444 LABORATORY MANUAL OF HUMAN ANATOMY 



Nerves. 



(a) Dorsal nerve of penis (N. dorsalis penis). (Vide Toldt, Fig. 1291.) 

 Do any branches of this nerve pass to the muscles of the middle 

 perineal compartment? 



Examine also 



(a) Bulbo-urethral glands (glandulae bulbo-urethrales [Cowperi]). 



(aa) Body of gland (corpus glandulae bulbo-urethralis) . 



(ab) Excretory duct (ductus excretorius) . 



(b) Membranous part of urethra (pars membranaceae urethrae). 



Observe that this is the most fixed portion of the urethra. 



Note that the rectum passes posteriorly and the urethra ante- 

 riorly. A triangle is thus formed, the base of which is the skin. 

 This is known as the " recto-urethra! triangle." 



For a description of this triangle and its contents see Poirier et 

 Charpy, t. v. p. 140. 



The dissection may now be completed on the other side. 

 Leave the muscles intact, preserving relations. 



UROGENITAL KEGION (EEGIO UROGENITALIS) IN 



THE FEMALE. 



Before proceeding to the dissection, review the embryology 

 of the external genital parts. (Vide Kollmann, Lehrbuch der 

 Entwickelungsgeschichte des Menschen, pp. 434, 435.) What 

 are the genital ridge, the genital folds, the genital eminence, and 

 the urogenital sinus ? Observe the following : 



External Genital Parts in Female (Partes genitales externae), (Fig. 

 230.) 



(a) Pubic eminence (mons pubis). 



(b) Vulva (pudendum muliebre). 



(c) Labium majus of vulva (labium majus pudendae). 



(d) Anterior labial commissure (commissura labiorum anterior). 



(e) Posterior labial commissure (commissura labiorum posterior). 



(f) Frenulum of pudendal labia (frenulum labiorum pudendi). 



(g) Pudendal slit (rima pudendi). 



(h) Navicular fossa (fossa navicularis [vestibuli vaginae]), 

 (i) Labium minus of vulva (labium minus pudendi). 

 (j) Vestibule of vagina (vestibulum vaginae), 

 (k) Orifice of vagina (orificium vaginae). 

 (I) Clitoris (clitoris). 



(la) Body of clitoris (corpus clitoridis). 



(Ib) Glans of clitoris (glans clitoridis). 



(Ic) Prepuce of clitoris (praeputium clitoridis). 



(Id) Frenulum of clitoris (frenulum clitoridis). 



