OCR Text |
Show 0f the Shell. Book III. ter is lodged in thole Caverns, which if tranfmitted to the Eyes, Would darken the Sight, and by {tifiiing them, would render them uneafy, in reference to their quick turnings, to view Obyeé'ts in indifferent Situa. tions. Others conlign their: Cavities toa noble end, to prepare the Air for the produétion of Animal Spirits, to which no rational Man can eafily alltnt, leeing the purity of it mull be rather leflened then advanced, as being annoyed (in its pallage into the Brain) with the impurity of mucous Becrements, often lodged in thefe Caverns. Learned Higbmoye conceiveth, that Nature framed them to conflirute the Eminencies and Protuberancies of the Eye-brows, which give a grace to the Face, and a defence to the Eyes; It may be thefe Cavities are {1-3. med to make a diverfion of ill Smells, that they lhould not give too great a linprize and trouble to th: Brain. Tbctvusufc Burl conceive the molt probable ufe, that may be afligned to theft 1";"5," Caverns, is that they are Receptacles of mucous Matter, in that they hold an entercourle with the Brain, by palTages conveying exercmentitious Matter from the Ventricles of the Brain, {trained through the 0s Cribriforme, and tranlinitted into thefe Cavities, and from thence by another pailage conveyed into the Nofirils, and from thence dilchai'ged the contines of the Body. may/3:10" The 01/31 Simipifts 1- feared on the top and {ides of the Head, if conrm-iw, fidered fingly, have an unequal (luadrilareral Figure, and if )oyntly ta- ];T‘M'E'J' ken, are enclned with a Semi-circular Convex form; and have 3 Connexion before with the Bone of the Forehead, and behind with the 0r- rz'put, by the Lamdoidal Suture; and on the rides with the Bones oldie ;',‘l;‘,(n*‘\"l:‘;,‘jff Temples, by Squammous agglutinations. Tliele Bones are more thin then any other part of the Skull (Where- Book III. 0f the Slips/l. 93" their progrefs (contrary to the 0; Frrmtir, from the Center to the Cir. cumfcrence. .. . . . i . y In the Sixth and Seventh Months the Sutures are formed and begin "WW3" {omewhat to clofe, being loofely conjoyned per Harmonimi, but their Sign edges confining on the 0: Cumifbrme, and Temper/4m, retain their lirlt membranous Nature; whereupon the Bones being feparated one from ano~ ther, there appeareth a great aperture, which difappeareth in the Eighth . or Ninth Month, as the Bones of the Sinciput are pcrfefily' united with the 0: Sphenaider, and Temporum. ‘ The OJ Occipiti; is made up ofthe hinder and lower parts of the Skull Thecompefw and is one Bone in perfons of ripe age, except very rarely, when there; 33;;th is a Lufm Natum in thofe who have a melt {pacious hinder part of the Skull ‘ which is then compounded of many Bones, after a different manner, divi.' ded with Sutures of various lhapes: It is common in Infantsto find many Bones in the hinder region of the Skull, which are Six or Seven, accord- ingtofome Anatomil'ts: But Learned Fallopim affirmeth, he could never difcern above Four. , . . . _ , , The 0: Occipili: is beautified with a Triangular Figure, and is Con- Tthigurc or vex without, and Concave within, and is endued with a harder and thick- 3,205 0"" er Compage, then any other part of the Skull, by reafon we are often . furprized with dangerous falls backward, againft which we have no defence, but the hardnefs and thicknefs of the 0: Occipilir. This Bone hath a Connexion above with the SPIJL'naidef, and is adorned T"CC°.""~"E" with Nine Sinm, of which Two are‘Engraven in the lowa part, about 3:35.!" the (ides of the great Foramtn; in the inward Surface of this Bone, are 5m ,feated Seven Siam, of which the Two lowell and greatel'c are repofito- "f 5":qu ties, to receive the Protuberancies of the Cerebellnm. "my". Near thefe Sinm appear Two other, on each fide the Octiput, which U: Menu- upon \Vounds prove here molt fatal) and are {oft and membranous in afcend obliquely from the 01]}: Temporum, and pals crofs the 0: Occipiric, in Whole Center do meet, and are entertained the Two lateral Sirzur of the Infants, principally about the Commiflbres of the Coronal, and Sagittal- 3 Dim: Mater; from thefe a Third Ptraight Simu ‘climb'eth up to the Oflk Sin? Sutures, by realon of an exuberant moilture, caufing an Hiatus, called tipixirhreceiving the upper and great Sinus of the Dun: Mmymc : At the d'ifllhlllCl/J, which is afterward iudurated into Bones. illil'liilmm The {0(de oi thele Bones rarely continueth in peilbns ofmature 50158 of the right Sinm are placed Two other Simir, giving‘recepti‘on to both the hinder Protuberancies of the Brain. , diachronic age, though chmt-rZ/roerl'x reporteth, he law a PontaI/el in a l'erfon ol Honour, Forty years old; And Li/zdanu! giveth an account of the Laxity of thele Bones in a Woman of Thirty years, who upon the Headach, or in time of her Travel, had the Coronal-Suture opened a Fingers breadth; lb that the pullation of the Arteries in the Dam Mater might eafily be difcetned. Iconceive a double life may be alligned of this Hiatus or Cavity in Infants, the Firlt may be to exonerate their moiPt Brain, as clogged with gtols Vapours , breathed through this membranous fubfiaiice. Secondly; frnooth Cartilage from the Siam of the firfi,Vert,ebm,waiting upon the articula- "mm" tron of the Head: Thefe dilizinétly oppofitc Procefles, Two other Prominen. €165 attend ; lb that in the fame place a Bone is outwardly and inwardly protuberant. To theft: Proceffes may be added the Fifth and» greateft, giving m, Fifth lirength to the inferior Region of this Bone, where it is {lender and Weak, Emmy?" which afcendeth inWardly upright from the great Faramerz, dividing the TWO That the-1e tender gaping Bones may be drawn clofer together, t0 gran" Ptotuberancies of the Cerebe/lum. more eal'y paflage to the Head in the time of Birth, through the {traighl he 0: Occipitic hath Five Fammilra, one of which is the lower and {hit i} ;, greateft, and through it, the Medulla Spindle is conveyed, and at the {ides of 33:3." Bones of the Hypoga/frium. 361.3%sz \ In the Three Firllz‘ Months, the Offa Sincipitir, or Side-bones 0f the ainrzfnii, At the lick: of the great Forum", through which the Spinal Marrow is Two Pratcf‘ tranfmitted, are feated Two Procefles looking inward, which are accompa- iiiricim" Skull, have only their rough draughts, wherein they appear membfa' nous firlt, and afterward Cartilaginous, and have only (bme oblcurc pom" as To many glimerings through a Cloud, belpceking the CartilaginoUS fnbfianee 0f the 0J4 Sintipitid, which afterward in the Fourth and Fifi Months, are intermediiilly fiep by Rep turned into Bone, and begin their ‘ med with Two other fmaller ones, tending ~, all which are received with a W, 05,5, , thls great hole, are placed two other, to give a paITage for the Seventh pair . °fNerVeSa and to the Artery and Vein belonging to the Head. N0: far from the {ides of thele holes, under the 0: ‘Petrqfum, between the Occiput and the Procefl‘m Stiloider, is placed an oblong Penman, afford- {331 Way t0 the fin": pair of Nerves, and the carodi-te Artery, and jugular em. 0 lr T"? |