44(5 GLOSSARY 



Endocardium. (Within the heart.) The serous membrane lining 

 the interior of the heart. 



Endolymph. The fluid within the membranous labyrinth of the ear. 



Endomysium. (Within a muscle.) The connective tissue between 

 the fibrils of a muscle bundle. 



Endoneurium. (Within a nerve.) The delicate connective tissue 

 holding together the fibrils of a bundle of nerves. 



Endosteum. (Within the bone.) The vascular membranous layer 

 of connective tissue lining the medullary cavity of long bones. 



Endothelial (cells). Flat cells found on the inner surface of vessels 

 and spaces that do not communicate with the external air. 



Endothelium. (From the Greek words meaning within, the nipple.) 

 See Endothelial (cell). 



Entoderm. (From the Greek words meaning within, skin). The 

 inner of the two layers of cells in the blastodermic vesicles of the 

 embryo. 



Enzyme. Any ferment formed within the living organism. 



Ependymal. Relating to the ependyma the lining membrane 

 of the cerebral ventricles and of the central canal of the spinal cord. 



Epiblast. Same as ectoderm. (See ectoderm.) 



Epicranial. Relating to epicranium; the structures covering the 

 cranium. 



Epidermis. (From the Greek words meaning upon, the skin.) 

 The outer or superficial layer of the skin. 



Epigastric. Relating to the epigastrium. 



Epigastrium. (From the Greek words meaning upon, the stomach.) 

 The upper and middle part of the abdominal surface, corresponding 

 to the location of the stomach. 



Epimysium. (Upon a muscle.) The sheath of areolar tissue sur- 

 rounding a muscle. 



Epineurium. (Upon a nerve.) The connective-tissue sheath of a 

 nerve trunk. 



Epiphysis. (From the Greek words meaning upon, to grow.) A 

 process of bone attached for a time to another bone by cartilage, but 

 soon becoming consolidated with the principal bone. 



Epitendinium. (Upon a tendon.) The connective-tissue sheath 

 of a tendon. 



Epithelial. (From the Greek words meaning upon, a nipple.) Per- 

 taining to epithelium. 



Epithelium. (Upon a nipple.) The group of cells that forms the 

 epidermis (outer skin), that lines all membranes of canals that com- 

 municate with the external air, and that are specialized for secretion 

 in certain glands, as the liver, kidney, etc. 



Equilibrium. (From the Latin words sequus "equal;" libra, 

 "balance.") A state of balance. 

 Erythrocyte. A red-blood corpuscle (a small body). 



Esophagus or GEsophagus. (From the Greek words meaning to 

 carry, to eat.) The gullet. The musculomembranous canal, about 

 9 inches long, extending from the pharynx to the cardiac end of the 

 stomach. 



Ethmoid (bone). (From the Greek words meaning a sieve, likeness.) 

 Sieve-like. 



