. Human physiology. mm Fig. 107. — A LymphaticGland with its Vessels. Fig. 108.—The Superficial Lym-phatics of the Arm and Hand ii4 ELEMENTARY PHYSIOLOGY capillus, a hair) which originate in the organs and tissues of nearlyevery part of the body. Those which have their origin in thewalls of the intestines differ from the others in that they contain,during digestion, a fluid resembling milk in appearance. Theyare consequently distinguished from the other lymphatic capil-laries by the name lacteals. (Lat. lac, milk.) We now proceedto study the nature and uses of these Fig. 109.—Lympha
. Human physiology. mm Fig. 107. — A LymphaticGland with its Vessels. Fig. 108.—The Superficial Lym-phatics of the Arm and Hand ii4 ELEMENTARY PHYSIOLOGY capillus, a hair) which originate in the organs and tissues of nearlyevery part of the body. Those which have their origin in thewalls of the intestines differ from the others in that they contain,during digestion, a fluid resembling milk in appearance. Theyare consequently distinguished from the other lymphatic capil-laries by the name lacteals. (Lat. lac, milk.) We now proceedto study the nature and uses of these Fig. 109.—Lymphatics of the Head, Neck, Thorax, &e. i and 2, the upper portion of the thoracic duct, showing its junction with the venous system. It will be remembered that the small intestine is lined inter-nally by a mucous membrane which is characterised by a numberof minute hair-like projections called villi, giving the mem-brane the appearance of a yellowish or pinkish velvet. Each•villus is supplied with a network of blood capillaries, and alsoone or more lacteals. These vessels are very advantageouslysituated for absorption, as they are surrounded on all sides by L<J \A \:h k ABSORPTION 5 Fig. no.—The Tho-racic Duct. i, the thoracic duct, infront of the vertebralcolumn ; its upper ex-tremity communicatingwith the venous systemat the junction of theleft jugular and left sub-clavian veins (comparewith fig. 6); 2, recep-taculum ehyli; 3, in-ferior vena cava, lowerportion ; 4, superiorvena cava. digested food-substances, only an extremelythin layer of tissue separating
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