Craniometrical

(kra-ne-oi/iet’-rik, kra-ne-o-met’ -rik-al) [upaviov, skull; /xerpov, a measure]. Pertaining to craniometry. C. Point, any one of the points of measurement used in craniometry. A list of the craniometric points is given. Acanthi on, a point in the median line of the skull at the base of the nasal spine. Alveolar Point, the point between the two middle incisors of the upper jaw. Ant in i on, that point on the glabellum, and in the median line, that is farthest from the inion. Aste- RION, the point behind the ear where the parietal, temporal and occipital bones meet. Auricular Point, the center of the orifice of the external auditory meatus. Basion, the middle point of the anterior margin of the foramen magnum. Bregma, the point where the coronal and sagittal sutures meet. Dacryon, or Dakryon, the point beside the root of the nose where the frontal, lacrymal, ” and superior maxillary bones meet. Entomion, the point where the parietal notch of the temporal bone receives the anterior extension of the mastoid angle of the parietal bone. Glabella, or Glabellum, the point in the median line between the superciliary arches, marked by a swelling, sometimes by a depre ion. Gnathion, same as Mental Point. Gonion, the point at the angle of the lower jaw. Hormion, the anterior point of the basilar portion of the united sphenooccipital bone, where it is cro ed by the median line. Inion, the external occipital protuberance. Jugal Point, the point situated at the angle that the posterior border of the frontal branch of the malar bone makes with the superior border of its zygomatic branch. Koronion, the apex of the coronoid proce of the inferior maxilla. Lambda, the point of meeting of the sagittal and the lambdoid sutures. Malar Point, a point situated on the tubercle on the external surface of the malar bone, or at the intersection of a line drawn from the external extremity of the frontomalar suture to the tubercle at the inferior angle of the malar bone and a line drawn nearly horizontally from the inferior border of the orbit over the malar bone to the superior border of the zygomatic arch. Maximum Occipital Point, or Occipital Point, the posterior extremity of the anteroposterior diameter of the skull, measured from the glabella in front to the most distant point behind. Mental Point, the middle point of the anterior lip of the lower border of the lower jaw. Me top i on, or Metopic Point, a point in the middle line between the two frontal eminences. Nasion, or Nasal Point, the middle of the frontal suture at the root of the nose. Obelion, the part of the sagittal suture between the two parietal foramina. Occipital Point. See Maximum Occipital Point. Ophryon, the middle of the supraorbital line, which, drawn acro the narrowest part of the forehead, separates the face from the cranium. Opisthion, the middle point of the posterior border of the foramen magnum. Prost hi on, the alveolar point. Pterion, the point where the frontal, parietal, temporal, and sphenoid bones come together. Rhinion, the upper median point of the anterior nasal opening. Spinal Point. Same as Subnasal Point. Step han i on, Inferior, the point where the ridge for the temporal muscle intersects the coronal suture. Step han i on, Superior, the point where the coronal suture cro es the temporal ridge. Subnasal Point, the middle of the inferior border of the anterior nares at the base of the nasal spine. Supra auricular Point, the point vertically over the auricular point at the root of the zygomatic proce . Supra nasal Point. Same as Ophryon. Supraorbital Point. Same as Ophryon. Symphysion, the median point of the outer border of the alveolus of the lower jaw. Vertex, the superior point of the skull. In obstetrics, that conic portion of the skull the apex of which is at the posterior fontanel and the base of which is formed by the biparietal and trachelobregmatic diameters. 212