Chambers's encyclopaedia; a dictionary of universal knowledge for the people . part to a level with the sec-ond piece of the breast-bone, and then de-scending to the left side of the third dor-sal vertebra. Five arteries arise from thearch—viz., two coronaries, for the supplyof the muscular tissue of the heart itself ;the innominata ; and the left carotid andleft subclavian arteries. At the connnence-ment of the arch are three small swellingsor pouches, the aortic sinuses, belowwhicii are the three semilunar valves orfolds of the lining membrane, which pre-vent regurgitation of the blood back
Chambers's encyclopaedia; a dictionary of universal knowledge for the people . part to a level with the sec-ond piece of the breast-bone, and then de-scending to the left side of the third dor-sal vertebra. Five arteries arise from thearch—viz., two coronaries, for the supplyof the muscular tissue of the heart itself ;the innominata ; and the left carotid andleft subclavian arteries. At the connnence-ment of the arch are three small swellingsor pouches, the aortic sinuses, belowwhicii are the three semilunar valves orfolds of the lining membrane, which pre-vent regurgitation of the blood back intothe heart. The thoracic A. extends fromthe third dorsal vertebrate the diaphragm,gradually getting into the middle line ofthe spine. The thoracic A. gives off thebronchial arteries (two or three) to sui)plythe tissue of the lungs; and some smallbranches (three or four) to the oesophagus,and intercostal arteries, to sujjply thewalls of the chest (ten on left, and nine onright side). The abdomi?ial A. passestrom the diaphi-agm to the fourth lumbar vertebra, opposite the. Aorta: a, ascending arch of aorta:fS, coronary arteries ; t/,innominata artery ; b,right subclavian ; c. riglitcarotid; rf, left carotid ; ^,left subclavian; /.thoracicaorta ; f/f/. diaphragm ; hhrpl>renic arteries ; z. c«ljacaxis ; /?, coronary or gas-tric ; /, splenic ; rn, he-patic ; 7), superior mesen-leric ; oo, renal arteries ;p, inferior mesenteric ; p,spermatic; n. conimoiiiliac ; r, middle sacral. AOSTA—APATITE. 231 lower margin of which it diviiles into the two common iliac abdominal A. gives off tlie two phrenic arteries to tlie dia-phragm ; the cneliac axis, whicli divides into tlnx-e large branches forthe stomach, liver, and spleen ; tlie snperior mesenteric for thesmall, and part of the large intestine ; the renah (two); tlie siipra-Ienals (two), one for each kidney ; the spermatic ; the inferiormesenteric, for the part of the large intestine not supplied by thesuperior mesen
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Keywords: ., bookcentury1800, bookdecade1880, bookidchamberssenc, bookyear1888
