Transverse abdominis

A vital core muscle that plays a crucial role in stabilizing the pelvis and spine.

The transverse abdominis is a deep abdominal muscle that lies beneath the rectus abdominis and external oblique muscles. Shaped like a corset, it is the innermost layer of the abdominal wall and extends from the rib cage all the way to the pelvis. Its fibers run horizontally across the abdomen, providing support and structure.

Terminologia Anatomica

transversus-abdominis

System

Muscular system

Function

The transverse abdominis plays a significant role in core stability and abdominal compression. Its primary function is to stabilize the lumbar spine and pelvis before any movement of the limbs occurs. By contracting, it increases intra-abdominal pressure, which helps protect internal organs during physical activity and stabilizes the spine during lifting or various exercises. This muscle is essential for maintaining proper posture and alignment of the body, as it helps to prevent excessive movement that could lead to injuries. Additionally, it contributes to the functional support of the pelvic floor, playing a crucial role in movements like bending, lifting, and twisting, which are part of daily activities.

Location

The transverse abdominis is located deep within the abdominal cavity, lying beneath the external oblique and internal oblique muscles. It spans horizontally across the abdomen, originating from the lower ribs, the thoracolumbar fascia at the back, and the iliac crest of the pelvis. It inserts into the linea alba, a fibrous structure that runs along the midline of the abdomen, and its position makes it an integral part of the core muscle group. As the deepest layer of the abdominal wall, it provides a supportive harness to the abdominal organs, contributing to their protection and overall stability.

Did You Know?

Training the transverse abdominis is crucial for core strength and injury prevention, especially in athletes.
This muscle is often referred to as the 'natural weight belt' for its ability to support the spine and pelvis during activities.
Weakness in the transverse abdominis can lead to issues such as lower back pain and pelvic instability.