562 GLOSSARY 



Alveoli (al-ve'-5-li), small air sacs in the lungs. 



Amoeboid (a-me'-boid), pertaining to the method of locomotion by means of 



pseudopodia as is found in amoeba. 

 Amitosis (a-mi-t5'-sis), cell division without the formation and division of 



chromosomes. 

 Amnion (am'-ni-on), a membrane containing a fluid in which the embryo of 



reptiles, birds and mammals float. 

 Ampulla (am-puT-a), a small membranous sac. 

 Analogous (a-nal'-o-gus), referring to body parts of animals that have different 



embryonic and phylogenetic origins, but which have the same function. 

 Analogy (a-nal'-o-jl), the relationship between body parts having different 



embryonic and phylogenetic origin, but with the same function. 

 Anaphase (an'-a-faz), the third phase of mitosis. 



Anatomy (a-nat'-o-mi), a phase of biology dealing with gross structure; a sub- 

 division of morphology. 

 Antenna (an-ten'-a), a sensitive "feeler" from the head of an animal. 

 Anus (a'-nus), the posterior opening of the digestive tract. 

 Aorta (a-or'-ta), the largest artery of vertebrates; it leads from the heart 



carrying blood to other arteries of the body. 

 Aquatic (a-kwat'-ik), pertaining to the water. 

 Archenteron (ark-ent'-er-on), the primitive intestine. 

 Atrium (a'-tri-um), a cavity. 



Auricle (o'-ri-kl), a chamber of the heart that receives blood coming to the heart. 

 Autonomic (6-to-nom'-ic), refers to a part of the nervous system that regulates 



the involuntary reactions of the body. 

 Autotomy (6-tot-o-mi), the throwing off of a limb or other body part, usually 



following an injury to that body part. 



Biramous (bl-ra'-miis), possessing two branches. 



Blastocoel (blas'-to-sel), the cavity within the blastula. 



Blastopore (blas'-to-por), the external opening of the early archenteron. 



Blastula (blas'-tu-la), the hollow-ball stage of embryology. 



Bronchial (brSng'-ki-al), refers to tubes leading to the lungs. 



Caecum (se'-kGm), pi. caeca, a blind pocket-like pouch. 



Calcareous (kal-kar.'-e-us), composed primarily of lime. 



Capillary (kap'-I-ler-I), a tiny blood vessel that connects an artery with a vein. 



Carapace (kar'-a-pas), the hard covering of the cephalothorax of many crus- 

 taceans. 



Cardiac (kar'-di-ak), refers to the heart. 



Carotid (ka-ro'-tid), pertaining to the large arteries of the neck. 



Carpal (kar'-pal), a wrist bone. 



Cartilage (kar'-ti-laj), an elastic animal tissue; usually precedes bone in the 

 formation of the skeleton of chordates. 



Caudal (ko'-dal), pertaining to the tail. 



Centrosome (sen'-tro-som), a body consisting of a central centriole with radi- 

 ating astral rays found in the cytoplasm of most animal cells; forms the 

 spindle figure for mitosis. 



Cephalo- (sef'-a-lo), prefix referring to head. 



Cerebellum (ser-e-bel'-um), a division of the brain of chordates. 



Cerebrospinal (ser-e'-bro-spi'-nal), referring to the brain and spinal cord. 



