136 



SCIENCE. 



ly removed from the pcsol. The LaXin pero denoted a sort 

 of boot made of raw hide. 



Pes OLFACTORIUS.— ps. ol. — The firmer ental por- 

 tion of each rhinencephalic lobe. As it is the termination 

 of the crus, and has, in the cat, a somewhat foot-like 

 shape, I suggest the above name for it. 



PlA (mater). — pi— In the cat's brain there are indica- 

 tions of at least two layers of the//<z. 



PONS (Varolii). — pn. — Tuber annulare, etc. There 

 seems to be no need of the qualifying genitive. 



PONTIBRACHIUM. — pnbr. — "brachium pontis;" Spitz- 

 ka, 4, ioo. 



PORTIO DEPRESSA (prasperforati).— Pt. d. — In the 

 cat the (locus) prceperforatus is distinctly divided into 

 two portions, the caudal of which is depressed, while the 

 cephalic is elevated, and sometimes furrowed. Briefer 

 names are desirable. 



Portio PROMINENS (praeperforati). — Pt. p. 



POSTBRACHIUM (mesen.).— pbr. — Brachium post-.nus. 



Pr^ebrachium (mesen.).— prbr. — Brachiutn ante- 

 rius. I have not identified these parts. 



Portiplexus,— ppl.— The small portion of the free 

 border of the velum which hangs in the porta. 



POSTCOMMISSURA. — pes. — Commissura posterior cere- 

 bri. The posterior commissure. 



PiLECOMMISSURA.— pres. — Commissura anterior. 



POSTGENICU LATUM, (corpus).— pgn. — Corpus genicu- 

 latum inter nu7>i. 



PR/EGENICULATUM, (corpus).— prgn. — corpus geni- 

 culatum externum. 



POSTOPTICUS, (lobus).— pop. — Testis cerebri. The 

 caudal eminence of the "corpus quadriganinum." 

 " Postoptic lobe," Spitzka, 4, 100, and 103. 



Postpedunculus (cerebelli).— ppd. — Crus cercbclli 

 ad medullam. Inferior peduncle. 



I'R/EPEDUNCULUS.— prpd. — Crusseu processus ad cor- 

 pus quadrigeminum. Superior peduncle of cerebellum. 



Postperforatus, (locus).— ppf. — Locus perforatus 

 posticus. Posterior perforated space. Pons Tarini. 



Prceperforatus.— prpf. Locus per/, anticus. 



PROCOZLIA. — pre. — Ventricle of the prosencephalon, 

 " Lateral ventricle." 



Proplexus.— prp. — The plexus of the medicornu of 

 the procalia. It is the long free border of the velum, 

 and, still covered by the endyma, enters by the rima. It 

 is continuous with the portiplexus, and extends to near 

 the tip of the medicornu. 



Prosencephalon. — pren. — The cerebral hemi- 

 spheres ; cerebrum less the striatum ; the fore-brain. 



Proterma. — prtr. — The primitive lamina terminalis 

 or /. cinerea. lerma embryonis. My reason for suggest- 

 ing different terms for the adult and embryonic terminal 

 plate, is that, as now understood, the latter includes not 

 only the lamina cinerea of anthropotomy, but also the 

 parts afterward differentiated to form the columna; for- 

 nicis, and the pracotnmissura, with perhaps some other 

 parts of the fornix. 



PSEVDOCiELlA.--pse.— Venlriculus septi pellucidi. 

 "Duncan's hohle," Loewe, A, 13. Fifth ventricle. This 

 is not a.true member of the ccelian series. If it ever pre- 

 sented an opening into the aula, it is because of some in- 

 jury which has torn the brain. This point was urged by 

 me in the unpublished paper No. 4. 



Pulvinar. — plv. — Pulvinar thalami. The posterior 

 tubercle of the human thalamus. 



Quadrans, (cruris cerebri). — q. — In the cat, a depress- 

 ed area approximately equal to the fourth of a circle, upon 

 the ventral surface of ihe crus, in its meso-cephalic angle. 



Radix intermedia (rhinencephali).— -Rx. 1.— The 

 middle root of the rhincncephalon. In anthropotomy, 

 the middle root of the olfactory nerve. In the cat it is 

 little more than a sub-triangular interval between the 

 RR, lateralis and mesalis. 



Radix mesalis.— /to. /«.— The mesal root of the 

 rhinencephalon. The " internal root of the olf. nerve." 



In the cat, it turns pretty sharply from the ventral to the 

 mesal aspect of the brain. 



Radix lateralis. — Rx. /.—The lateral root of the 

 rhinen. The " external root of the olf. nerve." In the 

 cat it presents a gray and a white stripe — limes cinerea 

 and /. alba. 



Recessus AUL/E. — R. a. — A small depression be- 

 tween the two columna fornicis, and ventrad of the 

 crista. The aulic recess. 



RECESSUS conarii. — R. en. — " Recessus pinealis," 

 Reich. A, Taf. ix, rp. 



RECESSUS OPTICUS. — R. op. — This is a pyramidal re- 

 cess, just dorsad of the chiasma, the apex pointing lat- 

 erad. The term is used by M:halkovics, A, 79. 



Kecessus prcepontilis. — R. prpn. — The mesal de- 

 pression which is overhung by the cephalic border of the 

 pons. Its floor is formed by the caudal part of the 

 postperfora tus. 



Regio AULICA. — Rg. a. — It may be convenient some- 

 times to employ this term as a designation for the gen- 

 eral region, of which the aula is the center. Within a 

 short distance of the aula are many parts of great mor- 

 phical importance ; the whole brain seems to converge 

 thereto. Whoever understands the aulic region will find 

 no serious difficulty with the gross anatomy of other parts. 



Restiforme, (corpus). — Rf. — The restiform body of 

 the metenceplialon. 



Rhinencephalon. — rhen. — The division of the 

 brain, which is united with the cephalic end of the base 

 of the prosencephalon, and connected by the nervi oifac- 

 toriz with the nares. Each lateral lobus includes a crus 

 wiih its radices, and the bulbus olfactorius, consisting of 

 the pes and pero. 



Rhinoccelia. — rhc. — The cavity or ventricle of each 

 lateral part of the rhinencephalon, and connected with 

 the procoelia. 



Rima (cerebri), r. The interruption of nervous 

 tissue between the fimbria and the tcema, by which the 

 fold of pia — still covered by the endyma — enters the 

 proccelia to form the proplexus. 



It extends from the dorsal border of the corresponding 

 porta to near the tip of the medicornu. In a general 

 way it coincides with a lateral half of the " fissure of 

 Bichat," or " great transverse fissure." That, in the 

 cat, the borders of this rzma are closely united by the 

 intruded pia, and that the thalamus is wholly excluded 

 from the procoelia, was demonstrated by me on the 25th 

 of November, 187.-, in the presence of my assistant, 

 Prof. S. H. Gage, who rtcorded it at the time. It was 

 affirmed in my lectures on Physiology at the Medical 

 School of Maine in the Spring of 1877, and in subsequent 

 courses there and at Cornell University ; and was one ot 

 the points made in a paper (4) read at the meeting of the 

 Am. Assoc. Adv. of Sci. in 1879. While affirming this 

 of the cat, I stated that ihe material at my disposal had 

 not enabled me to demonstrate it upon the human brain, 

 but there was no doubt that the same condition would 

 be ascertained when a human brain could be prepared 

 and examined with sufficient care with reference to that 

 feature. In the Spring ot 1880, Dr. Spitzka informed me 

 that Hadlich had denied lately the appearance of the 

 thalamus in the lateral ventricle, presumably of man. 

 The fact is, whoever begins his studies of encephalic 

 anatomy with the brains of the lower vertebrates will 

 soon perceive that — excepting for some rupture of the 

 parts — the thalamus can no more form a part of the 

 floor of the " lateral ventricle " than can the cerebellum 

 or any other part of the brain. 



Ripa (delta ).—;/. — The border of the delta formed 

 by the reflection of the endyma upon the intruded auli- 

 plexus. Probably also in man. 



Rostrum (callosi). — rm. — The rostrum of the cal- 

 losum ; much shorter in the cat than in man. 



Septum lucidum, — spt. I. — This term is not only 

 compound, but based upon two misconceptions : that it 



