1 68 GLOSSARY. 



Canal of Petit. A space formed by separation of suspensory 



ligament of lens. 



Canal of Stilling. A fine canal in vitreous humour connect- 

 ing optic papilla with posterior surface of lens. Originally 



contained an artery. 

 Carbohydrates (a hybrid from L. carbo, coal ; and Gr. hudor, 



water). Compounds of carbon, oxygen, and hydrogen, in 



which H. and O. exist in the proportions to form water. 

 Carot'id gland (Gr. kara, the head ; otos y the ear). A small 



vascular mass found at upper end of common carotid 



artery. 

 Catacrot'ic pulse (Gr. kata, down; krotos, a striking). That 



variety of pulse tracing which presents secondary waves 



in the descent. 

 Cataphoric action (Gr. kata, down ; phora, a carrying or 



bringing). The phenomena of direct transference of 



fluids from one compartment to another, through a porous 



medium, during passage of galvanic current. 

 Catelectrot onus (Gr. kata, down ; elektron, amber). The 



electrical condition of a nerve in the region of negative 



pole during the passage of a current. 



Cathode (Gr. kata, down; hodos, a way or path). The nega- 

 tive electrode or pole, i.e. where the current leaves 



nerve. 

 Cellulo'se (L. cella, a store-room). The covering of starch 



granules. 

 Centrifugal nerve (Lat. centrum, the centre ; /w/<?, I flee) 



One which conveys impulses from a nerve centre. 



Efferent. 

 Centrip'etal nerve (L. centrum) the centre ; peto, I seek). 



One which conveys impulses to a nerve centre. Afferent. 

 Cerebral vesicles (L. cerebrum, the brain). Primitive 



swellings on the neural tube of embryo from which brain 



is developed. 

 Cerebrin (L. cerebrum, the brain). A glucoside obtained 



from brain substance. 

 Cheyne- Stokes respiration. A peculiar variety of breathing, 



characterized by an alternation of pauses and groups of 



modified respiratory movements ; caused by variations in 



quantity, quality and pressure of blood-supply to brain. 

 Chordae Willisii (Gr. chotde, L. chorda, a gut, a string, a 



chord). Fibrous bands which stretch across the superior 



longitudinal sinus. 



