GLOSSARY 389 



Rick'ets : a disease of early life characterized by defective nutrition 

 of the bones, and often due to a lack of proper food. 



Ri'gor mor'tis (Lat., rigidity of death) : the condition in a dead ani- 

 mal body due to a coagulation of the protoplasm of the muscle 

 cells. 



Rods of Cor'ti : pillarlike cells forming part of the organ of Corti in 

 the inner ear. 



Sac'cule (Lat. sacculus, a little sac) : part of the membranous laby- 

 rinth of the ear. 



Sa'crum (Lat. sacer, sacred) : the lower part of the spine, immedi- 

 ately above the coccyx. 



Sa-li'va (Lat., spittle) : the mixed secretions of the salivary glands 

 and the mucous membrane of the mouth. 



Sal'i-va-ry glands : the parotid, submaxillary, and sublingual glands 

 which pour their secretions into the mouth. 



Salt : a chemical compound formed by uniting an acid with a base. 

 The salts which are food elements are chiefly chlorides, phosphates, 

 and carbonates of sodium, potassium, calcium, and magnesium, 

 with salts of iron and some organic acids. 



Sar-co-lem'ma (Gr. sarx, flesh, and lemma, a husk) : the membrane 

 surrounding a striped muscular fiber. 



Scap'u-la (Lat.) : the shoulder blade. 



Sci-at'ic nerve (Lat. sciaticus) : the nerve of the hip and thigh. 



Scle-rot'ic (Gr. skleros, hard) : the outer coat of the eye. 



Se-ba'ceous glands (Lat. sebaceus, from sebum, tallow) : small glands 

 under the skin which secrete an oily matter which softens and 

 lubricates hair and skin. 



Se-cre'tion (Lat. secretio, the act of secreting) : the process by which 

 the various glands separate material from the blood and elaborate 

 it into new substances so as to form the various secretions, as bile, 

 saliva, etc. 



Se-cre'to-ry nerves : nerves that supply the organs of secretion. 



Sem-i-cir'cu-lar canals : three half-circular canals of the internal ear. 



Sem-i-lu'nar valves (Lat. semi-, half, and lunar is, from luna, the 

 moon) : valves of the heart, at the beginning of the aorta and of 

 the pulmonary artery, which prevent the blood from flowing back 

 into the ventricle. 



Sen'so-ry areas: those portions of the brain whose stimulation re- 

 g ults in sensation. 



