spine. 8. teg’minis, a proce of bone in the middle ear, over the entrance to the mastoid antrum. s. trochlea‘ris, the trochlear spine. 8. tympan‘ice, the two projecting points of the tympanic plate. 8. vento’sa, enjargement and thinning of a bone in cancer or caries, with an appearance as if it were puffed full of air. spinal (spi’nal) (L. spina’lis]. Pertaining to a spine or to the spinal column. 8. column, the column composed of the vertebre with their fibrocartilages and ligaments, and inclosing the spinal canal. 8. cord, the cord-like structure contained in the spinal canal, and extending from the foramen magnum to the second lumbar vertebra. It is directly continuous with the oblong at a, and with the brain constitutes the cerebroinal axis. It is inclosed by three membranes— the dura mater, arachnoid, and pia mater. The spinal cord gives off the spinal nerves, and is divided into cervical, thoracic, lumbar, sacral, and coccygeal regions, corresponding to the nerves given off. There is an enlargement of the cord (cervical enlargement) where the nerves of the arms are given off, and one (lumbar enlargement) where those of the legs are given off. The cord is divided by anterior and posterior median fi ures into two lateral halves; these halves are connected by an isthmus, which is made up of the anterior white commi ure and the anterior and posterior gray commi ures. The cord is pierced longitudinally by a central canal running through the cord. Each lateral half of the cord is made up of a central portion of gray matter inclosed by white matter. The gray matter consists of an anterior and a posterior horn, connected respectively with an anterior and a posterior nerve-root, and of ma es of nerve cells. The white mattcr is made up of an anterolateral column, which consists of the direct pyramidal tract, or column of Tiirck, the cro ed pyramidal tract, the cerebellar tract, the postero-external column, or column of Burdach, containing the posterior root-zone, and the posteromedian column, or column of Goll. The spinal cord is a center for certain reflex actions, and forms a pathway to and from the brain. 8. nerves, the thirty-one pairs of nerves which arise from the spinal cord and pa out between the vertebra. They include eight pairs of cervical, twelve of dorsal, five of lumbar, five of sacral, and one of coccygeal. See nerves, table of.