TRACTELLUM 



1530 



TRANSECTION 



in the cord, the fibers passing to the anterior root, the 

 anterior root and the nerve-trunk to the muscle. T., 

 Myelo-cerebellar. See T. , Direct Cerebellar. T., 

 Olfactory, the narrow portion of the olfactory lobe of 

 the brain. T., Ophthalmic, T., Optic, this arises by 

 two arms or brachia, one from the stratum opticum 

 of the quadrigeminal bodies, the other from the optic 

 thalamus. From the junction of the two arms it 

 winds obliquely across the under surface of the crus 

 cerebi, to which it is attached by its anterior margin, 

 then passes forward, being connected with the tuber 

 cinereum and the lamina cinerea. Finally, it unites 

 with the tract of the opposite side to form the chiasm. 

 T., Peduncular, any tract of fibers in the crus 

 cerebri. T., Posterior Cortical, a tract of fibers 

 passing from the cortex of the occipital and temporal 

 lobes to the nerve-cells in the pons. T., Postpyram- 

 idal, the dorsal pyramid of" the cord. T., Pre- 

 pyramidal, the ventral pyramid of the cord. T., 

 Principal, that portion of the ventral column of the 

 cord not belonging to the direct pyramidal tract. T., 

 Pyramidal, the continuation in the spinal cord of the 

 ventral pyramids of the oblongata. At the decussa- 

 tion of the pyramids about three-quarters of the fibers 

 usually cross to the opposite side. These pass down 

 the cord in the lateral column and constitute the 

 lateral (or crossed) pyramidal tract. Those that do 

 not decussate pass down in the inner part of the 

 ventral column at the side of the ventral median fis- 

 sure and constitute the ventral (or direct) pyramidal 

 tract. T., Radicular, the portion of the spinal cord 

 dorsad of the principal tract. T., Respiratory, the 

 respiratory organs in continuity. T., Restiform, the 

 restiform bodies. T., Semilunar, a semilunar band of 

 fibers in the outer portion of the cerebellar hemisphere. 

 T., Sensory, any tract of fibers conducting sensation 

 to the brain. T., Speech, a group of fibers passing 

 from the cortex of the sub-frontal gyrus of the 

 left side, usually to the nuclei of origin in the ob- 

 longata of the nerves connected with the apparatus of 

 speech. T., Spiral, the spiral impression in the large 

 fossa of the cribriform plate. It is pierced by foramina 

 for transmiting filaments of the auditory nerve. T., 

 Tegmental, a tract of fibers in the tegmentum, proba- 

 bly connecting the olivary body with the mid-brain. T., 

 Teretial. Synonym of Fasciculus teres. T., Tertiary 

 Projection, the peripheral nerves originating from the 

 nuclei surrounding the aqueduct, and from the cells 

 in the gray matter of the spinal cord. T., Uro- 

 genital. Synonym of T., Genito-urinary. T., 

 Uveal. Synonym of Uvea. T., Voluntary Motor, 

 that portion of the motor tract extending from the 

 cortex of the brain to the ventral horns of the cord. 

 Tractellum (trak-tel'-um) [dim. of tractus, a tract://., 

 Tractella~\. In biology, that rlagellum of an infusorian 

 which precedes in locomotion. 

 Traction (trak f -shun) [trahere, to draw]. The act of 

 drawing or pulling. T. -aneurysm, an aneurysm 

 most commonly seen in children, and if seen in 

 adults to be referred to childhood, due to traction on 

 the aorta by an incompletely atrophied ductus Botalli. 

 T., Axis, traction in the axis or direction of a chan- 

 nel, as of the pelvis, through which a body is to be 

 drawn. T., Axis Forceps, an obstetric forceps for 

 performing axis-traction in the delivery of the fetus. 

 T. -diverticulum, a circumscribed sacculation of the 

 esophagus from the traction of circum - esophageal 

 adhesions. T., Elastic, traction by an elastic force. 

 Tractor (Irak' -tor) [trahere, to draw]. I. An instru- 

 ment for making traction. 2. See I'erkitiism. 

 Tractoration (Irak - tor - a' '- slum) [trahere, to draw]. 

 Treatment by metallic tractors ; Ptikinism. 



Tractus {trak'-tus). See Tract. 

 Tragacanth (trag'-a-kanth). See Tragacantha, 

 Tragacantha (trag-a-kan'-thah) [rpay&Kavda ; rpdyofi 

 goat; aaavda, thorn : gen., Tragacant/ue\ The exu- 

 dation of several species of Astragalus found in Asia 

 Minor. A natural mixture of gum arabic and bas- 

 sorin. A demulcent employed mainly as a vehicle 

 for resins and insoluble powders. T., Glycerinum 

 (B. P.), tragacanth, glycerin, and distilled water; a 

 translucent jelly. T., Mucilago, tragacanth 6, gly- 

 cerin l8, water to loo parts. Dose 3J, ad libitum. 

 T., Pulv., Comp. (B.P.), tragacanth, gum acacia, 

 starch, and refined sugar. Dose gr. xx- 5jj. 



Tragacanthin (trag-a-kan'-thin). See Bassorin. 



Tragal (tra f -gal) [rpayoc, goat ]. Pertaining to the 

 tragus. 



Tragalism (trag' '-al-izm) [rpayoc, goat]. Salacious- 

 ness ; sensuality. 



Traganthin (trag-an'-lhin). See Bassorin. 



Tragicus (traj-ik'-us). See Muscles, Table of. 



Tragophonia (trag - off- o'- ne - ah) . Synonym of Ego- 

 phony. 



Tragopodia (trag - op - o'- de - ah) [rp'ayoc, goat ; 

 foot]. Knock-knee. 



Tragus (tra'-gus) [rpayoc, goat]. The small promi- 

 nence of cartilage projecting over the meatus of the ex- 

 ternal ear. 



Trailing Arbutus (tra'-ling ar'-bu-tus). Ground 

 Laurel, May Flower. The leaves of Epigea repots. 

 Diuretic and astringent. It has been used to allay 

 irritability of the urinary organs. Dose of fid. ext. 

 ^ss-j. Unof. 



Train (tran) [ME., trainen, to draw]. A following; 

 that which is drawn after. T.-murmur. See Fisher's \ 

 Murmur in Signs and Symptoms, Table of. T.-oil. ; 

 See Whale-oil. 



Training (tran'-ing) [ME., trainen, to draw]. Syste- 

 matic exercise for physical development or for 

 special attainment. T. -school, an institution where 

 persons are instructed in nursing. The majority of the 

 large hospitals have established such institutions. 



Trait (trat) [Fr. , trait, a line]. Any natural character- 

 istic or feature that is peculiar to an individual. 



Tramosericeous (tram - o - ser - ish'- us) [tratna, weft ; 

 sericeus, silken]. In biology, having a satin-like ' 

 luster. 



Trampling (trand -pling) [ME., trampelen, to trample]. 

 The killing and bruising of animals in conveyance by 

 rail or sea by being thrown down and trampled upon j 

 by the feet of their companions. 



Trance (trans) [transitus, a passing or passage]. I. A 

 form of catalepsy, characterized by a prolonged condi- 

 tion of abnormal sleep, in which the vital functions are I 

 reduced to a very low minimum, and from which the j 



• patients ordinarily cannot be aroused. The breathing 

 is almost imperceptible, and sensation is abolis 

 The onset and awakening are both very sudden 

 The state of syncope much protracted. T.- doctor, 1 

 mesmerist. T., Hysteric, the trance-like condition 

 sometimes met with in hysteria. 



Trans- [trans, across]. A Latin preposition used as a j 

 prefix to denote across. 



Transcendental (tran-sen-den'-tal)[trans, acros 

 dere, to climb]. Beyond the bounds of experii 

 T. Anatomy, philosophic anatomy. 



Transductor (trans - duk> '■ tor). Synonym of ■ 

 versus pedis. 



Transect (tran-sekt f ) [trans, across ; secare, to cut]. , 

 To make a transection. 



Transection (tran-sek' -shun) [trans, across ; 

 cut]. Any section made across the long axi 

 or of the whole body, in the latter case dividing it into 



