GLOSSARY 453 



spongioblast cells. The cells of the neural tube which form ependyma and glia cells. 



squamosal. The bone which forms the thin vertical element of the temporal. 



stapes. The innermost earbone which is attached to the foramen vestibuli. 



static organ. .\n organ of equilibration, a statocyst. 



status thymicolymphaticus. A edematous condition associated with enlarged thymus. 



steapsin (lipase). A fat-splitting enzyme secreted by the pancreas. 



Steno's (Stensen's) duct. The duct of the parotid gland. 



steraebra. One of the segments of the sternum. 



stimulofugal. Reacting by motion or growth away from a stimulus. 



stomodeum. The ectodermal invagination which leads to the formation of the mouth. 



stratum comeum. The outer horny layer of the epidermis. 



stratum germinativum. The lowest layer of the epidermis from which the other layers 



are derived. 

 stroma. The connective tissue matri.x of an organ, 

 styloid. Long and pointed. 



sublingual gland. A salivary gland below the tongue. 



submaxillary gland. A mixed salivary gland below the angle of the lower jaw. 

 submucosa. The connective tissue layer below the mucous lining of the intestine. 

 sulcus. A groove or fissure especially of the brain, 

 superciliary. Pertaining to the region of the eyebrows. 



superior colliculi. The anterior larger pair of swellings of the corpora quadrigemina. 

 supination. Turning the palm upwards. 

 Sussex man. A prehistoric type of man the remains of which were found at Piltdown, 



Sussex, England. 

 suture. The line of junction of two cranial bones. 

 sympathin. A neurohumor secreted by sympathetic nerves. 

 symphysis. The line of junction of primarily separate bones, 

 synapse. The histological connexion between two neurons, 

 synarthrosis. The fusion of two bones with resultant elimination of a joint, 

 syncytium. A multinucleate mass of protoplasm, 

 systole. The contraction of the heart. 



talus (astragalus). The ankle bone which articulates with the tibia. 



tarsal (Meibomian) glands. Sebaceous glands of the eyelid. 



tarsus. The ankle or instep Avith its seven bones. 



taste-bud. A cluster of chemoreceptors which form a taste-organ. 



Taungs man-ape. A fossil ape skull discovered in South Africa. 



taurodont. With extended pulp-cavity as in some fossil human molar teeth — 

 doubtfully primitive. 



tectorial membrane. The colloidal membrane which covers Corti's organ of the 

 cochlear duct. 



tectum. The roof of the midbrain. 



tegmentum. The gray matter which covers each of the brain peduncles. 



telencephalon. The anteriormost of the five brain vesicles which forms the cerebral 

 hemispheres. 



teloblast cells. The posterior pair of cells which in annelids forms the mesodermal 

 bands. 



telodendria. The motor end-plates or terminations of a neurite. 



tendon. The fibrous attachment which connects a muscle with a bone or other struc- 

 ture. 



teniae coli. Three longitudinal muscle bands of the colon. 



tentorium cerebelli. The dura mater partition between cerebrum and cerebellum.. 



terminal nerve. A ganglionated portion of the olfactory nerve. 



