Which of the following is considered a superficial muscle of the core?

• A. Transversus abdominis
• B. Internal oblique
• C. Rectus abdominis
• D. Quadratus lumborum

Answer: (C)

Verified step by step guidance

1. Understand the concept of 'superficial' muscles: Superficial muscles are located closer to the surface of the body, as opposed to 'deep' muscles, which are located deeper within the body. Superficial muscles are often visible and play a role in movement and posture.
2. Review the anatomy of the core muscles: The core muscles include the rectus abdominis, transversus abdominis, internal oblique, external oblique, and quadratus lumborum. Each has a specific location and function within the abdominal and lower back region.
3. Identify the location of the rectus abdominis: The rectus abdominis is a long, flat muscle that runs vertically along the front of the abdomen. It is located just beneath the skin and is responsible for the 'six-pack' appearance, making it a superficial muscle.
4. Compare the rectus abdominis to the other options: The transversus abdominis is the deepest abdominal muscle, the internal oblique is located beneath the external oblique, and the quadratus lumborum is a deep muscle in the lower back. None of these are considered superficial.
5. Conclude that the rectus abdominis is the correct answer: Based on its anatomical position and visibility, the rectus abdominis is classified as a superficial muscle of the core.