Anatomy
The infra-hyoid muscles form a group of four long flat muscles, arranged in two layers, and enveloped by the deep layer of the cervical fascia.
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The aorta or great artery is the large main trunk of a series of vessels which convey red or oxygenated blood from the heart over the entire body.
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This group comprises only the buccinator muscle.
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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 angular series are four in number: viz. the zygomaticus major, levator anguli oris, risorius and depressor anguli oris. Two descend to the corner of the mouth obliquely from above, one runs almost horizontally forwards, and one ascends from below. They blend at the corner of the mouth, and form there a thick, muscular mass, behind which is a depression filled up with the fat covering the buccinator. In a lean face this depression is often very conspicuous, and in some faces its position is indicated by a dimple when the zygomaticus major contracts.
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After having crossed the diaphragmatic channel, the aorta belongs to the abdominal area. Applied on the vertebral level, it is located behind the intestinal mass. The abdominal aorta moves vertically in bottom however, the diaphragmatic opening being a little on the left of the line of centers, one can say that the abdominal aorta direction continues the thoracic aorta , and only on the level of the fourth lumbar vertebra it becomes exactly median thus moves slightly on the right.
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The orbicularis oris - an unpaired muscle, named from its shape and situation - is an oval sheet with the long axis placed transversely, and its fibres arranged round a transverse central aperture. Like the orbicularis oculi, the muscle may be divided into an internal or labial portion, and an external or facial. The first part, which is superficial, has no bony connection, except through the medium of the adjacent muscles with which it is closely blended. The second, which is deep and |which forms part of the third layer of the facial muscles, has the following small Ibony attachments.
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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 pulmonary artery [a. pulmonalis] passes from the right ventricle to the lungs. It differs from all other arteries in the body in that it contains venous blood. It arises as a short, thick trunk from the conus arteriosus of the right ventricle, and, after a course of about 5 cm. (2 in.) within the pericardium, divides into a right and a left branch. These branches pass to the, right and the left lung respectively.
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The arteries of the hand frequently vary from their usual mode of distribution.
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The arch of the aorta (arcus aortas), commences at the upper part or base of the left ventricle of the heart, in front of the left auriculo-ventricular orifice ; it then passes upwards and to the right side, somewhat in the direction of the heart itself, crossing obliquely behind the sternum, and at the same time approaching more nearly to that bone; having gained the level of the upper border of the second costal cartilage of the right side, the vessel alters its course, and arches over from right to left, at the same time inclining backwards to reach the left side of the second dorsal vertebra ; here it makes another turn, and changes its direction so as to incline downwards upon the left side of the third dorsal vertebra, at the lower border of which the arch of the aorta becomes continuous (without any mark of separation) with the straight descending portion of the vessel known as the thoracic aorta.
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Of these branches the radial recurrent is sometimes very large, or it may be represented by several separate branches. When the radial itself arises high up, the recurrent artery usually comes from the residual brachial trunk or from the ulnar artery, or more rarely from the interosseous. When given from the brachial trunk, the radial recurrent has been found crossing beneath the tendon of the biceps.
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The spleen is a large blood-vascular