Angle

(ang'-gl) or Angulus. The degree of divergence of two lines that meet each other; the space between two such lines. A. a., that one of Li auer's angles between the radius fix us and a line joining the alveolar and subnasal points. A. of Aberration. See A. of De- ' viation. A., Ackermann's, certain angles, characteristic of kyphosis, which mark the base of the skull in cases of encephalocele and hydrocephalus; for example, the occipito-sphenoidal angle is abnormally sharp. A., Acromial, that formed between the head of the humerus and the clavicle. A., Alpha. I. In optics, that formed by the intersection of the visual line and optic axis. 2. In craniometry, that one of Li auer's angles between the radius fix us and a line joining the hormion and subnasal point. A., Alveolar, that formed between a line pa ing through a spot beneath the nasal spine and the most prominent point of the lower edge of the alveolar proce of the superior maxilla and the cephalic horizontal line. A., Alveolo-condylar. See A., Orbito-aheolo-condylar. A., Anterior (of Ilium). See A., External (of Ilium). A., Anterior (of Scapula). See A., Cervical (of Scapula). A., Anterior Parietal. See A-, Parietal (of Quat ref ages). A., Antero-external (of Ischium), in veterinary anatomy, the posterior extremity of the supra cotyloid crest. A., Ante roin ternal ('of Ischium), in veterinary anatomy, the portion of the ischium that helps to close the obturator foramen inwardly. A. of Aperture, in optics, that included between two lines joining the opposite points of the periphery of a lens and the focus. A.. Auricular, in craniometry, those cephalic angles having their apices at Broca's auricular point. A., Auriculo-cranial, in craniometry, the auricular angles whose sides pa through the cranium. A., Auriculofacial, in craniometry, those auricular angles whose sides pa through the face. A., Auriculo-frontal. See A., Frontal. A., Auriculo-occipital, in craniometry, the combined sub-occipital and supra-occipital angles. A., Auriculo-parietal. See A., Parietal (of Broca). A. b., that one of Li auer's angles included between the radius fix us and a line joining the bregma and nasion. A., Barclay's. See A., Or i facial. A., Bas i facial, in craniometry, that between the bas i-cranial and bas i facial axes. A., Basilar, in craniometry, that between the naso-basilar and bas i alveolar lines.