The course of the transversus abdominis is described as:

• A. Fans medially
• B. Lateral
• C. Downward
• D. Upward

Answer: (B)

The transversus abdominis is a significant muscle of the abdominal wall, known for its role in core stability and support of the abdominal organs. Its fibers run horizontally across the abdomen, which makes the description of its course align with a lateral orientation. This horizontal arrangement helps in creating intra-abdominal pressure during activities such as coughing or heavy lifting, and also acts to stabilize the pelvis and lower back.

In contrast, the other options describe movements or orientations that do not accurately reflect how the transversus abdominis is structured or functions. The mention of "fans medially," "downward," and "upward" indicates directions that are not representative of the muscle fibers' course. Recognizing the lateral trajectory of the transversus abdominis is essential for understanding its anatomical function and clinical relevance in speech and swallowing, as well as maintaining proper posture and support.