. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. TESTICLE (NORMAL ANATOMY). thelial cells. There is no appearance of an intertubiilar substance ; the ducts are merely connected by a loose network of vessels, and consequently readily admit of being sepa- rated and unravelled. The tubes, when suc- cessfully injected with quicksilver, form a beautiful anatomical preparation. Sir A. Cooper succeeded in filling the tubes with size injection ; but he has not described the mode in which it was effected, and other anatomists have failed in similar attempts.* When the tubuli se
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. TESTICLE (NORMAL ANATOMY). thelial cells. There is no appearance of an intertubiilar substance ; the ducts are merely connected by a loose network of vessels, and consequently readily admit of being sepa- rated and unravelled. The tubes, when suc- cessfully injected with quicksilver, form a beautiful anatomical preparation. Sir A. Cooper succeeded in filling the tubes with size injection ; but he has not described the mode in which it was effected, and other anatomists have failed in similar attempts.* When the tubuli seminiferi are unravelled, they are found to divide and form numerous anastamoses, which increase in frequency to- wards the circumference of the testicle. "(See diagram,/g. 633. a1 a1). The tubuli thus form one vast network of communication, so that it is impossible to isolate completely either a duct or a lobule. The credit of making this interest- ing discovery of the anastamoses of the se- minal tubes is due to Lauth. In only one instance did he succeed in finding a duct, ter- minating in a blind pouch, and this he regarded as exceptional. Blind ends have been found, however, more frequently by Krause. The anastamoses of the tubules have been observed in the rat and other animals as well as in man. The convolutions of the seminal tubes di- minish in number as they approach the me- diastinum, and cease altogether at a distance of from one to two lines, where two or more unite to form a single straight duct, termed vas rectum, which joins the rete testis at a right angle (a~ a"). The vasa recta are very slender, and easily give way when injected: their calibre, which is greater than that of the seminal tubes, is estimated by Lauth at y^th Fig. Diagram of the testicle. (After Lauth.') a a a, tubuli; a1 a1, subdivisions and anastamoses of the tubuli; a"2 a1*, vasa recta. The other references are the same as in fig. C32. *_Sir A. Cooper's beautiful preparatio
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