804 DIRECTIONS FOR LABORATORY WORK 



tunica muscularis differ from that of the digestive tube? Character, 

 origin and relationship of the trigonum vesicse? 



(C) THE URETER. 



Make similar study and sketches (297, 298) of ureter cut trans- 

 versely. 



(D) THE URETHRA. 



Make similar study and sketches (299, 300) of female urethra. (The 

 male urethra should be studied in connection with the penis.) 



XVII. THE MALE ORGANS OF REPRODUCTION 



(Male Genital Apparatus) 



(A) THE TESTIS (Orchis). 



(1) Study a gross fresh specimen of a mammalian testis, with its 

 associated duct system. Identify: a, globus major (caput), globus minor 

 (cauda) and corpus of epididymis; b, ductuli efferentes (and coni vas- 

 culosi) ; c, ductuli abberentes (superior and inferior) ; d, ductus def- 

 erens; e, paradidymis; and f, the appendices testis and epididymis. 

 Sketch (301). 



(2) Study with hand lens a median longitudinal section of a mam- 

 malian testis. Identify: a, capsule; b, hilus; c, mediastinum (corpus 

 Highmori) with rete testis; d, lobular compartments (lobules of testis) ; 

 e, semniferous tubules (tubuli contorti) ; and f, tubuli recti. Sketch 

 (302). 



(3) Study under h.p. a stained section of an active mammalian testis 

 (e.g., mouse, guinea-pig, human). Sketch (303) a segment (or seg- 

 ments) of the wall showing besides the several phases of Spermogenesis 

 (viz.: a, spermogonium ; b, primary and c, secondary spermocytes both 

 resting and in mitosis d, spermatids in several stages of metamorphosis 

 into e, spermium or spermozoon), a Sertoli cell (sustentacular cell or 

 trophocyte) with attached spermia, forming a 'spermoblast'. Note also: 

 a, tunica vaginalis; b, tunica albuginea; c, tunica vasculosa; and d, 

 interlobular septa. Sketch h.p. (304) a portion of wall of : a, a tubulus 

 rectus; and b, (305) the rete testis. What is the form of a seminiferous 

 tubule? Its relation to the lobule of the testis? How may the testis be 

 classified among glands? 



(4) Study h.p. a section of the active testis of a grasshopper. Iden- 

 tify the successive stages in spermogenesis. Count the number of 



