. Electro-physiology. Electrophysiology. XI ELECTRICAL FISHES 373 Fig. 241, a). According to Sachs, the transverse section of the electrical plate exhibits the following layers from the front, posteriorly (Fig. 242). Next to the anterior papillar layer (stratum papillare anterius) comes a clear and perfectly structure- less stratum, termed by Sachs the intermediate layer (stratum intermedium), corresponding essentially with Pacini's parte fonda- mentale. This is succeeded by the nervous layer (stratum ncrveuni), which, apart from the processes of the posterior star- cells which traverse it, is
. Electro-physiology. Electrophysiology. XI ELECTRICAL FISHES 373 Fig. 241, a). According to Sachs, the transverse section of the electrical plate exhibits the following layers from the front, posteriorly (Fig. 242). Next to the anterior papillar layer (stratum papillare anterius) comes a clear and perfectly structure- less stratum, termed by Sachs the intermediate layer (stratum intermedium), corresponding essentially with Pacini's parte fonda- mentale. This is succeeded by the nervous layer (stratum ncrveuni), which, apart from the processes of the posterior star- cells which traverse it, is of a homogeneous gray colour. It gives off the posterior papillae, and the thorn-like papillae, forming collect- ively the stratum papillare posterius. The electrical nerves end at the nervous layer, as will be described below. Transparently homogeneous in the fresh state, the papilla? become granulated within even 1—2 minutes after removal from the living animal, while a sharp boundary line (PL) appears inside the inter- mediate layer, dividing it into two tolerably equal halves. Cleavage of the plate USUally OCCUrS at FIG. 242.— of electrical plate of Gymnotus; of .. -T-, . •,. „ organ. (Sachs.) these raciman lines, which appear in osmic preparations as a sharp dark streak in a broad, light zone. Sachs found " a substance resembling spider- web " between the anterior papilla?, " consisting of meshes of fine threads with small nuclear-like ; Pacini detected nerves upon the transverse septa only, where Sachs also noted them plentifully, but in addition discovered their terminal branches between the thorn papilla?, and traversing the posterior cavity of the compartment, to end finally, after loss of the medullated sheath, in the plate itself. The posterior surface of the plate exhibits in transverse section (with osniic preparations) the striation (or punctuation as. Please note that these images are extracted from scanned page im
Size: 1399px × 1786px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1800, bookdecade1890, bookpublisherlondonmacmillan
