GLOSSARY: 85 
Aqueeductus vestibuli (L. aqueduct of the vestibule). 
—A canal which leads from the vestibule of 
the internal ear to the posterior surface of the 
petrous bone. 
Articulare (L. artzculus, a joint)—A bone of the 
posterior portion of the lower jaw, formed 
in most vertebrates, except Mammals, from 
an ossification of Meckel’s cartilage. 
Arytenoid (Gr. avytaina, a pitcher ; ezdos, shape).— 
Applied to two cartilages, situated on the 
upper border of the cricoid cartilage, at the 
back of the larynx. 
Astragalus (Gr. astragalos, die-shaped)—A_ bone of 
the tarsus, in man forming the ankle-bone, 
the morphological components consist of 
tibiale and intermedium. 
Atlas (Gr. In the Greek Mythology, a giant who bore 
up the earth upon his shoulders).—The first 
cervical vertebra. 
Autogenous (Gr. azzos, self ; geneszs, birth)— Applied 
1d 
to parts of a bone developed from indepen- 
| dent centres of ossification. 
Antostylic.—A term applied to skulls in which the 
mandibular arch is attached to the cranium 
without the intervention of the hyoid arch. 
Axial. A term used to denote that portion of the 
skeleton forming the main axis of the body. 
Axis (L. a pivot).—The second cervical vertebra. 
Basalia Gr. daszs, a pedestal).—Applied to the base of 
the skull. The basal cartilages of the fins of 
Elasmobranch fishes. 
