Physiology : A manual for students and practioners / by Theodore C. Guenther and Augustus E. Guenther.

  • Guenther, Theodore C. (Theodore Charles)
Date:
1903
Catalogue details

Licence: Public Domain Mark

Credit: Physiology : A manual for students and practioners / by Theodore C. Guenther and Augustus E. Guenther. Source: Wellcome Collection.

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

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    WKiaiiT AM> ciiowrn III- nil', iuims. \\y.\ comu'clioiis of tlu- iiorvi' comiylifalr ils ()ii;.'-iii and iiitcrirrc with a clear coiiiiJrc^luMision of llu' unaided I'unclioii n|' liu- nerve. The cells of the tihress lie in the huilt on the medial siile oi the tractiid solitarius. Their axoiie.s are sent ci'|ihalad lhriiu,i,di the medial lemniscus. Lalcd bivcdUjdlion--* have kIioivh that the chief path af the t<idr-.-<rii.-<e Ix over the chorda tympaiil nerve, which leaven the ijhtxKophanjiKjeal mainhj a nerve of motor function. X. The afferent Jihres of the vagii.'< convey impulses from the |)lKii-ynx, (i}st)|)liaunts, stomach, liver, pancrea.s. sjjleen, larynx, bronchi, and- lunirs. Their termination is near the naiul vital. The functions of the pneumoL'^astrics are very numerous indeed. It is involved in respiration, deirlutition, in the movements of the stomach, in the action of the heart, linigs, ami viscera. XI. The s}ii)ial accr.'Oionj is a motor nerve essentially, hut it contains some sen.sory fibres. iSectiou produces paralysis of the voice, but does not affect the glottis. Forced respiration is impaired. XII. The hypogloxml is a motor nerve, but possesses some sensory iibres which it derives from the cervical spinal nerves and from the fifth. This nerve is important in mastication. In animals its section is followed by inability to drink on accoinit of ilifficulty in lapping. In man section of the nerve prevents articulation. WEIGHT AND GROWTH OF THE BRAIN. Weight.—Roughly it is three pounds or about one-fortieth of the total body-weight, and this ratio is greater than in the lower ani- mals, with a few exceptions among the smaller birds and monkeys. Weight of Brain in Gramme>< (To|)inard\ Classes. >rales. Females. Macroc'cplialic 192.) to ITOf 174.S to 1.^01 Larcro 1700 14-j1 1.-)()0 1.,)] Medium 14-30 ]'2.')1 1.S.50 ll.)l Smalt 12.'>0 1001 ILiO Wl Microceplialic 1000 oOO 900 28.3 In comparinLT brain-weights, the method of rt'inoval of tlie ence|)halon should always be considered, since retention of |>ia antl the fluids of the ventricles affects the result, l.-?—Phys.