. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 39 lob. Fig. 1. Sagittal section of brain of Cynoscion regale (squeteague); outlines with the aid of camera lucida. X ^^• cbl. cerebellum, coll. colliculus. fbr. R. Reissner's fibre, lob. /. frontal lobe. lob. Dag. vagus lobe. tct. opt. tectum opticum. tor. Ig. torus longitudinalis. vlv. cbl. val- vula cerebelli. vnt. opt. ventricle of optic lobes. sections of Reissner's fibre in Cynoscion, when double stained with Ehrlich's hematoxylin and Congo red, show a very definite internal structure. The medullary portion takes th
. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 39 lob. Fig. 1. Sagittal section of brain of Cynoscion regale (squeteague); outlines with the aid of camera lucida. X ^^• cbl. cerebellum, coll. colliculus. fbr. R. Reissner's fibre, lob. /. frontal lobe. lob. Dag. vagus lobe. tct. opt. tectum opticum. tor. Ig. torus longitudinalis. vlv. cbl. val- vula cerebelli. vnt. opt. ventricle of optic lobes. sections of Reissner's fibre in Cynoscion, when double stained with Ehrlich's hematoxylin and Congo red, show a very definite internal structure. The medullary portion takes the Congo red evenly, and by careful focussing under a ^/jg oil immersion presents a very finely granular appearance. Surrounding this is a hyaline layer, which takes the stain very lightly, if at all. Outside this, on the periphery, is a sheath taking a deep hematoxylin stain (Fig. 11). The existence of this darkstaining sheath is often apparent in cross sections stained by other methods, and also in longitudinal sections. Occasionally in cross section there may be seen coming from the fibre very fine filamentous pro- cesses, which run toward the periphery of the canal. These have a diameter of probably less than 0,1 /<. I shall have occasion to de- scribe these further on. As already stated, Reissner's fibre extends through the whole length of the canalis centralis of the cord and continues cephalad through the 4th and 3d ventricles to the anterior end of the optic lobes. Posteriorly the fibre can be traced with little diminution in size, until near the extreme posterior end, as far, indeed, as the lumen of the canal can be distinguished. I have studied this portion of the fibre particularly in larval Amia and Lepidosteus from 1 to 2 cm in length. In an Amia 17 mm long the lumen of the canalis centralis in the middle region of the body has a diameter of 16 /<, the fibre that of. Please note that these images are extracted from scanned page images that may have been digi
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