GLOSSARY. 169 



Cho'rion frondo'sum (Gr. chorion, skin or leather). The 

 chorionic villi which are embedded in decidua vera, and 

 enter into the formation of placenta. 



Cho'rion lae've (Gr. chorion, skin or leather). The chorionic 

 villi which are embedded in decidua reflexa and disap- 

 pear early. 



Ciiristison's formula. A method of approximately estimat- 

 ing the amount of solids in urine. The last two figures of 

 specific gravity are multiplied by 2*33, which gives the 

 quantity in 1000 parts. 



Chroma'tic aberra'tion (Gr. chroma, colour; L. aberro, I 

 wander). The splitting up of white light into prismatic 

 colours during its passage through a lens. 



Cilio spinal centres. Situated in medulla oblongata and 

 lower cervical region of spinal cord, and which are con- 

 cerned in the dilating mechanism of pupil. 



Clarke, Column of. A collection of nerve cells, situated in 

 posterior horn of grey matter of spinal cord. 



Clarke-Maxwell's experiment. A method of demonstrating 

 the yellow spot of retina by looking through a solution of 

 chrome alum. 



Climacteric (Gr. klimax, gen. klimakos, a ladder or staircase). 

 That period of life when the menstrual flow ceases. 



Coccygeal gland (Gr. kokkux, the cuckoo, imitation of its cry, 

 a crest, kokkugos, of the cuckoo ; L. coccyx, the cuckoo ; 

 coccygis, of the cuckoo). A vascular mass found' in front 

 of coccyx, shown to be remains of neurenteric canal. Also 

 called " Luschka's gland." 



Colobo'ma (Gr. kolobos, docked, stunted, curtal). A cleft in 

 the iris or choroid due to defective development. 



Columns of Morgagni. Vertical folds of mucous membrane 

 in rectum. 



Complemental air (L. complementum, that which completes or 



fills up). The additional air which can be taken in after 



tidal air has entered, and which completely fills the lungs. 



Complementary colours (L. complementum, that which com- 

 pletes or fills up). Any two colours which together give 

 the sensation of white. 



Conjugal ligaments (L. conjugo, I bind together). Bands of 

 fibrous tissue which surround the intervertebral discs and 

 connect the heads of corresponding ribs. 



Coraco-humeral ligament (Gr. korak, a crow, because of its 

 resemblance to a crow's beak ; L. humerus, the arm).- 



