Human physiology (1913) (14799736313)

Identifier: humanphysiology02luci (find matches)

Title: Human physiology

Year: 1913 (1910s)

Authors: Luciani, Luigi, 1842- Welby, Frances A. (Frances Alice) Camis, Marie Holmes, Gordon, Sir, 1876-1965 Pembrey, M. S. (Marcus Seymour), 1868-1934

Subjects: Physiology

Publisher: London : Macmillan and Co.

Contributing Library: MBLWHOI Library

Digitizing Sponsor: MBLWHOI Library

Text Appearing Before Image:

ropagated from tract to tract by the muscular coat, as inthe intestine ; but that it results from the nerve impulses thatdescend successively by the three branches of the oesophagus fromthe nerve centres. Liischer further noted that stimulation of the central trunk in DIGESTION IN THE MOUTH AND STOMACH 169 of the recurrens in the rabbit produced the same effect as thatof the superior laryngeal, i.e. a swallowing movement confinedto the upper tract which is innervated by the trigeminal, theoesophagus being paralysed owing to the occlusion of the centri-fugal paths contained in the two nerves resected. In morphinisedrabbits, reflex deglutition from the two laryngeals occurs lessreadily than in the normal; sometimes, however, when thesuperior laryngeal is out of court, deglutition can be excited bythe interior laryngeal. After bilateral section of the two inferiorlaryngeals, rabbits die in a few days from pneumonia owing tothe blocking of the oesophagus from the paralysis of its muscles.

Text Appearing After Image:

Fie. 57.—Diagram of the four branches of the recurrens which supply different parts of theoesophagus in rabbit. (Liischer.) c, va^us ; /•, recurrens; 1, -i, 3, 4, its brandies;oesophagus; tr, trachea; It, border-line of thorax. The nerve centres which preside over and co-ordinate themovements of swallowing lie in the upper part of the medullaoblongata, for destruction of the brain above the respiratorycentres (more exactly above, and external to, the ali cineraee ofthe rhomboidal sinus) does not abolish the movements of deglu-tition (Wassilieff, Marckwald). We know, on the other hand,from pathology that the so-called Imlbar paralysis producesdisturbance or inhibition of the act of deglutition. Nothing,however, is known as to the localisation of these centres, on whichdepends the co-ordination of the successive movements in thevarious tracts (buccal, pharyngeal, oesophageal) of the alimentarycanal. The centrifugal paths (as may easily be inferred from theabove experiments) lie in t

физиология человека 1913 г. книжные иллюстрации физиология медицинская наука лекарство изображения из интернет-архива

1913

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