GLOSSARY 559 



anaphylaxis (Sn ;'i fl l;lk' sts). The acute susceptibility of the body to an albuminous 



substance which acts as a poison; or increased susceptibilitj^ to a toxin after 



recovery from poisoning by that toxin. 

 Anaximander (iin ak si man' der). Greek philosopher; 611-547 B.C. 

 animal pole. That pole of an egg cell toward which the protoplasm is accumulated, 

 ante- (an' te). L.; before, 

 antenna (an t6n' a). A sensory appendage on the head of an arthropod, the functions 



of which do not include sight; adj., antennal. 

 anterior (ante'rTer). In front; in a bilaterally symmetrical animal with the axis 



horizontal, toward the head. 

 anthropoid (an' thro poid). Manlike. 

 anti- (an' ti). G.; against. 

 antimere (an' timer). One of the similar parts into which a radially sj'mmetrical 



animal ma.y be divided, 

 antitoxin (an tl t6k' sin). A substance in the body which neutralizes a poison, or toxin, 

 aorta (a or' ta). A large artery arising from the heart of vertebrates, the blood in 



which is sent over the body; branches which pass around the pharynx and reunite 



to form a dorsal aorta are called aortic arches, 

 appendage (a p6n' daj). A projecting part on a metazoan body that is movable and 



has an active function. 

 Aquinas (a kwi' nas), Thomas. Italian scholastic; 1225?-1274? 

 arboreal (ar bo' re al). Pertaining to life in trees. 

 arch- (ark). G.; first, beginning. 

 archenteron (ar k?n' ter 6n). The gastrular cavity in metazoan embryos which 



serves as a primitive digestive cavity; adj., archenteric (ar ken t6r' Ik). 

 Aristotle (ftr' Is tot'l). Greek philosopher; 384-322 b. c. 

 artery (ar' ter i). A vessel carrying blood away from the heart; adj., arterial 



(arte' rial), 

 arthr (ar' thr). G.; joint. 



asexual (a sek' shu al). Not related to sex, or having no sex. 

 assimilation (a sIm I la' shun). The incorporation of food into the living protoplasm; 



adj., assimilative (a sIm' I la tlv). 

 associative memory. Memory involving the relating of previous experiences, 

 aster (as' ter). G.; star. A term applied to the rays which surround the centrosomes 



in a mitotic figure. 

 asymmetry (a sIm' e tri). Lack of symmetry. 

 atoll (at' 61). A circular coral island inclosing a lagoon. 

 atriopore (a' trI 6 por). The external opening of an atrial cavity in one of the lower 



chordates. 

 atrium (a' trI Qm). A cavity on the outside of the body of lower chordates, also 



called atrial cavity; an auricle in the heart; adj., atrial. 

 Augustine, Saint (sant 6 giis' tin). Bishop of Hippo; 354-430. 

 auricle (6' rl k'l). A chamber in the heart which receives l)lood, also called atrium; 



an earlike projection on the side of the head; adj., auricular (6 rik' u lar). 

 auto (6' to). G.; seK. 

 autonomic (otonSm'Ik). Having powers of its own; applied to the sympathetic 



nervous system. 

 autosome (6' to som). Any chromosome except a sex chromosome, 

 autotomy (6 t6t' 6 ml). The automatic breaking off of a part by an animal, 

 axolotl (ak' so iSt'l). A salamander larva which has acquired sexual maturity, or a 



sexually mature salamander which preserves the larval form. 

 axon (ak' s6n). A nerve fiber which conducts impulses away from the body of the 



cell of which it is a part. 



