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Zusammenfassung
Identifier: b20416039_001
Title: On the anatomy of vertebrates [electronic resource]
Year: 1866 (1860s)
Authors: Owen, Richard, 1804-1892
Subjects: Anatomy, Comparative Vertebrates Fishes Reptiles Mammals Birds
Publisher: London : Longmans, Green
Contributing Library: Wellcome Library
Digitizing Sponsor: Wellcome Library
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Text Appearing Before Image:
ss of clear trembling jelly; but consists of aseries of delicate membranous plates inclosed by, or adherent bytheir margins to, a proper capsule, and separated from each otherby a small quantity of a limpid albuminous fluid. Each flattenedcell thus formed is lined by an epithelium of nucleated cells:the fibrous tissue of the plates and common capsule presents themicroscopic characters of elastic tissue; between it and the epi-thelium is a clear unorganised layer, the seat of the ultimateramifications of the vessels and nerves. The proper capsuleadheres to the aponeurotic partition-walls which support the 1 ci.xxit. p 521, pis. xl. xli. xlii. ELECTRIC ORGANS OF FISHES. 351 columns and the larger branches of the nerves and vessels of theorgan. Some of the vertical columns do not extend through theentire thickness of the organ; but are interrupted where thedeep-seated nerves traverse the substance of the battery, fig. 2.31,a, d. The transverse plates of the vertical columns are shown 231
Text Appearing After Image:
The right electrical organ, divided horizontally, at the place where the nerves enter, Torpedo, lxxxi. at E. Hunter, who counted 470 columnsm each organ, describesthe partitions as being very vascular :—( The arteries, lie says, are branches from the vessels of the gills, which convey theblood that has received the influence of respiration.1 But the 1 I.XXXT. 352 ANATOMY OF VERTEBRATES. most characteristic feature of the organisation of the electricbattery is its enormous supply of nervous matter. Each organderives this supply from one branch of the trigeminal, fig. 231, A,and from four branches of the vagal nerves, ib., b, C, D ; the fouranterior nerves are each as thick as the spinal cord: the lastnerve is a feeble branch of the vagus. The trigeminal andvagal enlargements of the olivary and restiform tracts coalesce oneach side, forming the so-called f electric lobes of the medullaoblongata. The electric branch of the fifth nerve may be definedeven at its origin, from the true gan
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