140 Glossary 



Su"prare'nal. [L. supra, above ; renes, the kidneys.] 



Sus"tentac'ulum, -ula. [L. sustenare, to hold up.] A sustaining structure or part of 

 an organ. 



Syl'vius. Latinized name of Dubois, a French anatomist. 



Sympathetic. [G. sympaiheia, sympathy.] Applied to the division of the nervous 

 system which was supposed to coordinate the viscera and the organs of circu- 

 lation ; I. «., to cause them to act in " sympathy ". 



Syn'apse (also written synap'sis), synap'ses. [G. syn, together; aptein, to join] 

 Neuron junctions of a functional sort (not structural). 



Syncytium, -ia. [G. syn, together, + cyt-, q. v.~\ A group of " cells together," i. e., 

 anastomosed or structurally joined. 



Tarsus. [G. tarsos, a broad, flat surface.] The instep. 



Tegmen'tum. [L., a covering.] The dorsal part of the crus. 



Tel"enceph'alon. [G. telos, the end, final ; enkephalon, the brain.] The farthest, or 

 end-brain ; the hemispheres. 



Ter'tius, a, um (ter'shius). [L.] Third. 



Tet'anus. [L., fr. telanos, a stretching, tension; a spasm.] 



Te'res. [L.] Round, smooth. 



Thal'amus, -ami. [L., fr. G. thalamos, an inner chamber, a bedroom.] Primarily, 

 the part of the brain from which a cranial nerve emerges; then specifically,' the 

 important structure from which the optic nerve arises. 



The'ca, -cae (-see). [G. theke, a case, box.] The sheath of any one of various 

 organs. 



Tho'rax, thora'ces. [L.] The upper bodily cavity, enclosed by the ribs, and contain- 

 ing the heart and lungs. 



Thorac'ic. 



Thy'mus (thi'mus). [G. thymos, thyme (time): the thymus gland.] Supposed to 

 resemble a bunch of thyme. 



Thy'roid (also formerly written thy'reoid). [G. thyreoeides, shield-shaped.] Term 

 applied first to the thyroid cartilage, and then to the gland near it. 



Trifa'cial (-shal). [L. tri, three; fades, face.] The trifacial nerve has three main 

 branches. 



Trache'a (trake'a; also tra'chea). [G. iracheia arteria, the "rough artery"; the 

 windpipe.] So called from the rings of gristle surrounding it. 



Trigeminal. [L. trigeminus.'] Threefold. 



Trochlear. [L. trochlea, a pulley.] Applied first to the troclear muscle, or superior 

 oblique muscle, of the eyeball, whose tendon runs through a pulley or loop 

 which changes the direction of its pull : applied then to the nerve which sup- 

 plies this muscle. 



Tu'ber, -bera. [L., a bump or swelling.] A rounded part; an enlargement or knot. 



Tuber'culum, -cula. [L., a little tuber.] A tu'bercle or tu'bercule. 



Tu'nica. [L., a tunic, or garment.] A covering, integument, or enveloping membrane. 



Tym'panum, -pani. [L., a drum.] 



Ta'gus, -gi. [L., wandering.] The nerve which "wanders" from the cranium into 

 the thoracic and abdominal cavities. 



"Ventric'ulus, -uli. [L., belly, stomach; literally, little belly.] A ven'tricle. A small 

 cavity. 



Vis'cus, vis'cei'a. [L.] An organ of the thoracic, abdominal, or pelvic cav'ty. 



Vit'reous. [L., fr. vitrum, glass.] Resembling glass. 



