480 ANATOMICAL TECHNOLOGY. 



1243. Hypocampa, hmp. Fig. 122 ; PL III, Fig. 11 ; PL IV, Fig. 14, 15, 18, 19 ; 

 1147. Gray, A, 627 ; Quaiu. A, II, 541. 



tiym. Hipi>ocampus major, cornu Ammonis. 



A thickening and involution of the parietes of the medicornu, forming its floor. 



The convexity constituting the hypocampa corresponds with a well-marked ectal fissure, 

 the F. hypocampa. The ectal surface also presents ikefasciola, fiinbria and F. fimbria. 



The grounds for preferring the name employed by Vicq d'Azyr (A, 61, PL VII, Fig, 

 1, 3 ; PL VIII, Fig, 2), and ascribed by him to Arantius and Varolius, are briefly stated by 

 the senior author (9, 125 ; 14, 541). 



1244. Hypophysis (02.), hph. Fig. 111,112, 116, 117; PL II, Fig. 3, 4 ; 1084. 

 Gray, A, 621 ; Quain, A, II, 535 ; Balfour, A, II, 358. 



Syn. Corpus pituitarium, pituitary gland. 



A subcordate mass attached to the Tuber cinereum by a tube, the infundibulum. It 

 does not appear to consist of true nervous tissue, and its functions are wholly unknown ; 

 but it is constant throughout the vertebrate series, excepting Amphioxus ; see Owen, 1. 



1245. Incisura hypocampae, Inc. hmp. Fig. 118 ; PI. IV, Fig. 11. 



A more or less distinct crenation of the mesal border of the hypocampal lobule, wher'e 

 it abuts against the Tractus opticus. 



1246. Infundibulum (az.\ inf. Fig. 116, 117 ; PL II, Fig. 3. 4. Gray, A, 621 ; 

 Quain, A. II, 535. 



The short thin-walled tube by which the hypophysis is connected with the Tuber 

 cinereum. 



It has several antiquated synonyms, but the name here given is almost universally 

 employed. 



1247. Insula, ins. Gray, A, 616 ; Quain, A, II, 525. 



Syn. Insula Reilii, Gyri operti, Lobulus Fissurae Sylvii, Lobulus Corporis striati. 



In man and monkeys, and perhaps some other mammals, the cortex cerebri opposite 

 the striatum is elevated and more or less convoluted. By the subgrowth of the neighbor- 

 ing regions, it becomes nearly or quite concealed, whence the name Gyri operti. The 

 insula has not been identified in the cat ; see striatum, 1318. 



1248. Interopticus, inop. The interoptic lobe of some Reptiles (Spitzka, 4, 5, 11}; 

 we have not observed it in the cat. 



1249. Iter (az.\ it. See mesocrelia ( 1263). The entire name is iter a tertio ad 

 quartum ventriculum, but as the only other iter (iter ad infundtbulum) is rarely used, the 

 senior author has suggested (f>, 135) the single word as a convenient designation of the 

 contracted mesocoelia of mammals. 



1250. Limes alba, Im. a>0>. Fig. 116 ; PL I, Fig. 2 ; PL II, Fig. 3. 



The Radix lateralis of the olfactory lobe presents two distinct tracts or paths for 

 which, from their color, the senior author has proposed (f>, 135 ; 14, 537) the names limes 

 alba and limes cinerea. The latter is laterad of the fornix. 



1251. Limes cinerea, Im. cin. See limes alba (% 1250). 



1252. Liquor cceliarum, Iq. e. The liquor ventriculorum cerebri. The coelian sur- 

 faces are always moistened by a serous liquid, secreted presumably by the plexuses. We 

 have never observed an abnormal increase of this liquid in cats, but hydrocephalus has 

 been recorded of several domesticated animals as well as of man. 



1253. Lobulus appendicularis (cerebelli). U. op. Fig. 116 : PL I. Fig. 2 ; PL II, 

 Fig. 3. 



The name has been applied to the more or less distinct projection consisting of two or 



