A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . taken by the externaljugular (W. Krause). This is a persistence of an earlyfetal condition, for in earlj- fcetal life the primitive orexternal jugular returns all the blood from the is the normal adult condition in many mammals,as rabbits, squirrels, etc. The internal jugular is alto-gether absent in fishes, many anipliibia, birds, and somemannnals, as the horse and ruminants. A case is reported by J. W. Williams** in which theright omohyoid muscle, inste
A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . taken by the externaljugular (W. Krause). This is a persistence of an earlyfetal condition, for in earlj- fcetal life the primitive orexternal jugular returns all the blood from the is the normal adult condition in many mammals,as rabbits, squirrels, etc. The internal jugular is alto-gether absent in fishes, many anipliibia, birds, and somemannnals, as the horse and ruminants. A case is reported by J. W. Williams** in which theright omohyoid muscle, instead of passing over the vein, played by means of its intermediary tendon through aslit iu the vessel. In some cases the temporo-facial trunk fails to emptyinto the internal jugular, the external receiving all itsblood. R. Quain reports a case in wliich a very large anteriorjugular vein communicated with the internal jugularover the carotid artery (see Fig. 4998). The internal jugular may receive the vertebral, thetransverse cervical, and the supiascapular veins. A su-perior intercostal has been seen to empty into it (Lauth);. Fig. 4998.—Facial Vein, continuous with the Anterior Jugiilar, whichis Joined to the Imernal Jugular by a large Communicating Branchover the CaroUd. The internal jugular is seen covering the upperpart of the carotid artery. (R. Quain.) or a large bronchial vein (Weber). The external jugularhas been seen to empty into the internal about the mid-dle of the neck (Fiihrer). OF Cerebral Sinuses.*—The sinusesabout the toreular Herophili are subject to considerablevariation. A true confluence of the sinuses is not alwaysfound at this point. The toreular may be placed to oneside or other of the median line. The connecting branch * J. F. Knott has given an excellent account of the variations of thesinuses in the Journal of Anatomy and Physiology, vol. xvi. 203 REFERENCE HANDBOOK OP THE MEDICAL SCIENCES. between the torc\ilar and straight
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