SPINA

forntal spine, nasal spine of the frontal bone; a projection from the center of the nasal part of the frontal bone, which lies between and articulates with the nasal bones and the perpendicular plate of the ethmoid, s. hel'lcis [BNA], an anteriorly directed spine at the extremity of the eras of the helix of the auricle, s. ili'aca [BNA], one of the four iliac spines, named respectively anterior superior, anterior inferior, posterior superior, and posterior inferior; the first of these gives attachment to the outer extremity of Poupart's ligament and part of the sartcrius muscle, s. ischiad'ica [BNA], sciatic spine, spine of the ischium, a pointed proce from the posterior border of the ischium on a level with the lower border of the acetabulum, s. mea'tus, Henle's* spine, spina supra meatum. s. menta'- lis [BNA], mental spine, genial tubercle; a slight projection, sometimes two, in the middle line of the posterior surface of the body of the mandible, giving attachment to the geniohyoid muscle (above) and the geniohyoglo us (below) s. nasa'lis, nasal spine, s. frontal is [BNA]. s. nasa'lis ante'rior [BNA], anterior nasal spine; a pointed projection at the anterior extremity of the intermaxillary suture. &. nasal is poste'rior [BNA], posterior nasal spine, posterior palatine spine; the sharp posterior extremity of the nasal crest, spi'nse palati'nse [BNA], palatine spines; the longitudinal ridges on the lower surface of the palatal proce of the maxilla. s. pe'dis, a corn. s. per one a'lis, proce us trochlear is of the OS calcis. s. pu'bis, tuberculum pubicum [BNA]. s. scap'ulsB [BNA], the prominent triangular ridge on the dorsal aspect of the scapula, s. teg'minis, a slight bony proce in the tympanum just above the opening into the mastoid antrum, s. supra mea'tum [BNA], Henle's* spine, s. trochlea'ns [BNA], trochlear spine, a spicule of bone arising from the edge of the fovea trochlear is, giving attachment to the pulley of the superior oblique muscle of the eyeball, s. tympan'ica major [B NA], the anterior edge of the notch of Rivinus, or incisura tympanic a. s. tympan'ica minor [BNA], the posterior edge of the notch of Rivinus, or incisura tympanic a. s. vento'sa, a. condition occasionally seen in tuberculosis or cancer of bone, in which there is absorption of bone bordering the medulla with a new deposit under the periosteum, looking as if the bone were inflated with air.