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Show -‘M- 104+ 0f the 099807)) Name; of flilimalr. Book III. Book III. running all the length of the Glands, do make diVerfe flagnients of a cir._ cle, whofe lnterfiices are filled up with many Glandulous lubftanees. c H AP. -ET‘ 6:. f. r. l' l H LIII. In :1 Thornback alfo the Olfactory Nerves + branch themfelves out of the corners of the tranfverfe ProceiIes of the Bram, and thence make an a overthwart progrefs toward the fides of the Skull, wherein Perforations Rd- in 'lhctnhatlc Office Optick Mme: of Man, and other fl'm'nm/r. being cut, through which thefe Nerves are conveyed to the Organ of Smelling, making long White Prominencres on the top ofthem. Tr:0igans cl Smelling i ,i liliornhark. 'r IIII. The Organs of Smelling in this Fifh, are covered With a blackifh Mem. branc 1- through which may be difcovered, as through a thin Vail, many whitifh I‘treaks, which are the glimmerings of many finall Fibres, lying un. der the Membrane. Thefe Smelling Organs are feated below the Skull near the Mouth, , in oblong Cavities, arched above, and on each fide with {mall numerous Fibrils, ranked in a beautiful order, and propagated on each fide from the Trunk of the Olfactory Nerves, paHing over the middle of the Con. vex Surface of thefe Organs, whofe Concave parts are for the mall pm clofed below with Two membranous flaps, having on each fide a flraight paiiage, leading into this arched Cloflet, the Organs of Smelling in :1 Skate, Thornback, Flaire, and the like great fiat Fill]. HE Second pair of Nerves called the Optick "l- is Very large and of Tl‘coptit; a loft Compage, compofed of many Filaments, enwrapping in their it??? inmol't Receflies a Medullary fubflance. , . Diemcrlrueck affigneth their Origen to the Cvrjlol‘d flriata, feared in the Third Ventricle. This Author faith, that the outward Coat of thefe Optick Nerves is expanded about the fireaky protuberancies, and is f0 blended \Vlth their fubflance, that their Fibres are united to each other 5 but I humbly C0n~ ceive it more agreeable to Autopfy, to derive the rife ofthe Optick Nerves Therif'cofth" lrom the Mzdu/la ablmrgala, which thence pafs obliquely forward and in- 03'" ward, near the CDVPOVLIflI‘iIItd. The Right Nerve, according to Vdflrliur is MW". carried toward the Left Eye, and the Left Nerve toward the Rich: Eye dud alittle defcending with a circumference, do meet about the IIIfimrlibiilum where they are united, not only by a decuflation, but by an intimate emf bodying each others lhbflaiice, as Mercatm, Sennertm, ‘Baubinm, and other Learned Anatomil'ts will have it : But it may feem more probable and con- ""01"" illitnniiriiii. ili‘giiigiiidi, c'" A u fonantto Senfe, that the Optick Nerves are only conjoyned by Membranes in a fimple Contact, and not by any confufion offubf'cance, as it is confirmed by the obfervations of many Learned Anatomil'ts. Ve/Zzlim', Aquapmdenr and Vale/crab: have obferved the Optick Nerves to be parted in their whole, courfe, from the Brain to the Eye, In adolefceme ner-vor wifiwior conga/fit in- wtcw non mum/ti, 71eq;fefi contingerc widimm, faith Veflxlim, Et ipfnm ale wifia mmgnammnqmflum fiufle wifu pmflami femper wa/mfl‘e (y fizmilz'are; ale rw'foa rmn duplicatione nibil tin/[1mm ~z'ntelle‘xifle. The Qprick Nerves after they are united, part again, and on each fide, are tranlmitred through holes of the 0: Sp/mnoeic/er, and inferred fomewhat I'ltetallyiiito the Coats, near the center of the Eyes in Men, at 1219: deter» mining into an expanded foft Membrane, upon which vifible objects make their appulfes, immediately producing Sight. In alfiih called a Bale, the Optick Nerves interfeél each other, and do not 1"!"er at all mingle with each others Subl'tance and Filaments, but only the out. 1333:: inter: ward Coats do clofely conjoyn near the Bone feared in the midddle of the $25.3"! Brain. which on each {Ede enclofeth the gtearefi part of it 5 and the Optick I\C'rves allo in a Gurnet do deculIate each other, the Left Nerve pafling to the Right Eye, and the Right Nerve to the Left Eye. E'lfldf/Jiw found out the Optick Nerves all made up in folds, after the manner offine Linnen Cloth. 177 optico ail illefc compermfléjcilitet mm complimnim eflé, weluti temu' mmm matronamm human in rugar immmerdé WWI", pm [me difiri/mtay, (9v timimld e45 ambiente [0461mm qua imifa EWOl'I/i, (-7 in "WP/""1 Membramm tor/rm txp/icari Fifi}. . The Optick Nerves in a Buftard do fpring out ofTwo oval Proceffes, eon; Tyson‘s?"{:ytnid to the Bafe of the Mean/14 oblrmgam) and do. clofely unite themfelves 133$:ij tin ut any decufsation, and then after a little Ipace are dlvrded, and pal; gobhquely, do inlert mto the infide of the Eyes. The V |