33 2 



PRACTICAL ANATOMY. 



osus in the male. Pull the penis upward and from side to side gently, and this 

 will bring the crura and their investing muscles into view. (Fig. 239.) 



6. The external spliineter aid you will see reaching from the tip and sides of 

 the coccyx, surrounding the anus, to the central perineal point. The outer 

 margins of this muscle seem to become lost in a quantity of fatty and connective 

 tissue. 



7. Another muscle, the superficial transversns perilled, lies between the 

 sphincter ani and the erector penis, extending in an oblique direction from the 

 tuberosity of the ischium to the central perineal point. 



8. Tlie central perineal point, or tendinous centre of the perineum, is in the 

 mid-line from side to side and about one inch in front of the anus. As you will 



Superficial perinceal vessels 



Accelerator urinae 



Colles'B fascia, turned back 



Erector penis 



Transverse perinceal vessels 

 Cut edge of triangular 



ligament 



SUPERFICIAL PERIXJEAL 

 NERVE GIVING OFF 

 TRA NS VERSE BRA NCH 

 Pudic vessels 



Inferior hamarrhoidal vessels 

 and nerves 



Glutens maximus 

 hooked back 



Dorsal artery of penis 

 Artery of crus 



Great sciatic ligament 

 Levator ani 

 External sphincter 



FIG. 230. THE ARTERIES OF THE PERINEUM. 

 On the right side Colics' fascia has been turned back to show the superficial vessels. On the left side the 

 superficial vessels have been cut away with the anterior layer of the triangular ligament to show tin- 

 deep vessels. 



demonstrate in your dissection, and as you may see in figure 229, this point is 

 where the following muscles meet: (i) The sphincter ani ; (2) the superficial 

 transversus perinaei ; (3) the accelerator urinae or bulbo-cavernosus. 



9. The levator ani shows well in both figures, but at this stage of the dissec- 

 tion is obscured by (i) the sphincter ani and (2) the large mass of fat in the 

 ischio-rectal fossa. The muscle is seen in figure 230 on each side of the anus. 



10. The space on each side of the anus is the ischio-rectal fossa. It is now 

 full of fat. Figure 230 shows this fat removed and the levator ani muscle 

 divested of the anal fascia. 



1 1. The greater saero-seiatie ligament must now be located. In the figures it 

 is shown cut on one side to expose the internal pudic structures. 



12. Notice the luzmorrhoidal branches t ami the perineal branches of the internal 



