Identifier: humanbodyhealthe00davi (find matches)
Title: The human body and health : an elementary text-book of essential anatomy, applied physiology and practical hygiene for schools
Year: 1908 (1900s)
Authors: Davison, Alvin, 1868-1915
Subjects: Physiology Hygiene
Publisher: New York : American Book Company
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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Fig. 83. — Regions Tvhere large arteries lie nearthe skin. 124 THE CIRCULATORY SYSTEM routes are provided for the blood to and from the ex-tremities, as may be seen in the figures. The brain isa most important organ, and there are four different channels providedfor carrying to itthe blood from thelarge vessels in thechest. In the limbs thechief veins, arteries,and nerves lie closetogether and usuallynear the bone. An-other set of veins,known as superficial^lie just beneath theskin. These maybe seen plainly inthe arm. Lymph Vessels,or Lymphatics.—There are numerouschinks and crevicesamong the tissuescalled lymph spaces.Large lymph spaces exist within the serous membranes ofthe thoracic and abdominal cavities. From all of thesespaces the lymph is conveyed by minute vessels calledlymph capillaries. They form a thick network in manyparts of the body. They unite to form larger vessels, andthese combine to form trunks, of which there are several
Text Appearing After Image:
Fig. 86. — a is bluing injected through the skin ona cats ear, to show how from this lymph spacethe many tiny lymph vessels take up the bluematerial and pass it on to larger vessels. LYMPH VESSELS, OR LYMPHATICS 125 extending up each limb and downward from the head.Those from both legs, the left side of the body, neck,head, and left arm join the left thoracic duct. This isabout the size of a lead pencil, and extends from the lum-bar region along the back side of the body cavity to unitewith the large vein inthe neck. The trunksof the right side of thebody, right arm, andright side of head andneck join the very shortduct emptying into avein on this side of theneck. Vessels also leadfrom the internal organsto the thoracic duct.Those extending fromthe small intestine arecalled lacteah^ becausein addition to the lymphthey convey the fattyportions of the food, appearing white like milk. The purpose of the lymphvessels is to return to the veins that part of the bloodwhich escapes from the

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