. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. a, b, and c, lymphatic vessels inverted, giving three different mews of the valves formed by the lining membrane. (After Breschet.) line the vessel, and is reflected towards its inte- rior ; having reached half-way across, it is doubled upon itself, and returns to the side of the vessel, which it continues to line as if it had never been interrupted. The two layers of this fold adhere very firmly together so as to form a very delicate transparent semilunar flap. It pre-ents a convex attached, and a straight or slightly c
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. a, b, and c, lymphatic vessels inverted, giving three different mews of the valves formed by the lining membrane. (After Breschet.) line the vessel, and is reflected towards its inte- rior ; having reached half-way across, it is doubled upon itself, and returns to the side of the vessel, which it continues to line as if it had never been interrupted. The two layers of this fold adhere very firmly together so as to form a very delicate transparent semilunar flap. It pre-ents a convex attached, and a straight or slightly concave unattached edge; the former corresponds to a semilunar line on the interior of the vessel, the horns of which look towards the trunks of the system, where the lining mem- brane was reflected from and returned to the side of the vessel; the latter to the line of doubling Fig. a, a front view of a valvular flap, b, a profile view of a lymphatic vessel and valvular flap j the lower half of the flap, or that nearest the base, is represented thicker than the rest. According to Lauth and Breschet, this thicker portion is formed of all the coats of the vessels ; the thinner portion, of the lining membrane only. (From Breschet.) of the membrane upon itself; thus a little pouch is formed between the flap and the side of the vessel, which can only be filled by the fluid passing in one direction ; and as a valve is constituted of two such pouches, when they are filled the vessel is completely closed. Some anatomists conceive that a lamina of fibrous tissue intervenes between the layers of the fold. Breschet, in his " Systeme Lymphatique," adopts Lauth's view of the structure of the valve. He describes the flap of a valve as composed of two parts, one thicker and situated at the base of the fold, the other forming the rest of the flap more thin and delicate. It is this latter part which he conceives is formed by a doubling of the lining membrane only, while the thick
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