By O. P. Gobée, dept. of Anatomy and Embryology, Leiden University Medical Center , Last updated 22 Feb 2018
The internal abdominal oblique muscle explained in a drawing
By Prof. Marco DeRuiter, LUMC
A short fragment explaining the internal abdominal oblique muscle and the muscle that extends from it, the cremaster msucle.
(00m41s) 
The complete video can be seen here.
The internal abdominal oblique muscle explained in a drawing
By Dr. David Morton, Univ. of Utah.
A nice and concise explanation of the internal abdominal oblique muscle, and its aponeurosis in a drawing.
(00m26s) 
- This video describes the internal abdominal oblique as the third layer, because the author describes two layers of the external oblique muscle. To prevent confusions, be aware that in the textbooks it is uncommon to distinguish layers of the external oblique muscle, hence the internal abdominal oblique is most commonly described as the second, or middle layer of the lateral abdominal wall muscles.
- The complete video can be seen here.
The internal abdominal oblique muscle in a dissection
By Prof. Marco DeRuiter, LUMC
A short fragment from a dissection, demonstrating that the fibers of the internal abdominal oblique muscle run perpendicular to the fibers of the external oblique muscle.
(00m28s)
The complete video can be seen here.
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