GLOSSARY 481 



Em'bryo. The ovum and product of conception up to the fourth month, 



when it becomes known as the foetus. 

 Emul'sion. [From the Lat. emulgere, to " milk."] A mixture of liquids, 



insoluble in one another, where one is suspended in the other in the 



form of minute globules, as the fat in milk. 

 Enarthro'sis. [From the Gr. en, " in," and arthron, a " joint."] An 



articulation in which the head of one bone is received into the cavity 



of another, and can be moved in all directions. 

 Endocar'dium. [From the Gr. endon, " within," and kardia, " heart."] 



Lining of the heart. . 

 En'dolymph. [From the Gr. endon, " within," and Lat. lympha, " water."] 



The fluid in the membranous labyrinth of the ear. 

 Endos'teum. [From the Gr. endon, " within," and osteon, a " bone."] 



The lining membrane of the medullary cavity of a bone ; the internal 



periosteum. 

 Endothe'lium. [From the Gr. endon, " within," and thele, the " nipple."] 



A term appUed to single layers of flattened transparent cells, applied 



to each other at their edges and Uning certain surfaces and cavities 



of the body. In contradistinction to epithelium. 

 En'siform. [From the Lat. ensis, a "sword," and forma, "form."] 



Shaped like a sword. 

 En'toderm. [From the Gr. endon, " within," and derma, the " skin."] 



The completed inner layer of cells, or inner blastodermic membrane. 



Opposed to ectoderm. Same as hypoblast. 

 En'zyme. [From the Gr. en, " in," and zume, " leaven."] A term applied 



to a class of ferments. 

 Ep'iblast. [From the Gr. epi, " upon," and blastos, a " germ," or 



" sprout."] The external, or upper, layer of the germinal mem- 

 brane. 

 Epicra'nial. [From the Gr. epi, " upon," and kranion, "the cranium."] 



That which is upon the cranium or scalp. 

 Epider'mis. [From the Gr. epi, " upon," and derma, the " skin."] The 



outer layer of the skin. 

 Epigas'tric. [From the Gr. epi, " upon," and gaster, " stomach."] 



Lying upon, distributed over, or pertaining to the abdomen or the 



stomach. 

 Epiglot'tis. [From the Gr. epi, " upon," and glottis, the " glottis."] The 



cartilage at the root of the tongue which forms a Ud or cover for the 



aperture of the larnyx. 

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