GLOSSARY 375 



Con'scious-ness (Lat. con, together, and scire, to know) : knowledge 



of one's own mental operations. 

 Con-tract' ile substance (Lat. contrahere, to draw together) : the soft, 



half-fluid material of light and dark disks composing the muscle 



cells of voluntary muscles. 

 Con-trac-til'i-ty : the power possessed by living cells of changing 



form independently of pressure. 

 Co-or-di-na'tion (Lat. co, together, and ordinare, arrange) : the act of 



arranging in due order or relation. 

 Co'ri-um (Lat., a hide, leather) : the innermost layer of the skin ; the 



true skin. 

 Cor'ne-a (Lat. corneus, horny) : the transparent part of the coat of 



the eye which covers the iris and pupil. 

 Cor'o-na-ry arteries (Lat. corona, crown) : the arteries of the heart 



itself. 



Coronary veins : the veins of the wall of the heart. 

 Cor'po-ra quad-ri-gem'i-na (Lat., fourfold bodies) : one of the five 



chief divisions of the brain ; called also the optic lobes. 

 Cor'pus-cle (Lat. corpusculum, diminutive of corpus, a body) : a minute 



particle or cell, as a blood corpuscle, a lymph corpuscle. 

 Cor'pus cal-lo'sum (Lat., callous body) : the great white band of nerve 



tissue connecting the hemispheres of the cerebrum. 

 Cor-re-late' (Lat. con, together, and relatus, referred) : to place in 



mutual or reciprocal relations ; to establish a relation of inter- 

 dependence. 

 Cor'tex (Lat., bark) : an outer layer, as of the brain or the kidney. 



The cortex of the brain consists mostly of gray matter. 

 Cos'tal (Lat. costa, rib) : pertaining to the ribs or side of the 



body. 

 Cra'ni-al : belonging in any way to the cranium, as the cranial nerves 



or arteries. 



Cra'ni-um (Lat., from Gr. kranion, the skull) : the human skull. 

 Cri'coid (Gr. krikos, ring, and eidos, form) : a circular cartilage of the 



larynx. 

 Cru'ra cer'e-bri (Lat., literally, the legs of the brain) : the bands of 



nervous matter connecting the cerebrum with the medulla. 

 Crys'tal-line lens : the principal lens of the eye, lying just back of 



the pupil. 



Cu'ti-cle (Lat. cuticula, from cutis, the skin) : the epidermis 01 outer- 

 most layer of the skin. 



