The Muscles 113 
Obliquus Abdominis Internus (Petit oblique, Ob- 
liquus internus, Subcostalis). Arises as a flat muscle 
layer first with a strong tendinous portion from 
the anterior dorsal border of the os pubis and 
from the there-located cartilaginous inscriptio 
tendinea of the rectus; second, by a dorsal por- 
tion, with a short tendon, from the anteromedial 
surface of the pubo-iliac articulation from the 
pubis and ilium equally; third, from the dorsal 
anterior ends of the last named bones. It is 
inserted somewhat mediad to the lateral border of 
the rectus ventralis muscle that covers it on the 
outside. 
Transversus Abdominis (Transverse, Oblique 
Bauchmuskel, Innerer Bauchmuskel, Transversus 
ventralis). This muscle springs by short, flat, 
indistinct forks from the inner surface of the prox- 
imal ends of the dorsal ribs but does not reach the 
centra of the vertebre because of the long, broad 
transverse processes. Caudally the origin passes 
dorsalward to the lateral border of the quadratus 
lumborum muscle between which and the ileo- 
costalis muscle it is attached to the end of the 
transverse process. 
Rectus Abdominis (Gerader Bauchmuskel + pyra- 
midenformiger Muskel, Pyramidalis, Rectus ab- 
dominis+pyramidalis). This muscle consists, in 
the Crocodilia, of several very distinct parts: 
I. The rectus ventralis, the chief part, arises 
as a fleshy tendon from the sternum and from the 
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