ClipArt ETC
Diagram showing valves of veins. A, part of a vein laid open and spread out with two pairs of valves. B, longitudinal section of a vein, showing the apposition of the edges of the valves in their closed state. C, portion of a distended vein, exhibiting a swelling in the situation of a pair of valves.

Valves of Veins

Diagram showing valves of veins. A, part of a vein laid open and spread out with two pairs of valves.…

Valves of veins. A shows a vein cut open between the segments of two valves. B shows appearance of valves closed and open.

Valves of Veins

Valves of veins. A shows a vein cut open between the segments of two valves. B shows appearance of valves…

A, vein with valves open. B, vein with valves closed: stream of blood passing off by lateral channel.

Blood Flow in the Valves of Veins

A, vein with valves open. B, vein with valves closed: stream of blood passing off by lateral channel.

"<em>A</em>, part of a vein laid open, with two pairs of valves; <em>B</em>, longitudinal section of a vein, showing the valves closed." &mdash; Blaisedell, 1904

Vein

"A, part of a vein laid open, with two pairs of valves; B, longitudinal section of…

Vein laid open, showing it's valves.

Vein and Valves

Vein laid open, showing it's valves.

"Waldheimia flavescens. Interior of ventral valve. f, foramen; d, deltidium; t, teeth; a, adductor impressions; c, divaricator; d, accessory divaricators; b, ventral adjustor; b', peduncular muscle." &mdash; Encyclopedia Britanica, 1893

Ventral Valve

"Waldheimia flavescens. Interior of ventral valve. f, foramen; d, deltidium; t, teeth; a, adductor impressions;…