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A MANUAL OF ANATOMY 



the transverse measurement being i inch. The deep epigastric 

 artery Hes at first below, and then on the inner side of, the ring, the 

 vessel being here beneath the fascia transversahs. The reflected 

 tendon of Cooper may be upon the inner side of, and below, the 

 ring. On the outer side of the ring are the Poupart fibres of the 

 internal oblique, and above is the lower free border of the transver- 

 sahs. The fascia at the outer and lower parts of the ring is stronger 

 than elsewhere. 



, E.O.A. 



O.I. A. 



Intcrcolumnar 

 Fibres 



Saphenous External Abdominal 

 Opening Ring 



Reflected Tendon 

 of Cooper 



Fig. 287 — Superficial and Dbep Dissection of the Lower Part 

 OF THE Anterior Abdominal Wall (after Cooper). 



E.O.A. External Oblique Aponeurosis 

 O.I. A. Obliquus Internus Abdominis 

 T.A. Transversalis Abdominis 

 F.T. Fascia Transversalis 



I.A.R. Internal Abdominal Ring 

 B.C. Spermatic Cord 

 D.E.V. Deep Epigastric Vessels 

 X. Triangular Fascia 



Inguinal Canal. — ^The inguinal canal is the oblique passage in the 

 lower part of the anterior abdominal wall, which transmits the 

 spermatic cord, or round ligament of the uterus, according to the 

 sex, and also the inguinal nerve in its lower two-thirds. It is 

 situated immediately above the inner half of Poupart's ligament, 

 its direction being downwards, forwards, and inwards, and. it 

 is ij inches in length. The inlet to the canal is the internal 

 abdominal ring, the outlet being the external abdominal ring. 

 Its component parts are a floor, a roof, an anterior wall, and a 

 posterior wall. The floor in its upper two-thirds is formed 

 by the meeting between the fascia transversalis and Poupart's 

 ligament. This portion of it presents a groove, which lodges the 

 spermatic cord. In the lower third the floor is formed by the 



