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The Brain

The Brain image
Parent Issue
Day
19
Month
September
Year
1846
Copyright
Public Domain
OCR Text

pceriiig ïniu inc itumuii sauii 111 au me ui ui etio nap,, and .ihus desehbes i:s appearïrst. The Brtrin-has four diatinet npnrtmentB. largcr brain, or Ccrtbmm, is situaied ai the ind extends 'tó ■the front of ihe-bead. ita es are a great deal larger and more round ihose of the brain ; conscquently it , sses more subátnnce. ■ The lesser biain lic i i bacl; pari of ihfcheau ; - this brain is diinto tvo -cavitiea of dcparimenis, and is,, i 4 áted by a slrong, - membraneous, elaalic , .. anee, a'ndia covered by an equally atrong, ihinner snbsiance, termed Dura juister.- ,. brain itself is a soft, pliable, sensitive eube. Ita appearance round the edge, in the jsubjecty ís ofa light rdcolor. External. t haa the appearnnce of a compound stube, - possesses a brighter and more beautiful '.. Such is the largor brain. ■ ■ ■ ie Lesser Brain haa more of a yellovr color a external appearanco rr-does not posses a lively hue as the tonner, and is more dull nanimate. It the sam&nppearance , ts downward) '.extensión,. Thia U what is . eá ihe" Mutulla Oblongata." The whole i is made up of smal! sensitivo nerves. One . re inch of brain coniainaupvvards of 66,000 , xondlij, Of tht strdt.tu.rt of the muscular "' sympathetic nervzs - their office, function, Man has five distinct senses- Sight, HcarTasie, Smelt, and Touch. Through these es all exiernal impressions are conveyed to rain, tlvrouyh the-anediurn pf what we aha.ll. term the sympathetic -aeree. These yiuitic nrrves extend through the wholo system,. , . :y músete or particle of fleeh is onnecied . , them. They extend to cvery joint, evcry on, cvery membrane, andihrougUi&very. bone t iie iyBtcm. In their posiing; thwugh every iele of fleah, they gather from it ubstances ch they earry to évery meinbrane, tendón, scle and liarnent, which surrounds, controla embracen every joint. Tliey are thickly f i'ersed through the bones, and are traced to utmost extremiticB,and in fibres so mail, that x exisience haa been queslioned. To show that theso nervcs pass thtough every , e, we will suppose a boa? in any part of the ybroktn. ' After placing the parts together, keeping the limb in a quiet conditionfor a iod of time, they become aolid as before. - w, if I should aak' the Physician, ,why the es do grow togeth again 7 bis aiiswer would uriably be, ' It is natural.' Vgain. Supposo that a wound is madp, in tho i h, and 1 should ask'the physician if it would lngaini Certaiiiy,' would; be jth ana-., ,, r. Suppose I ehuöld ask him why ho ie conccd it will hesl again ? Hia aasvrer would 'ƒ know iy experience.' Mmost in evöVy caso the physician is not I inted witii tho primury cause of iis beconung ;ored, but siinply affirms, ' I know it by exence.' 'iow we will take1 the bone that. ia brolten, anct ce the paf ts together, as before mentioned, and"1 : will inquire the 'cause of its becoming sound, te small l'.'iires or neives in the bone are set at ; jrk. They accomulate nd carry regularly nü substances or particlca and deposit them at e place broken. Ten.thousond of these in onane, pcrfoim the same action, and continue de8iting amall snbfiances utitil they complettly lite tlie broken borle togethe. -These deposs becoine-ossified, wliich -givee tlieistrengüi. - ,. owplain i the canse, therefore, why it is natal for two bones to grow togetlier.or bccomv littd. Whenever a bone in uny part oí the s}siii ia affacted1 the pain in thai bom: is most in- , iffcrable. But would Eucksensation exist, ia e part afieded, nnlsssj were netres ofsennion exieting in tho bone itself? Ceriainly ot." ■ . n ■