. An analytical compendium of the various branches of medical science, for the use and examination of students. Anatomy; Physiology; Surgery; Obstetrics; Medicine; Materia Medica. VEINS OF THE UPPER EXTREMITY. 151 Inferior petrosal sinus*—Extends from the cavernous sinus on either side, along the inferior margin of the petrous portion of the temporal bone, arid opens into the lateral sinus near its exit from the cranium. Anterior occipital sinus.^—It passes transversely across the basilar process of the occipital bone, between the two inferior petro- sal sinuses. Posterior occipital sinus.^—Th
. An analytical compendium of the various branches of medical science, for the use and examination of students. Anatomy; Physiology; Surgery; Obstetrics; Medicine; Materia Medica. VEINS OF THE UPPER EXTREMITY. 151 Inferior petrosal sinus*—Extends from the cavernous sinus on either side, along the inferior margin of the petrous portion of the temporal bone, arid opens into the lateral sinus near its exit from the cranium. Anterior occipital sinus.^—It passes transversely across the basilar process of the occipital bone, between the two inferior petro- sal sinuses. Posterior occipital sinus.^—This is in the inferior edge of the falx cerebelli, descending from the torcular Herophili; when it reaches the foramen magnum, it bifurcates and empties into the lateral sinus upon either side. This communication is not repre- sented in the diagram. The venous blood from the channels in the diploic structure empties into the sinuses at the base of the cranium. Emissaries of Santorini, are small veins passing through minute foramina of the bones of the cranium and forming a communication between the vessels of the scalp and the sinuses of the brain. VEINS OF THE UPPER EXTREMITY. The veins of the upper extremity are superficial and deep, superficial are readily seen beneath the skin; the deep veins the usual arrangement of the ve?icB comites. The superficial are the following: Cephalic.^—This originates upon the thumb by a branch called cephalicapollicis^ and also upon the back of the hand, and ascending upon the radial side* of the fore-arm, is joined at the elbow by the median cephalic. It pursues its course along the outer side of the arm, and entering a fissure between the pectoralis major and deltoid uwisoXe, it enters into the subclavian vein under the clavicle. It sometimes communicates with the external (Fig. 133.) Basilic,'^ commences with the ve?ia salva- tella of the little finger, and receiving large branches upon the ulnar side of the fore-arm, it is
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