13.1 POJA-L4661+4662
Valves in vein (human)
13.1 POJA-L4661+4662
Title: Valves in vein (human)
Description:
(A-B): Peripheral vein with valves (limb), resorcin-fuchsin and light green (A). Trichrome (B).
(A): These venous valves (valvulae venosae) are connective tissue foldings lined by endothelium. In cross-section: valves (1), connective tissue juncture of the valve (2) to the muscle. In this area the intima-media contains circular and longitudinal smooth muscle cells (SMC) (3). The adventitia (4) shows connective tissue with numerous red-stained elastic fibres. Remnants of aggregated plasma and lysed erythrocytes (6) in lumen of vein. A collar (7) of collagen fibers and purple-red elastic fibres enfolds and fixes the adventitia to the environment (8, adipose tissue). At (9) small blood vessels and nerve fibres.
(B): Longitudinal sectioned valve (1): connective tissue juncture (2), the adventitia with longitudinal arranged SMC (4) is fixed to the perivascular tissue (8). (5) Free edge of valve. (10) Intima.
Background: Valves support the blood circulation in one direction only, related to the low blood pressure as well as the hydrostatic pressure in distant peripheral veins. There are numerous venous valves in the lower half of the body, few are found in the area of head/ neck. Valves are absent in brain, liver and kidney veins.
Keywords/Mesh: cardiovascular system, vascularisation, vein, valve, hydrostatic pressure, histology, POJA collection
Title: Valves in vein (human)
Description:
(A-B): Peripheral vein with valves (limb), resorcin-fuchsin and light green (A). Trichrome (B).
(A): These venous valves (valvulae venosae) are connective tissue foldings lined by endothelium. In cross-section: valves (1), connective tissue juncture of the valve (2) to the muscle. In this area the intima-media contains circular and longitudinal smooth muscle cells (SMC) (3). The adventitia (4) shows connective tissue with numerous red-stained elastic fibres. Remnants of aggregated plasma and lysed erythrocytes (6) in lumen of vein. A collar (7) of collagen fibers and purple-red elastic fibres enfolds and fixes the adventitia to the environment (8, adipose tissue). At (9) small blood vessels and nerve fibres.
(B): Longitudinal sectioned valve (1): connective tissue juncture (2), the adventitia with longitudinal arranged SMC (4) is fixed to the perivascular tissue (8). (5) Free edge of valve. (10) Intima.
Background: Valves support the blood circulation in one direction only, related to the low blood pressure as well as the hydrostatic pressure in distant peripheral veins. There are numerous venous valves in the lower half of the body, few are found in the area of head/ neck. Valves are absent in brain, liver and kidney veins.
Keywords/Mesh: cardiovascular system, vascularisation, vein, valve, hydrostatic pressure, histology, POJA collection