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Show 954'I h:- Fairnnmm is Mgr» ly Rnfible, as a contexrurc of Nerves. The {itualion of the Pan‘oylium. 0f the Pericranium and Perioftium. Book [I], Book III. it mofl acutely fenfible: And therefore great care mUR be taken in wounds of the Head, (lefl; except when upon great occafions of Fillutes and Fractures, the Skull mufl: be laid bare) that we hurt not the 'Peritranium a contexture of many Nerves; whereupon violent pains of the Head, and other grievous Symptomes often fupervene: and an Inflammation of the Perim. win»: is readily derived to the Dura Mater and Brain, by the entercourfe of Fibres, by which they highly correfpond with each other, Hence great wounds and Contufions of the temporal Mufcles prove fatal, in reference as well in Nature as Situation) and is affixed to it in its upper Region, This thin Expanfion is afine Tunicle , as being a rare Contexturc made up of many nervous and membranous Filaments finely fpun, and our rioufly interwoven, fo that their Commifl‘ures are {0 clofely conjoyned, that they cannot be difcerned by a moft quick Eye, and feem to be one entire fubltance. The Cranium feerneth to be fenfible in mofl acute manner, by reafon of this curious Membrane (encircling it) as furnifhed with many {mall nervous Fibrils. The ‘Periaflium as well as the rPerm-atrium is endued with many {mall Branches ofBloodAvelTels, Arteries from the external Carotides, and Veins from the outward Jugulars, which import and export vital Liquor, to and from the medullary fubl'tances of the Cranium, and hath Nerves derived to The Nerves of it. XXVI. 0f the Skull; to the (Peritranium, with which for the mofi part they are invefled. The 'Periojiimn adjoyneth to the rPerimmz'mn, (as having much afiinity, and bath its Concave-Surface fal'tened by many fmall Ligaments [Othc Convex of the Cranium. The Blood. veil'els of rhc .Pzrixylr'um. C H A P. it from the Pericranium, which is aff'eéted with Nerves, tranfmitted from the Third pair of the Brain, and from the Firfi and Second conjugation of the Neck. Conceive it Methodical firfl: to give you a Narrative of the Origen of the Skull, and of its Sutures and Laminar, and Meditullinm, and afterwardI will {peak more difiinfily of its lefler parts. Andit {cemeth not unworthy our Confideration, that the Skull in an Emi The origen of brya in its firfi and ruder draught is Membranous, being formed of the more 5kull. viicid part of the Seminal Liquor pafling to the ambient parts of the rudiment of the Brain, and after the thinner and more watry parts being breathed out, the membranous parts of the Skull grow more folid, and turn Cartila- inous, and at lafl: greater and greater Evaporations being made, the faline and earthy Particles grow more predominant, and the grifly com‘page of the Brain-Pan is turned bony, which is very tender in its firfi production, but afterward by the acceflion of new {aline and earthy Particles, and the aqueous parts of the new formed Skull being continually evaporated, the Concretion roweth by intermedial Preps more hard and folid, efpecially in the inward Table of the Skull, caufed by the more grofs faline and earthy parts (lodged there) and more highly Concreted, than in the outward Lamina. The Skull is The Skull being framed of many Bones (to prevent great fractures) con- framed ofmajoyned by divers Sutures, inferting themfelves into each others embraces, after the manner of indented Procefles ; Sutures are either proper, or common, ny Bones con- joyned by Suturcs. the firft connect the upper bones of the Skull, and the other are common to the Skull and lower Jaws. The proper Sutures, may be taken in a double notion, the firIt are true, the fecond fpurious: The true Sutures, have an articulation after the manner of a Saw, wherein the Teeth of the Bones belonging to the Skull, are [0 clolély engrafted into each other, that they cannot eafily be fevered. The fore is called the Coronal Suture +, Iliyled by the Arabians, Amalia, +71 b 5 b 46. FA. by theGreekr, mama, by reafon either it encircles the Skull like a Crown, The 'Coronn Suture. or elfe it isthe place, where the Crown ufeth to be feared on the anterior region of theHead, and pafleth from one Temple to the other crofs-ways after a Semicircular manner, whereby the Bones of the Forehead and Synciput are conyoyned. The ufe of this Suture is to joyn the Bone of the Forehead with thof'e of Fhe Synciput, and to {ever them one from another, as being difliné‘t Bones ‘" themfelves, and only united by the interpofition of the Coronal Suture. To this is oppofed the Lamdoidal Suture 'l‘ ( {cated in the binder part of 1 1'. 45. 17.». s 1. the Skull) fo called, as the Antients imagined, from the likenefs it bath Partof the Lamdoidal with the Greek Letter 1" It is alfo named by the Greekt, mew, and by the Suture. Lhmgfallpmm futura, the Stern Suture, as lodged in the poflerior region of t C u . . This Suture afcendcrh in the bale of the Octiput near each Ear obliquely In [Everal crooked lines, which do Concenter at 1219: as it were in one angle ; fOmetimes when the Occipnt is large, it is divided by one or tWo traflfVEFfC rI Sutures, |