. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 1376 VEIN. trasting remarkably with that of the heart: this exists in less amount in the immediate vicinity of that organ. There is yet another peculiarity in the structure of the great veins near the heart,— they have a partial investment of the serous layer of the pericardium ; this, however, exists only on the anterior surface ; and in the in- ferior cava the amount of serous covering is very small. 861. \. A Mass of Muscular Fibres from the Middle Coat of the Superior Vena Cava of the Human Subject, eight or ten line
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 1376 VEIN. trasting remarkably with that of the heart: this exists in less amount in the immediate vicinity of that organ. There is yet another peculiarity in the structure of the great veins near the heart,— they have a partial investment of the serous layer of the pericardium ; this, however, exists only on the anterior surface ; and in the in- ferior cava the amount of serous covering is very small. 861. \. A Mass of Muscular Fibres from the Middle Coat of the Superior Vena Cava of the Human Subject, eight or ten lines above its junction with the Auricle. (Magnified 200 diameters.) II. When the caves pass through the peri- cardium and diaphragm they contract an inti- mate connection with those structures whose fibrous tissue is more or less reflected upon them and adds to their coats. Upon the su- perior cava are to be seen (external to the pericardium) white, "listening fibres, having a longitudinal course, and traceable from the pericardium directly upon the vein. The pulmonary veins have a similar covering. In the human subject, the inferior cava passes through the pericardium and diaphragm at once, and there forms so intimate an ad- hesion to the margin of the aperture that I have removed striped muscle (of the dia- phragm) from the fibrous tissue of the vessel, it having taken its origin from the outer tunic of the vein. In many of the lower animals (as in the sheep, cat, and rabbit,} there is a considerable interval between the diaphragm and pericar- dium, in which the vena cava inferior is in- vested with a covering of fibrous tissue con- tributed from both these sources. It is white, glistening, and strictly longitudinal, and is fur- nished in largest amount by the pericardium. III. Cerebral sinuses.—The cerebral sinuses hold the place of large veins to the brain, but are materially different from large veins in structure. They consist of excavations or tubes in the substa
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