Sharpey's Perforating Fibers

Transverse or perpendicular periosteal fibers, most numerous in the superficial lamellae of spongy bones; they are also present noidean, a delicate partition lying between the pial sheath and the dural sheath of the optic nerve. S., Axis-cylinder. See Huxley's Layer. S., Capillary, or S., Cir cum vascular, a wide lymphatic tube surrounding some of the smallest blood-vc S., Cellular. See Epineurium . S., Cortical, the bast-bundles. S., Dentinal, the structure lining the dentinal canals. S., Dural, a strong fibrous membrane forming the external investment of the optic nerve. See Dura . S., Femoral. See Femoral. S., Fibril, a sheath formed of connective-ti ue fibrils and surrounding individual nerve-fibers. S. of Henle, an attenuated extension of the perineurium investing the fibers composing funiculi of a nerve-trunk; it consists of a delicate fibrous envelop lined with endothelial plates, which in some cases alone represent the entire sheath. S., Huxley's. See Huxley's Layer. S., Lamellar. See Perineurium . S., Leaf. See Vagina . S. of Mauthner, a protoplasmic investing membrane beneath the neurilemma and the nodes of Ranvier, pa ing inward to separate the myelin from the axis cylinder. S., Medullary, the myelin-sheath surrounding the axis-cylinder. S., Myelin. Medullary Sheath and Neurilemma. S., Nerve. See Perineurium . S., Neumann's. See S., Dentinal. S., Per i vascular. See S., Capillary. S., Pial, the extension of the pia which closely invests the surface of the optic nerve. See Pia . S., Primitive. See Neurilemma. S., Root. See Roots heath. S. of Schwann. See Neurilemma. S., Synovial, a synovial membrane which lines the cavity attached to a bone and through which a tendon glides. S., Tangential, the fibro-cellular sheath surrounding the carotids. Shed. To throw off. Shedding. Throwing off. S. Teeth, trie teeth of the first dentition; the term is also applied to the lo of the first or temporary set of teeth. A ruminant mam(shep). mal of the family Bovida and genus Ovis. S.-bug. See Argas tholozani in Parasites (Animal), Tat S. -cough. See Hoose . Also Strongyl us jilaria, Rudolphi, under Parasites. S. Gadfly. See Oestrus ovis, L., under Parasites (A?/: Table of. S. -laurel. See Kalmia . S. -louse. Trichodectis sphcerocephahis, Nitzsch, in Parasites (Animal), Table of. S.-pest, the sheep-tick. S.-pox, a contagious pustular disease of sheep similar to cowpox.