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On the nose develop four muscles, knowledge in top, the pyramidal one; in bottom, the myrtiforme; on the sides, the transverse and the dilator one of the nostrils.
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The renal arteries, two, arise on the side faces from the abdominal aorta, a little below the anterior mesenteric artery, on the level of the second lumbar vertebra. Their volume is important their diameter can reach 8 millimeters. Generally the renal arteries are detached at the same level, sometimes the left renal artery arises on a higher level. It is traditional to say that the arteries move horizontally outwards but the assertion is not absolutely exact: indeed, these arteries move obliquely bottomward, forming with the aorta an acute angle which can go down up to 45 degrees. In addition to this obliqueness in the frontal plan, the renal artery follows a curve of a posterior concavity which adapts to the convexity of the vertebral body this curve is more marked on the right than on the left.
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The superior mesenteric artery arises from the anterior surface of the aorta, on the middle line, at 2 cm below the origin of the coeliac artery, nearly at the level of the disc between the second and third lumbar, vertebras.
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Syn.: Thoracique interne; mammaria interna; -Innere Brustpulsader.
The internal mammary artery, of a lower diameter than the one of the vertebral artery, is remarkable by the extent of its course and by the multiplicity of its branches; it arises from the former face of the subclavian artery, at 3 or 4 mm apart from the vertebral artery. From its origin, it goes bottom, ahead, and a little medialward and reaches the posterior face of the first costal cartilage; there, it becomes vertical, perpendicularly crosses the posterior face of the first six costal cartilages, and, at the level of the sternal end of the sixth intercostal space, is divided into two terminal sections, one intern and the other extern.
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The pancreas is an exocrine and endocrine gland.
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