Question

Which of the following structure is not derived from external oblique muscle:

• A. Inguinal ligament
• B. Lacunar ligament
• C. Cooper ligament
• D. Linea Semilunaris

Answer 1

The Correct Option is D

The external oblique muscle is an important muscle in the abdominal wall, contributing to the formation of several anatomical structures. Let's evaluate the options to determine which structure is not derived from the external oblique muscle:

• Inguinal Ligament: This ligament is indeed derived from the external oblique aponeurosis. It runs from the anterior superior iliac spine to the pubic tubercle.
• Lacunar Ligament: Also known as Gimbernat's ligament, it is a reflection of fibers of the inguinal ligament and therefore also derived from the external oblique muscle.
• Cooper Ligament: More formally known as the pectineal ligament, it is an extension of the lacunar ligament onto the pecten pubis. This is indirectly related to the external oblique muscle through continuation from the inguinal ligament.
• Linea Semilunaris: This is a curved tendinous line found on either side of the rectus abdominis muscle. It is not derived from the external oblique muscle but rather is related to the rectus sheath.

Based on this analysis, the Linea Semilunaris is not derived from the external oblique muscle. Therefore, the correct answer is:

Linea Semilunaris