476 ANATOMICAL TECHNOLOGY. 



Syn. — Crus foruicis anterius, anterior pillar of the fornix. 



The fibrous fasciculus which forms the cephalic boundary of the porta, extends ventrad 

 to the albicans and dorso-caudad as the lateral half of the body of the fornix. The columna 

 is a differentiated part of the embryonic terma and is continuous with the hemiseptum. 



The two columnae are separated by the Mecessus aula and conjoined by the CommUsura 

 fornicis. 



% 1208. Columna lateralis (myelonis), Clm. l.—¥\g. 104, 112 ; PI. I, Fig. 1, 2 ; PI. II, 

 Fig. 3. Gray, A, 605 ; Quain, A, II, 494. 



The lateral white column of the " cord." 



§ 1209. Columna ventralis ^myelonis), Clm. c— Fig. 112 ; 116 ; PI. II, Fig. 3 Gray, 

 A, 605 ; Quain, A, II, 494. 



The " anterior white column of the cord." 



§ 1210. Commissura fornicis {az.), Cs.f.—Fl IV, Fig. 14. 



This name was provisionally applied by the senior author {14, 543) to what appears in 

 some preparations to be a transverse band jxist ventrad of the crista fornicis. 



§ 1211. Commissura habenarum {az.), Gv. h.—Y\g. 117; PI. II, Fig. 4; PI. Ill, 

 Fig. 6 ; § 1143. 



A narrow band of apparently nervous tissue connecting the caudal ends of the habenae 

 and constituting the cephalic boundary of the Foramen conarii. 



§ 1212. Conarium {az.), cn.—¥\g. Ill, 112, 114, 117; PI. II, Fig. 4 ; PI. Ill, Fig. 7, 

 10 ; §§ 1084, 1143. Gray, A, 630 ; Quain, A, II, 549. 



&yn. — Glandula pinealis, epiphysis cerebri. 



A suboflobular mass forming a part of the roof of the diacoelia just cephalad of the 

 postcommissura. There is no good evidence of its true nervous structure, and its functions 

 are unknown. 



§ 1213. Cortex, ctx.—Fig. 123 ; PI. II, Fig. 4 ; PI. Ill, Fig. 13 ; PI. IV, Fig. 15, 20 ; 

 § 1147. Gray, A, 623 ; Quaiu, A, II, 521, 559. 



The ectal cinerea of the cerebrum or cerebellum, more commonly of the form-er. It 

 consists of several more or less distinct layers, whose structure and relations are figured 

 and described by Meynert (Strieker, A, 660) and Bevan Lewis {1, 88). 



§ 1214. Crista fornicis {az.), Crs.f.—F\g. 117 ; PI. II, Fig. 4 ; PI. Ill, Fig. 13 ; PI. IV, 

 Fig. 14, 16, 20. 



A hemispherical or semioval elevation of the caudal surface of the fornix just dorsad of 

 the Recessus aulse, between the portae and opposite the cephalic convexity of the medi- 

 commissura. It is continued dorso-caudad as the carina. 



The crista seems not to have been observed prior to the senior author's paper (7). He 

 has observed it in the brains of a sheep and human subject, but has not looked further for 

 it. Probably it will be found in most if not all mammals. Its histological composition, 

 function and morphological significance are unknown. We can only surmise that it may 

 mark the dorsal limit of the primitive terma. 



§ 1215. Crus cerebri, Cr. cl.—Fig. Ill, 112, 116-118; PI. II, Fig. 3, 4 ; PI. Ill, Fig. 

 9,11. 



Syn. — Pedunculus cerebri, caudex cerebri, crus anterius medullae oblongatte. 



The fibrous mass forming with its fellow the support of the mesencephalon and dien- 

 cepha^on, and extending from the pons to the chiasma. 



§ 1216. Crus olfactorium, Cr. o/.— Fig. 116, 117, 124, 125 ; PI. II, Fig. 3, 4 ; PI. Ill, 

 Fig. 5 ; § 1139. Gray, A, 620, 637 ; Quain, A, II, 566. 



Syn. — Crus rhinencejihali, Owen, A, I, 298; olfactory nerve or tract, Quain, A, II, 

 566 ; Gray, A, 038. 



