APPENDIX III 381 



SQUAMA (L. a scale), a combining form; squamous epithelium. 



Squamata (L. squama), an order of reptiles including the lizards and 



snakes; it is sometimes divided into Lacertilia and Ophidia. 

 STAPES (L. a stirrup), one of the ear ossicles; the name is descriptive of 



the shape in the mammal. The stapes is homologous with the 



columella, and originally the hyomandibular. 

 STEGO (G. cover), a combining form; Stegosaur, covered with plates. 

 Stegocephalia (G. stego, plus kcphalc, head), an extinct order of am- 

 phibia; the group from which the more recent ones developed. 

 STERNO (G. breast), referring to the breast. The sternum is the unpaired 



bone in the median ventral line to which the ribs arc attached. 

 STOMA (G. mouth), a combining form; stomodcum, nephrostome. 

 STOMODEUM (G. stoiiia, plus daio, divide), the ectoderm-lined region 



of the mouth cavity. 

 STRATUM (L. spread out, from sterno, to spread). In anatomy, a layer or 



sheet of tissue, as stratum Malpighii. In geology, a layer or sheet of 



sedimentary rock. Stratified refers to a series of layers, one above the 



other. 

 STRIA (L. a furrow), used alone or as a combining form; corpora striata; 



striated muscle. 

 SUB (L. under), a prefix impMng under the following stem; subintestinal, 



subcla"\'ian. 

 SULCUS (L. suico, to plow), a groove or furrow of the brain. 

 SUPER (L. over), a prefix; superior. 



SUPRA (L. above), a prefix; supraorbital; supraoccipital. 

 SYM, SYN (G. together), a prefix; synotic, sympathetic; syncytium. 

 SYMPHYSIS (G. sym, plus phijo, to grow), a union between two parts; 



pubic symphysis. 

 SYNOTIC (G. syn, plus otikos, ear), the cartilaginous connection between 



the otic capsules in the chondrocranium, bounding the foramen 



magnum. 

 SYRINX (G. pipe), the voice box of the birds, located at the bifurcation 



of the trachea. 



TELEO (G. teleos, whole), a prefix; Teleostei. 



TEMPORAL (L. tempus, temple), the region of the skull dorsal and posterior 



to the eye. 

 TENDON (L. teiido, to stretch), a connective tissue band attaching a 



muscle. 

 TENTORIUM (L. tcntori, spread like a tent), a partition of the dura mater 



pushing between the cerebellum and the cerebral hemispheres. 

 TESTES (L. testis), the male reproductive glands; the testis is the gland; 



the testicle is the gland with its accessory structures. 

 THECODONT (G. tJieke, a case, plus odous, tooth) ; referring to teeth which 



are embedded in sockets. 

 Therapsida (G. theros, a wild beast, plus apsis, an arch), an order of 



extinct mammal-like reptiles with heterodont dentition. 

 Theromorpha (G. theros, beast, plus morphos, form), an order of synapsid 



reptiles, less mammal-like than the Therapsida. 

 THORAX (L.), the anterior part of the body enclosed by the ribs, a term 



of mammalian anatomy. 



