GLOSSARY 333 



Pro'te-ids (Greek protos, first), the food stuffs that build tissues. 

 Pro'to-plasm (Greek protos, first, and plasma, form), the original 



cell substance, " the physical basis of life." 

 Py-lor'us (Greek pyloros, gate keeper), the opening between the 



stomach and the small intestine ; also the muscle that closes 



the opening. 



Ra'di-us (Latin, staff, rod, spoke of a wheel), the bone of the fore- 

 arm on the thumb side. 

 Res'pi-ra'tion (Latin re-, again, back, and spirare, spiratus, to blow), 



the process of taking oxygen into the blood and getting 



carbon dioxid out. 

 Ret'i-na (Latin rete, net), the innermost coat of the eyeball, in which 



the fibers of the optic nerve end. 

 Sa'crum (Latin sacrum, sacred ; os sacrum, the sacred bone, so called 



from its having been offered formerly in sacrifices), the bone 



at the lower end of the spine just above the coccyx. 

 Sa-li'va (Latin, spittle), the secretion of the salivary gland ; it 



serves to moisten the mouth, to aid in swallowing, and to aid 



in digestion. 

 Sca-lene' (Greek skate nos, uneven), muscles of the neck that aid in 



breathing. 



Scap'u-la (Latin), the shoulder blade. 

 Scle-rot'ic (Greek skleros, hard), the hard, tough, outer coat of the 



eyeball. 

 Se-ba'ceouS glands (Latin sebum, grease), the oil glands of the 



skin. 

 Se-cre'tion (Latin se-, apart, and center e, cretum, to sift), the process 



of forming certain liquids by the glands of the body, as bile, 



saliva, gastric juice. 



Sem'i-lu'nar (Latin semi-, half, and luna, moon), shaped like a half- 

 moon. 

 Sen'so-ry areas (Latin sensus, feeling), the poitions of the brain to 



which the incoming stimuli are carried. 

 Se'rum (Latin, whey), the yellowish, watery fluid that is squeezed 



out when blood clots. . 

 Sphe'noid (Greek sphen, wedge, and -oid, like), a large bone on the 



under surface of the skull. 

 Sphinc'ter (Greek sphinkter, anything that binds tight), a muscle 



that surrounds an opening or tube, as the pylpric muscle, 



