File:Hand-book of physiology (1892) (14578721898).jpg

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

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ouble sight, diplopia, is often experienced when a single THE CRANIAL NERVES. 617 object is within view of both the eyes : (3) the eye cannot bemoved either upwards, downwards, or inivards : (4) the pupil becomesdilated (mydriasis) : (5) the eye cannot accommodate for shortdistances. The IVth Nerve (Trochlearis). -The IVth nerveof large multipolar gan-glion cells situated below,i.e., ventral to theaqueductus of Sylvius,which extends from theback part of the nucleusof the third nerve to thehind level of the poste-rior corpus quadrigemi-num. The fibres fromeither side sweep roimdthe central grey matter,and reach the valve ofVieussens, where they de-cussate in the middle lineand appear at the frontof the pons at the lateraledge of the cms. Thenucleus of the fourthnerve on either side isconnected with those ofthe third and sixth nerves.Functions.—The IVthnerve is exclusively motor,and supplies only thetrochlearis or obliquussuperior muscle of theeyeball. arises from a nucleus consisting
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365.—Fourth ventricle, with the medulla ob-longata and the corpora quadrigemina. Theroman numbers indicate superficial origins ofthe cranial nerves, -while the other numbersindicate their deep origins, or the position oftheir central nuclei. 8, 8, 8, 8, auditory nucleinerves ; t, funiculus teres ; A, B, corpora quad-rigemina ; c. g, corpus geniculatum; p, c, pe-dunculus cerebri; m, c, p, middle cerebellarpeduncle ; s, c, p, superior cerebellar peduncle ;i, c, p, inferior cerebellar peduncle; I, c, locuscteruleus ; e, t, eminentia teres ; a, c, ala cinerea ;a, n, accessory nucleus ; o, obex ; c, clava ; /, c,funiculus cuneatus ; /, g, funiculus gracilis. The Vth Nerve (Trigeminus). Origin.—The Vth or Trigeminal nerve resembles, as alreadystated, the spinal nerves, in that its branches are derived throughtwo roots ; namely, the larger or sensory, in connection with whichis the Gasseriaii ganglion, and the smaller or motor root which hasno ganglion, and which passes under the ganglio

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