Outlines of Lectures on Physiology; With an Introductory Chapter on General Biology, and an Appendix Containing Laboratory Exercises in Practical Physiology - Softcover

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1886. Excerpt: ... (b) Copious flow of saliva. (c) This secretion will take place in a decapitated animal. (d) Secretion follows stimulation of the lingual nerve or of the tongue (reflex act). (e) After administration of atropin secretion does not take place, but the vessels dilate as before. (/) Secretion will take place when the pressure in the duct is greater than that of the blood in the artery of the gland or even the carotid. Conclusions: 1. The Chorda Tympani is the secretory nerve of the gland; secretion is accompanied by vascular dilation (a and b). 2. Secretion is not purely a process of filtration (c, e and/). 3. Secretion may be excited reflexly (d). Stimulation of the cervical sympathetic in the dog gives rise to vascular constriction and scanty flow of viscid saliva; the exact opposite of the results on stimulating the chorda. Diagram of the nervous mechanism of salivary secretion. The " paralytic" secretion of saliva. The secreting centre. Influence of higher centres over it. The Gland compared histologically before and after sti mulation: Behaviour towards reagents; alteration in lumen; alteration in size of cells; position of nucleus; degree of granulation, etc. The nervous mechanism of salivary secretion was worked out by Claude Bernard. Constructive (anabolic) and destructive (Jcatabolic) action in the gland protoplasm; mother-ferment, pro-ferment, zymogen. DEGLUTITION. The bolus of food; part taken by tongue, cheeks, &c. Swallowing may be partly voluntary and partly involuntary; is essentially involuntary. Stages; muscular mechanism. Protection of the respiratory openings. Is a reflex act; centre in the medulla. The oesophagus: circular and longitudinal muscular fibres; voluntary and involuntary muscle cells; mucous glands. Peristaltic action. Relaxation...

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