GLOSSARY 433 



(Highmore). A hollow cavity found in each maxilla bone. 

 The anMim: any hollow cavity or space. 



Apex. The tip, point, or extremity of anything. 



Aponeurosis. A fibrous, membranous expansion of a tendon giving 

 attachment to muscles or serving to enclose and bind down muscles. 



Appendicular. (From the Latin word appendicula, "a small appen- 

 dix. See Appendix.) Pertaining to the extremities of the body. 



Appendix (vermiform). (From the Latin word appendere, "to hang 

 upon or to.") An appendage. 



Aqueductus. (From the Latin words aqua, "water;" ductus, "a 

 leading.") Any canal for the passage of fluid. Nerves, arteries, etc., 

 in structures of the body. 



Aqueous. (From the Latin word aqua, "water.") Watery, as the 

 aqueous humor within the eye-ball. 



Arachnoid. Resembling a spider's web. A membrane of the spinal 

 cord and brain between the pia and dura mater. 



Arbor Vitse. (From the Latin words arbor, "a tree;" vitae, "of 

 life.") The appearance of a structure resembling the evergreen tree; 

 as seen on cutting the cerebellum in a longitudinal section, also the 

 similar appearance of the folds of the mucous membrane of the neck 

 of the uterus. 



Areolar. (From the Latin word areola, dim. of area, "an open 

 space.") Relating to areola (pi. se). Any minute space in a tissue, 

 as seen in cellular or loose connective tissue. 



Artefact. (From the Latin words arte, "by art;" factum, "made.") 

 A structure or tissue which has been changed from its natural state. 

 (Can only be seen by the microscope.) 



Arteriole. (From the Latin word arteriola, a small artery.) A very 

 small artery continued from the larger arteries and ends in the capillary. 



Artery. (From the Greek meaning "to keep air." The ancients 

 always though the arteries contained air.) A closed tube which con- 

 veys the blood, propelled by the heart, to all parts of the body and 

 terminates as the arterioles and capillaries. 



Arthrosis. (From the Greek meaning "to fasten by a joint.") 

 Articulation or jointing, as the extremities of bones are joined by 

 ligaments. 



Articular. (From the Latin word articularis, "of the joint.") 

 Pertaining to an articulation or joint. 



Arytenoid, Resembling the mouth of a pitcher. 



Asternal. Not connected with the sternum, as the false ribs. 



Astragalus. (Named from the Greek meaning a dice, named from 

 the fact that the ancients used the corresponding bones of the sheep 

 as dice.) The ankle bone upon which the tibia rests. 



Atlas. The first vertebra of the spinal column articulating with the 

 occipital bone and thus sustaining the globe of the head, whence the 

 name. (Any support or prop is termed an atlas, based on the belief 

 of the ancient Greeks that the gods (Atlantes) bore up the pillars of 

 heaven, which were named after Mount Atlas in Western Africa.) 



Atrioventricular. Relating to both the atrium (auricle) and ventricle 

 of the heart. 



Atrium. (The forecourt or hall.) That part of the auricle of the 

 heart into which the venous blood is poured. 

 28 



