44G THE TESTICLE. 



At the back of the testis and epididymis, beneath the fascia propria, 

 there is found, opposite the lower two-thirds of the testis, a consider- 

 able amount of unstriped muscular tissue, the inner muscular tunic of 

 Kolliker. 



Situated on the front of the globus major, somewhat to the outer side, 

 there is usually found one or more small pedunculated bodies formed by 

 an extension of the tunica vaginalis and containing connective tissue and 

 blood-vessels. These are the liydatkls of Morgagni. One of them of a 

 more regularly pyriform shape and more constant than the rest, lies 

 closely between the head of the epididymis and the testicle, and is 

 regarded as the remains of the foetal structure termed Miiller's duct. 



The testis is enclosed in a strong capsule, the tunica albuginea. 

 This is a dense unyielding fibrous membrane, of a white colour, and 

 of considerable thickness, which immediately invests the soft substance of 

 the testicle, and preserves the form of the gland. It is composed of 

 bundles of fibrous tissue, which interlace in every direction. The sur- 

 face is covered by the tunica vaginalis, except along the posterior 

 border of the testicle, where the spermatic vessels pass through and 

 the two extremities of the epididymis are attached. 



In the interior, the fibrous tissue of the tunica albuginea is pro- 

 longed from the posterior border, for a few lines into the substance 

 of the gland, so as to form within it an incomplete vertical sep- 

 tum, known as the corpus Highmoriamim, and named by Astley 

 Cooper med'iasUmmi testis. It extends from the upper nearly to 

 the lower end of the gland, and it is wider above than below. The firm 

 tissue of which it is composed is traversed by a network of seminal 

 ducts, and by the larger blood-vessels of the gland, which are lodged in 

 channels formed in the fibrous tissue. 



From the front and sides of the corpus Highmorianum numerous 

 slender fibrous cords and imperfect septa of connective tissue are given 

 oif in radiating directions, and are attached by their outer ends to the 

 internal surface of the tunica albuginea at diflFerent points, so as to assist 

 in maintaining the general shape of the testicle, and enclose the several 



Fig. 319. —Plan of a Vertical Skction of the Testicle, 



SHOWING the ArRANGEJIENT OF THE DuCTS. 



The true length and diameter of the ducts have been dis- 

 regarded, a, a, tubuli seminiferi coiled up in the separate 

 lobes ; b, vasa recta ; c, rete vasculosum ; d, vasa efi'erentia 

 ending in the coni vasculosi ; I, e, g, convoluted canal of the 

 epididymis ; h, vas deferens ; /, section of the back part of 

 the tunica albuginea ; i, i, fibrous processes running between 

 the lobes ; / to s, mediastinum 



lobes into which the substance of the gland is 

 divided. According to Kolliker plain muscular 

 fibres are prolonged upon these septula from 

 behind. The whole internal surface of the 

 tunica albuginea is covered by a multitude of 

 fine blood-vessels, which are branches of the 

 spermatic artery and veins, and are held together 

 by a delicate areolar web. Smiilar delicate ra- 

 mifications of vessels are seen on the various fibrous offsets of the 

 mediastinum, upon which the blood-vessels are thus supported in the 



