MALE GENITAL SYSTEM: INTERNAL ORGANS 



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larger of the two foetuses examined (2-65 m.) the external portion of the penis was fully 

 extended, and the ratio of its length to that of the internal part was 1-3 : i-o. In the 

 smaller specimen the penis was partially retracted and measured 4-75 cm., while the 

 internal part measured 3-75 cm. The dimensions of the internal part were never seen 

 in the adult, but from external appearances it could not have measured more than about 

 a third of the length of the outer shaft of the organ. 



IHG F E D C B A 



k I m n op 



Fig. 3. Longitudinal sagittal section of penis and genito-urinary ducts in Fin whale. 



j. Interpelvic ligament. 



a. Terminal cone. 



b. Retractor penis muscle. 



c. Spongy portion of urethra. 



d. Corpus cavernosum. 



e. Panniculus carnosus. 



/. Ischio-cavernosus muscle. 

 g. Crus corporis cavernosi. 

 h. Triangular ligament. 

 i. Bulbo-cavernosus muscle. 



k. Rectum. 



/. Prostatic portion of urethra. 

 m. Compressor prostatae muscle. 

 n. Verumontanum with seminal pores. 

 0. Vas deferens. 

 p. Urinary duct. 



q. Urinary pore with crista urethrae. 

 r. Rectus abdominis muscle. 



A, B, C, D, E, F, G, H and /. Levels of transverse sections in Fig. 4. 



In describing the penis it has been decided to refer to the " anterior " and "posterior " 

 aspects of the organ, and to abandon the terms "ventral" and "dorsal", employed by 

 Daudt and other authors, in view of the central position of the penis in the middle line 

 of the body. 



Within the body the penis enlarges, as has been already stated, to form a pear-shaped 

 bulbus (Figs. 1, 2, 3). The greatest width of the bulbus is about one-third the extreme 



