230 



PRACTICAL ANATOMY. 



fibres, called the intercolumnar fibres. (6) Insert the forceps between the pillars 

 just mentioned, parallel to Poupart's ligament, for about two inches. They are 

 now in the inguinal canal. (Fig. 163.) Below them is the floor of the canal, the 

 upper surface of Poupart's ligament, and on this floor is the spermatic cord ; 

 external to them is the outer wall of the canal the aponeurosis of the external 

 oblique muscle ; above them is the roof of the canal the arched fibers of the 

 internal oblique and transversalis muscles ; internal to them is the inner wall of 

 the canal the conjoined tendon of the internal oblique and transversalis muscles 

 and the transversalis fascia. If you gently pull the spermatic cord, you will see 

 where it comes into view. This spot where the cord appears is the internal 



External intercostal 



Internal intercostal 



Posterior portion of 

 sheath of reotua 



Transversalis 

 abdoininis 



Fold of Douglaa 



Iliaous 



Transversalis fascia and 

 internal abdominal ring 



Conjoined tendon 



Poupart's ligament 



Gimbernat's ligament 



Serratua magnus 



Lumbar fascia 



FIG. 162. TRANSVERSALIS ABDOMJNIS AND SHEATH OK RKCTUS. 



abdominal ring in the transversalis fascia. Do not remove the forceps until you 



have re-read (6), i, e., the above geometrical description of the inguinal canal, 



and carefully studied. and learned the following: 



The inguinal canal has the following points : 



1. An external ring in the aponeurosis of the external oblique. (Fig. 161.) 



2. An internal ring in the transversalis fascia. 



3. A floor, the upper inner surface of Poupart's ligament. 



4. A roof, the arched fibres of the internal oblique and transversalis. 



5. An outer ,\v?//, the aponeurosis of the external oblique. 



6. An inner aW/, conjoined tendon, triangular ligament, transversalis fasc 



7. Contents: spermatic cord, male ; round ligament, female. 



