568 ANATOMY IX A NUTSHELL. 



areolar tissue. This coat lines the tunica albuginea and the various septa 

 within the testicle. 



2. The infundibuliform fascia (internal spermatic) is the fascia propria 

 and is a continuation downward of the transversalis fascia. 



:;. The cremasteric fascia (middle spermatic fascia) is composed of mus- 

 cular fibers (the ('remaster muscle) which are derived from the lower border 

 of the Internal oblique muscle. 



4. The intercolunmar fascia (external spermatic) which is closely adherent 

 to the dartos. 



5. The scrotum consists of two layers, (a) the integument which is more 

 or less pigmented and covered in the adult with scattered hair. A raphe is 

 present in the median line from which pass transverse wrinkles, (b) The dartos 

 which is a reddish, cellular, contractile tissue beneath the skin of the scrotum. 



1. The epididymis (upon the testis) lies at the posterior and superior part 

 of the testicle and consists of the globus minor which contains the efferent 

 duct, and the globus major composed of vasa efferentia and coni vasculosa. 

 If the epididymis were unraveled it would be a tube twenty feet long. 



The lobules of the testicle are contained in the spaces formed by the tra- 

 becular which divide the testicle into divisions. These lobules consist of the 

 tubuli seminiferi which consist of a basement membrane lined with a layer of 

 cuboidal cells in which are developed the spermatoza. The tubuli at the apices 

 of the lobules become straight and join the vasa reta which join the rete testes 

 in the mediastinum, the rete testes end in the vasa efferentia which per- 

 forate the tunica albuginea and form the coni vasculosa. 



Gubernaculum testis is a fetal cord attached to the lower end of the epidi- 

 dymis and to the bottom of the scrotum. It governs the descent of the testicle. 

 Its homologue is the round ligament of the female. 



The paradidymis (organ of Giraldes) is on the spermatic cord above the 

 epididymis. It represents the remains of the posterior part of the Wolffian 

 body, h is a closed tube. Its homologue is the paroophoron in the female. 



The duct of Kathke is a part of the duct of Muller which persists hi post- 

 natal life and remains patulous. The oviduct is the homologue of the dud of 

 Rathke. 



The sessile hydatid of Morgagni is the upper part of the duct of Muller, 

 which persists and is attached to the upper aspect of the testicle. The fimbria 

 of the oviduct is the homologue of the sessile hydatid of Morgagni. 



LESSON CXCVIII. 



The Organs oi Hearing. (Plates CCLXXX-CCLXXX VII, inclusive). 

 These organs consist of three portions. 



1. The external ear, which consists of (a) pinna or auricle which is not of 

 much importance physiologically, and (b) the meatus auditorius externus, 

 which is ;i canal leading inward to the tympanic membrane. 



2. The middle ear, which is composed of (a) the tympanum (an air chamber) 

 containing the malleus, incus, and stapes (the auditory ossicles ) and com- 



