. Elements of physiological psychology; a treatise of the activities and nature of the mind, from the physical and experimental points of view . rence of thebrain stem from the cord is largely due to the circumstance that the central cavity of the neural tubesometimes opens out into ventri-cles, and at all times lies nearthe dorsal side. Passing upwardfrom the cord, we find the centralcanal, in the lower region of thebulb, first verging toward thedorsal surface, and then openingout into the fourth dorsal wall here becomes awide membrane, overlying theventricle, and itself overlai
. Elements of physiological psychology; a treatise of the activities and nature of the mind, from the physical and experimental points of view . rence of thebrain stem from the cord is largely due to the circumstance that the central cavity of the neural tubesometimes opens out into ventri-cles, and at all times lies nearthe dorsal side. Passing upwardfrom the cord, we find the centralcanal, in the lower region of thebulb, first verging toward thedorsal surface, and then openingout into the fourth dorsal wall here becomes awide membrane, overlying theventricle, and itself overlain bythe cerebellum. The fourth ven-tricle continues upward throughthe pons, narrows in the mid-brain to the aqueduct, whichbroadens again in the inter-brainto the third ventricle. This lastis continuous through a narrowopening with the lateral ventri-cle of each hemisphere. § 15. A series of sections acrossthe brain-stem will give some ideaof its internal structure (compareFig. 33). If we make our first sectionthrough the bulb, shortly abovethe imaginary line ;«rhich sepa-rates it from the spinal cord, wefind an arrangement of parts The. fta. Fig. 34.—Section of the Bulb at the Levelof the Sensory Decussation. (Schwalbe.), dorsal, and /., ventral fissures;cc., central canal, surrounded by n. XIand n. XII, the nuclei of the 11th and12th nerves; H and H^, the dorsal col-umns, with and (also ),theirnuclei; , spinal root of the fifth nerve,the fibres of which terminate successivelyin the adjoining gray matter, g, which maybe regarded as a continuation of the dor-sal horn of the cord; , the reticularformation, containing fibres which issuefrom the nuclei of the dorsal columns andof the fifth nerve, and which cross themiddle line in the sensory decussation,; , ^, , arciformfibres, passingtoward the cerebellum; , o, o, ,different nuclei of gray matter, of which0 is the lower end of the olivary nucleus;py, pyramid. much like
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Keywords: ., boo, bookcentury1900, bookdecade1910, booksubjectpsychophysiology
