File:The frog - an introduction to anatomy and histology (1885) (14762339371).jpg

Identifier: frogintroduction00mars (find matches)
Title: The frog : an introduction to anatomy and histology
Year: 1885 (1880s)
Authors: Marshall, A. Milnes, (Arthur Milnes. 1852-1893
Subjects: Frogs Amphibians Histology
Publisher: London : Smith, Elder
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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tric nerve: He, cerebralhemisphere: Lc, optic tract: Lop, optic lobe: M, boundary betweenmedulla oblongata and spinal cord: M 1-10, the spinal nerves: MS, con-nection between fourth spinal nerve and sympathetic chain: N, nasal sac :Ni, sciatic nerve : No, crural nerve : o, eyeball: S, trunk of sympathetic ;S1-10, the sympathetic ganglia : Sp, continuation of sympathetic into head. I, olfactory nerve: II, optic nerve: III, motor oculi: lY, trochlearnerve: V, trigeminal and facial nerves : Ya, ophthalmic branch of trigemi-nal:_ Yc, maxillary branch of trigeminal: Yd, mandibular branch of tri-geminal: Ye, hyomandibular branch of facial: Yg, Gasserian ganglion : Ys,upper end of sympathetic trunk, in connection with Gasserian ganglion : YI,abducens nerve: YII, facial nerve : YIII, auditory nerve : X, glossopharyn-geal and pneumogastric nerves : XI, ramus anterior of glossopharyngeal:X2, ramus posterior of glossopharyngeal: X3-4, branches of pneumogastric. THE NERVOUS SYSTEM OF THE FROG. 73
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74 THE NERVOUS SYSTEM OP THE FROa. These two functions are fulfilled by different nerves, whichmay accordingly be distinguished as (a) afferent or sensorynerves, conveying impulses to the central parts, and (6) efferentor motor nerves, conveying impulses/rom the brain or cord. A special set of nerves in connection with the bloodvesselsand viscera form the sympathetic nervous system. For the dissection of the nervous system specimens should hetaken which have been in strong spirit for two or three days, andin which the brain has been exposed to the action of the spirit byremoval of the roof of the skull. A. The Central Nervous System. Divisible into an anterior portion—the brain—lying in thecavity of the cranium; and a posterior portion—the spinal COrd—which lies in the neural canal of the vertebral column. Thereis no sharp line of demarcation between the two portions, whichare directly continuous with each other. The central nervous system appears at a very early period inthe

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