Archive image from page 223 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana03todd Year: 1847 210 LYMPHATIC AND LACTEAL SYSTEM. simply presses the flaps back against the sides of the vessel, and thus no obstruction is offered to its onward course. The flap of a valve con- sists of a fold of the inner coat of the vessel, which, where a valve is to be formed, ceases to Fig. 48. 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 i
Archive image from page 223 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana03todd Year: 1847 210 LYMPHATIC AND LACTEAL SYSTEM. simply presses the flaps back against the sides of the vessel, and thus no obstruction is offered to its onward course. The flap of a valve con- sists of a fold of the inner coat of the vessel, which, where a valve is to be formed, ceases to Fig. 48. 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. 49.
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