55G 



MANUAL OF HISTOLOGY. 



the dartos (p. 283), by formless connective-tissue. Finally, the whole is 

 covered by a thin layer of true skin quite destitute of fat. 



If we seek to remove the albuginea, we observe that numerous but im- 

 perfect fibrous septa are given off by the latter, and penetrate into the 

 interior of the gland. 



These partitions, which divide the parenchyma into lobules (fig. 544, 6) 



Flgr. 544. The human testicle, after Arnold, a, testicle 

 divided into lobuli b ; c, tubnli recti; d, rete vasculosum ; 

 e, vascula efferentia; /, coni vasculosi; g, epididymis; 

 h, vas rtef evens; f, vas aberrans of Nailer; in, branches of 

 the internal spermatic artery, with their arrangement in 

 the gland n; o, artery of the vas deferens, anastomos- 

 ing at^j with the last named vessel. 



Fig. 545. Seminiferous 

 tube from a human tes- 

 ticle, a, membrane; 6. 

 cells. 



of conical form, whose apices are directed inwards and upwards, con- 

 verge in the superior part of the organ, to be inserted into a dense wedge- 

 shaped mass known as the corpus Highmori, whose base is attached to the 

 albuginea. 



Each of these lobules is made up of several extremely long semini- 

 ferous tubules, about > 1128-0'1421 mm. in diameter, folded on them- 

 selves several times. These may be seen to divide frequently, and anas- 

 tomose, and to terminate, not blind, but in the form of slings and loops. 

 At the apices of the lobules the seminiferous tubules, becoming rapidly 

 narrowed, open into a straight passage, which goes by the name of the 

 tubulus rectus (c), and which penetrates the corpus Highmori (lined with 

 low columnar cells), and forms what is called the rete testis (d), by inter- 

 communication with the vessels of the same kind. From this network 

 the larger tubes, or vascula efferentia (e), take their rise. Their number 

 is from 9 to 17, and their course at first straight until they pierce the 

 albuginea, after which they become again very tortuous, and are arranged 

 in a series of conical lobes, known as the coni vasculosi (/), which form 

 the caput epididymis. 



