cav'emo us

g., carotid sulcus, sulcus car otic us [BNA], the groove on the upper surface of the sphenoid bone, supporting the cavernous sinus and the carotid artery. deTelopmen'tal g., one of the lines or grooves on the surface of the enamel of a tooth, marking its primitive divisions as. formed. med'uUaiy g., vertebral g. (2). mylohy'- surface of the ramus of the mandible lodging the mylohyoid artery and nerve, nasopal'atine g., a g. on the vomer lodging the nasopalatine nerve. nasppharyn'geal g., an indistinct line marking the (boundary between the nasal cavities and the rhino pharynx. neu'ral g., vertebral g. (2). lOMac'tory g., a shallow depre ion on the cribriform plate of the ethmoid bone on either side of the crista gall i, lodging the olfactory lobe of the cerebrum, op'tic g., sulcus chiasm at is [BNA],,a groove on the upper surface 01 the sphenoid bone in which rests the optic commi ure. I poste'rior para me'dian g., sulcus in termed i us posterior [BNA). posterolat'eral g., a line on the surface of the medulla where are the root bundles of the spinal acce ory, vagus, and glo opharyngeal nerves, prim'itive g., primitive* streak, subcla'vian g., a shallow g, on the clavicle lodging the sub clavi us muscle, subcos'tal g., sulcus costal is, a groove on the inner surface of the lower border of each rib. supple men'tal g., a long shallow depre ion in the surface of a tooth, usually having a smoothly rounded base; the difference between a supplemental and a developmental g. is that the former does not mark the junction of lobes, ver'tebral g., (i) a surface depre ion on each side of the line of the spinal proce es of the vertebras; (2) an embryonic sulcus developed from the primitive groove, forming later the medullary tube or primitive spinal cord; medullary g.