The abdominus transversalis, also known as the transversus abdominis, is a deep muscle located across the abdomen. It is the deepest (innermost) abdominal muscle and is situated underneath the rectus abdominus.
Origin, Insertion and Actions of the Abdominus transversalis muscle:
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More about the name of the abdominus transversalis muscle: In the context of anatomy, the word 'transverse' (and its derivatives) refers to structures positioned at right-angles, i.e. perpendicular, to the long axis of either the whole body, or a specific organ. It is usually obvious from the context whether the structure e.g. in this case the abdominus transversalis muscle, is named relative to the whole body, or to a specific organ. The abdominus transversalis muscle is so called due to its position relative to the whole body. Its fibres lie approximately perpendicular to the main (long) axis, or 'midline' of the body.
The approximate location of the abdominus transversalis muscle is shown on the diagram of human anterior muscles.
More about Muscles:
The following are some popular pages in the section about the human muscular system:
- The structure of muscle tissue
- The structure of muscle cells
- Labelled diagrams of the muscles in different parts of the body including anterior muscles, posterior muscles and facial muscles
- Types of muscle contractions
- Movements at joints
There are also more pages about the words used to describe muscles (terminology), the anatomy and physiology of muscles, muscular disorders and associated topics. See also books about sports medicine.
- Anterior Muscles
- Posterior Muscles
- Facial Muscles
- Muscle Terminology (Definitions)
- 1. Structure of Muscle
- 2. Structure of Muscle Cells
- 3. Muscle Filaments
- 4. Sliding Filament Theory
- 5. Neuromuscular Junction
- 6. Actions at Neuromuscular Junction
- Types of Muscle Contractions
- Muscular Disorders
- Effects of exercise on muscles