The development of the human body; a manual of human embryology . ong tothe sympathetic system, there occur throughout the body,in various regions, certain peculiar organs which areclosely associated with the same system both in theirorigin and in their adult relations, but whose exact phys-iological significance is as yet problematical. The Ganglia Intercarotica.—These structures, which arefrequently though incorrectly termed carotid glands, aresmall bodies about 5 mm. in length, which lie usually tothe mesial side of the upper ends of the common carotidarteries. They possess a very rich arte
The development of the human body; a manual of human embryology . ong tothe sympathetic system, there occur throughout the body,in various regions, certain peculiar organs which areclosely associated with the same system both in theirorigin and in their adult relations, but whose exact phys-iological significance is as yet problematical. The Ganglia Intercarotica.—These structures, which arefrequently though incorrectly termed carotid glands, aresmall bodies about 5 mm. in length, which lie usually tothe mesial side of the upper ends of the common carotidarteries. They possess a very rich arterial supply andstand in intimate relation with the branches of an inter- ACCESSORY SYMPATHETIC ORGANS. 449 carotid sympathetic plexus, and, furthermore, they arecharacterized by possessing as their specific constituentsmarkedly chromaffine cells (see p. 392), among which arescattered stellate cells resembling the cells of the sympa-thetic ganglia. They have been found to arise in pig embryos of 44 the separation of cells from the ganglionic masses scat-. Fig. 236.—Section of a Cell Ball from the Intercarotid Ganglion of Man. be, Blood capillaries; ev, efferent vein; S, connective-tissue septum; /, trabecular.—{From Bbhm and Davidoff, after Schaper.) tered throughout the intercarotid sympathetic cells, which become the chromaffine cells, arrangethemselves in round masses termed cell balls, many ofwhich unite to form each ganglion, and in man each cellball becomes broken up into trabecular by the blood-vessels (Fig. 236) which penetrate its substance, and the38 450 THE DEVELOPMENT OF THE HUMAN BODY. individual balls are separated from one another by con-siderable quantities of connective tissue. Some confusion has existed in the past as to the origin of thisstructure. The mesial wall of the proximal part of the internalcarotid artery becomes considerably thickened during the earlystages of development and the thickening is traversed by numer-ous blood l
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902
