. A treatise on practical anatomy: for students of anatomy and surgery . cond, a basement-mem-brane consisting of a homegeneous membrane supportedby the skeletal, reticulated, connective-tissue , a fenestrated membrane composed of white andyellow elastic fibres. As arteries become much reduced in size they losesome of their physical characters, and when they are verysmall and but two coats are distinguishable they takethe name of arterioles. While capillaries are the small-est radicles of the arterial system, measuring on anaverage about one three-thousandth of an inch indiamet
. A treatise on practical anatomy: for students of anatomy and surgery . cond, a basement-mem-brane consisting of a homegeneous membrane supportedby the skeletal, reticulated, connective-tissue , a fenestrated membrane composed of white andyellow elastic fibres. As arteries become much reduced in size they losesome of their physical characters, and when they are verysmall and but two coats are distinguishable they takethe name of arterioles. While capillaries are the small-est radicles of the arterial system, measuring on anaverage about one three-thousandth of an inch indiameter, they present, as a rule, but a single coat,the inner, and frequently of this only the epitheliallayer exists. Thus, hi the capillaries of the lungs,brain, and liver the only structure presented by thecapillary is a single layer of epithelial cells jointed attheir edges. 234 PRACTICAL ANATOMY. THE AORTA. The aorta springs from the base of the left ventricle,curves upward toward the right, then forms an arch theconvexity of which is superior; it then passes down the. Fig. 105.—The Aokta. 1, third cervical nerve ; 2, fourth cervical nerve ; 3, pnenmogastric nerve; 4, fifth cer-vical nerve ; .5, hraehial plexus ; 6, phrenic nerve ; 7, lines of reflection of pericardium ;8, cervicalis ascendens artery ; 9, scalenus antious ; 10, inferior thyroid artery ; 11, super-ficialis colli artery; 12, phrenic nerve; , posterior scapular artery; 11, svipra-scapularartery; 15, subchavian artery; 16, superior intercostal artery; 17, internal mammaryartery; 18, pnenmogastric nerve ; 19, phrenic nerve ; 20, appendix of left auricle. left side of the vertebral column through the aortic openingin the diaphragm, and divides at the fourth lumbar ver-tebra into the two common iliacs. The aorta is divided THE AORTA. 235 into an arch, the thoracic portion and the abdominal por-tion. The arch of the aorta is liorseshoe-shaped. It beginsat the left ventricle of the heart (about the level of thefour
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomy, bookyear1891
