basilar a. visual _ a

The a. included between the lines joining the extremities of an object looked at with the posterior nodal point of the eye. parietal a. 1. of Quatre^ fages, an a. formed by the intersection of two lines, drawn one on either side of the head tangent to the most prominent points of the zygomatic arch and the frontoparietal suture. 2. Of Broca, an auricular a. formed by two lines running from Broca's auricular point to the bregma and the lambda [B. N. A., angulus parietal is]. rolandic a. The a. formed by the meeting of the upper part of the fi ure of Rolando with the mesial plane. sacrovertebral a. The a. formed by the anterior surfaces of the last lumbar and the first sacral vertebrae [B. N. A., promontorium]. sphenoidal a. Virchow and Welcher's term for an a. formed by two lines meeting in the median line at the center of the transverse gropve of the optic commi ure, one of which is drawn from the nasion and the other from the basion [B. N. A., angulus sphenoidalisl. sternoclavicular a. Walshe's term for the a. formed by the clavicle with the sternum, symphyseal a. The a. formed by the lower axis of the symphysis ment i with the plane of the lower part of the body of the lower jaw. temporal a. of the eye. The external canthus. vertebroiliac a. The a. formed by the iliac portion of the plane of the pelvic inlet with the vertebral column, vestibular a. The a. formed by the posterior and middle walls of the vestibule, containing the opening of the ampulla common to the two vertical semicircular canals, visual a. See optic a. Welcher's a. See sphenoidal a. xiphoid a. The space between the two borders of the xiphoid notch. [B. N. A., angulus.] [Lat., angulus, corner, angle.]