Which muscle is located on the front of the abdomen and helps flex the spine?

Which muscle is located on the front of the abdomen and helps flex the spine?

• A. Rectus abdominus
• B. Pectoralis major
• C. Quadriceps femoris
• D. Deltoid

Answer: (A)

The muscle that sits along the front of the abdomen and bends the spine is the rectus abdominis. It runs vertically from the pubic bone up to the lower ribs and the xiphoid process. When it contracts, it pulls the upper body toward the pelvis, producing spinal flexion (bending forward at the waist). This muscle helps with posture and also aids in forced exhalation by increasing intra-abdominal pressure. The other listed muscles have different roles: the pectoralis major moves the shoulder, the quadriceps femoris extends the knee, and the deltoid raises the arm.

The muscle that sits along the front of the abdomen and bends the spine is the rectus abdominis. It runs vertically from the pubic bone up to the lower ribs and the xiphoid process. When it contracts, it pulls the upper body toward the pelvis, producing spinal flexion (bending forward at the waist). This muscle helps with posture and also aids in forced exhalation by increasing intra-abdominal pressure. The other listed muscles have different roles: the pectoralis major moves the shoulder, the quadriceps femoris extends the knee, and the deltoid raises the arm.