The muscles in your stomach. If someone has a well developed mid-region they are said to have a "six-pack".
These are more commonly referred to as a “six pack” especially when they are well toned, they are the six muscles which are grouped in pairs and run down your stomach from the mid region to your navel.
Important for support of the spine, these muscles are the rectus abdominis, external oblique, internal oblique, and transversus.
A large group of muscles in the front of the abdomen that assists in the regular breathing movement and supports the muscles of the spine while lifting and keeping abdominal organs such as the intestines in place. Abdominal muscles play a key role in exercises such as "sit-ups." They are informally called the "abs".
the muscles in the abdominal wall surrounding the uterus and gut
The large group of muscles that assists in the regular breathing movement and supports the muscles of the spine while lifting and keeps other abdominal organs and intestines in place.
There are four abdominal muscles in the cat, namely, External Oblique, Internal Oblique, Transversus abdominis, and the Rectus Abdominis.