. Cunningham's Text-book of anatomy. Anatomy. DIPLOIC AND MENINGEAL VEINS. 969 branch, which emerges from the lower and posterior part of the gland and forms the main commencing tributary of the external jugular vein. VENOUS SINUSES AND VEINS OF THE CRANIUM AND OF ITS CONTENTS. The venous channels met with in the cranial walls and cranial cavity are:— (1) The diploic veins, which lie in the spongy tissue between the outer and inner tables of the cranial bones. (2) The meningeal veins, which accompany the meningeal arteries in the outer layer of the dura mater. (3) The veins of the brain, which
. Cunningham's Text-book of anatomy. Anatomy. DIPLOIC AND MENINGEAL VEINS. 969 branch, which emerges from the lower and posterior part of the gland and forms the main commencing tributary of the external jugular vein. VENOUS SINUSES AND VEINS OF THE CRANIUM AND OF ITS CONTENTS. The venous channels met with in the cranial walls and cranial cavity are:— (1) The diploic veins, which lie in the spongy tissue between the outer and inner tables of the cranial bones. (2) The meningeal veins, which accompany the meningeal arteries in the outer layer of the dura mater. (3) The veins of the brain, which lie between the folds of pia mater and in the subarachnoid space. (4) The cranial venous sinuses, channels which are situated between the outer and inner layers of the dura mater; they receive the blood from the terminal cerebral veins. Diploic and Meningeal Veins. Vense Diploicse. — The diploic veins are anastomosing spaces in the spongy tissue of the flat bones of the skull; they are lined with endothelium. The number of efferent vessels which emerge from these spaces is not constant, but usually there are at least four on each side—viz., a frontal, two temporal, anterior and posterior, and an occipital. The frontal diploic vein is one of the most constant; it drains the anterior part Posterior tempore diploic veil Occipital diploic vein. Anterior temporal diploic vein — Frontal diploic vein Fig. 786.—The Veiss of the Diploe. of the frontal bone, and, passing through a small aperture in the upper margin of the supra-orbital notch, terminates in the supra-orbital vein. The anterior temporal diploic vein drains the posterior part of the frontal bone and the anterior part of the parietal bone; it pierces the great wing of the sphenoid, and terminates either in the spheno-parietal sinus or in the anterior deep temporal vein. The posterior temporal diploic vein drains the posterior part of the parietal bone; it runs downwards to the posterior inferior angle of the parie
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