Rectus abdominis

A pair of muscles located in the anterior abdominal wall, playing a key role in core stability and motion.

The rectus abdominis is a long, flat muscle that extends vertically along the anterior wall of the abdomen. It is divided into left and right sections, often referred to as the 'abs.' This muscle is encapsulated in the rectus sheath and is important for trunk movement and stabilization.

Terminologia Anatomica

rectus-abdominis

System

Musculoskeletal system

Function

The primary function of the rectus abdominis is to flex the vertebral column, which helps in bending forward. It plays a crucial role in maintaining proper posture and core stability, allowing for efficient movement during various physical activities. Additionally, the rectus abdominis assists in intra-abdominal pressure regulation, which is vital during lifting or straining, aiding in activities such as childbirth and defecation. This muscle also contributes to the overall aesthetic aspect of the abdomen, as well-defined abdominal muscles are often associated with fitness and good health.

Location

The rectus abdominis is strategically located in the anterior part of the abdominal cavity, extending from the pubic symphysis upward to the cartilage of the fifth, sixth, and seventh ribs. This muscle is covered by a layer of skin and fascia, making it a prominent feature in the abdominal area. It lies parallel to the midline of the body, forming a key part of the body's core musculature. The muscle is separated into sections by tendinous intersections, contributing to its characteristic appearance.

Did You Know?

The rectus abdominis muscle is sometimes referred to as the 'six-pack muscle' due to its segmented structure.
In addition to its role in flexing the trunk, the rectus abdominis is crucial for maintaining balance and stability during physical activities.
Strengthening the rectus abdominis can lead to improved athletic performance and reduced risk of back injury.