486 ANATOMICAL TECHNOLOGY. 



Area ovalis. The pyramids are commonly regarded as continuations of the lateral rather 

 than of the ventral columns of the myelon. 



The use of the short term pyra mis was suggested by Spitzka (7, 165). 



The " decussation of the pyramids " does not appear at the surface, but maybe demon- 

 strated by divaricating their caudal portions. 



§ 1299. Quadrans, q.—Fig. 118 ; PI. Ill, Fig. 9, 11 ; § 1144. 



This name was proposed by the senior author {!), 136 ; 14, 544) for an area of the ven- 

 tral aspect of the Crus cerebri which is approximately the fourth of a circle. It is not 

 always distinctly marked. 



§ 1300. Radix intermedia (Cruris olfactorii), Ex. in. — Gray, A, 638 ; Quain, A, 

 II, 537. 



Syn. — Radix media, the middle root of the olfactory tract. As stated in § 1161, it is 

 not apparently differentiated in the cat. 



This and the two following technical terms for the olfactory " roots " were proposed by 

 the senior author (.9, 136 ; l-l, 538) as less apt to be misunderstood than the current ver- 

 nacular words. 



§ 1301. Radix lateralis (Cruris olfactorii), R.v. l.—F\g. 116 ; PI. II, Fig. 3 ; g 1161. 

 Gray, A, 638 : Quain, A, II, 536. 



Syn. — Radix externa, external root of the olfactory tract. 



See Limes alba, § 1250. 



§ 1302. Radix mesalis (Cruris olfactorii), R.t. ms.— Fig. 116 ; PI. II, Fig. 8, 4; §1161. 

 Gray, A, 637 ; Quain, A, II, 537. 



/Sy«.— Radix interna, inner or internal root of the olfactory tract. 



In man this root is wholly ventral in position, but in the cat it passes obliquely mesad 

 and is continuous with the region between the postradical and praeradical fissures. 



§ 1303. Radix motoria (Nervi trigemini), R.v. mt. — The smaller motor root of the N. 

 trigeminus ; see Chap. XI and PL II, Fig. 3. 



§ 1304. Radix sensoria (Nervi trigemini), Rx. sn. — The larger and sensory root of 

 the N. trigeminus ; see Chap. XI and PL II, Fig. 3. 



§ 1305. Recessus aulas {az.), R. a.-Fig. 117; PI. II, Fig. 4; PI. IV, Fig. 14; § 1172. 



The slight space between the Columnfe foruicis just ventrad of the Crista and dorsad 

 of the prsecommissura. Its cephalic wall is exceedingly thin and has not received a special 

 name, but is evidently a part of the original terma. 



§ 1306. Recessus opticus {az), R. op.—F\g. 117, 118 ; PI. II, Fig. 4 ; PI. Ill, Fig. 11. 



As best seen in PL III, Fig. 11, there is a distinct recess just dorsad of the chiasma on 

 each side. It seems to correspond with what Mihalkovics (A, 79) calls by the name above 

 given. Together they constitute the ventro- cephalic part of the aula. 



§ 1307. Recessus prsepontilis {az.), R. prpn.—F\g. 116, 117, 118 ; PL II, Fig. 3, 4 ; 

 PL III, Fig. 11. 



This name was proposed by the senior author (0, 136 : 14, 538) for the mesal pit 

 formed by the overhanging of the cephalic border of the pons ; it is sometimes quite deep. 



§ 1308. Regio aulica (az.), Rg. a. — This name was proposed by the senior author 

 {9, 136 ; 14, 538) for the complex region about tlie aula. Within a radius of 1 cm. from 

 the Crista fornicis occur a large number of parts the structure and relations of which are 

 inadequately known and far from easy to elucidate. 



§ 1309. Restiforme (Corpus), rst.— Gray, A, 611 ; Quain, A, II, 505. 



Syn. — Crus e cerebello ad medullam. 



This part of the metencephalou is not distinctly shown upon any of the figures, and we 



