There are four abdominal muscles in the cat, namely, External Oblique, Internal Oblique,
Transversus abdominis, and the Rectus Abdominis.
External Oblique
It is the large and outermost abdominal muscle you will first see in dissection. Its fibers are running obliquely downward,
hence the name. It is covered anteriorly by the Latissimus Dorsi. Origin, on the
ribs and in the lumbodorsal fasica, Insertion, aponeurosis that passes through the linea alba, Action, constrictor of the
abdomen.
Internal Oblique
Transversus Abdominis
This muscle is the innermost abdominal muscle. Origin, second sheet of the lumbodorsal fascia and the pelvic girdle.
Insertion, linea alba, Action, compressor of the abdomen.
Rectus Abdominis
To see this muscle, first remove the extensive aponeurosis situated on the ventral suface of the cat. Its fibers are extremely
longitudinal, on each side of the linea alba. It is also traversed by the inscriptiones tendinae, or what others call
myosepta.
See also
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