Linea semilunaris

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Linea semilunaris

The linea semilunaris (also known as the semilunar line) is a curved tendinous line found on the anterior abdominal wall. It is a significant anatomical feature that marks the lateral border of the rectus abdominis muscle.

Anatomy

The linea semilunaris extends from the cartilage of the ninth rib to the pubic tubercle. It is formed by the aponeuroses of the internal oblique muscle and the transversus abdominis muscle. The linea semilunaris is typically visible in individuals with well-developed abdominal muscles and low body fat.

Function

The primary function of the linea semilunaris is to provide structural support to the abdominal wall. It helps to maintain the integrity of the abdominal cavity and assists in the movement and stabilization of the trunk. The linea semilunaris also plays a role in the protection of the internal organs within the abdominal cavity.

Clinical Significance

The linea semilunaris is an important landmark in various surgical procedures, particularly those involving the abdominal wall. It is often used as a reference point for incisions and for the placement of surgical instruments. Additionally, the linea semilunaris can be involved in certain medical conditions, such as hernias, where the integrity of the abdominal wall is compromised.

Related Structures

• Linea alba
• Rectus sheath
• Inguinal ligament
• External oblique muscle
• Internal oblique muscle
• Transversus abdominis muscle

See Also

• Abdominal muscles
• Abdominal wall
• Hernia