Which of the following most accurately describes the location of the transversus abdominus muscle?

The transversus abdominus muscle is located posterior to the internal oblique muscle. This muscle forms the deepest layer of the abdominal wall and plays a crucial role in core stability and intra-abdominal pressure regulation. Understanding the anatomical relationships of these muscles is important for both diagnostic imaging and clinical practice.

In anatomical terms, the transversus abdominus is situated beneath the internal oblique and external oblique muscles. This positioning means that when viewing the abdominal muscles from a lateral perspective, the transversus abdominus lies directly underneath the internal oblique muscle. This arrangement is typical in the organization of the abdominal wall muscles, which work in concert to provide structural support and facilitate movement. The correct identification of these layers is essential for sonographers when assessing abdominal anatomy, differentiating between various structures, and identifying abnormalities.