Hand-book of physiology (1892) (14742385986)

Identifier: handbookofphysio00bake (find matches)

Title: Hand-book of physiology

Year: 1892 (1890s)

Authors: Baker, W. Morrant, (William Morrant), 1839-1896 Harris, Vincent Dormer Kirkes, William Senhouse, 1823-1864. Hand-book of physiology. 13th ed

Subjects: Physiology Human physiology

Publisher: London : John Murray

Contributing Library: Francis A. Countway Library of Medicine

Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

Text Appearing Before Image:

bres. Ex-ternally the cells send offseveral branched processeswhich pass into the nextlayer and are lost to view,these having become by afurther branching, exceed-ingly fine. 4. Inner molecular layer.—This presents a finelygranulated appearance. Itconsists of a punctiformconnective tissue traversedby numberless very finefibrillar processes of thenerve-cells and the minutebranchings of the processesof the nuclear cells of thenext layer. 5. Inner nuclear layer.—This consists chiefly ofnumerous small round cells,with a very small quantity of protoplasm surrounding a large ovoid nucleus ; they are gene-rally bipolar, giving off one process outwards and another inwards.They greatly resemble the ganglion corpuscles of the cerebellum,and are of three kinds at least: the most internal, is small andround, sending in several processes into the inner molecular,but none in the other direction; the central, sends a long andvaricose filament to break up into minute branchings in the inner 3 a 2

Text Appearing After Image:

Fig. 417 a.—Diagram showing the nervous ele-ments of retina. 1, nerve fibre to ganglioncell; 2, processes of ganglion cell going out-wards ; 3, nerve fibre passing direct to granulein inner nuclear layer ; 4, process of ganglioncell to granule; 5, fibre from cone-granulebreaking up into fibrils which are connectedwith rod and cone fibrils. (From MacKendrick,after Wtuhr.) 724 THE SENSES. (CH. XVII. molecular layer and two in the other direction, and produce inthe internuclear layer a very line plexus of fibrils, while theexternal, a rather larger cell which is placed with its long axistransverse, sends downwards a long and oblique process whichterminates in minute branchings at the internal part of the innermolecular layer, and two thick processes which end in a similararborescence in the internuclear layer. Besides these there arelarge oval nuclei (fig. 417) belonging to the sustentacular con-nective tissue fibres. 6. Inter granular, internuclear, or outer molecular layer.—This la

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1892

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