Pyramidalis innervation is provided by which nerve?

Pyramidalis innervation is provided by which nerve?

• A. Subcostal nerve
• B. Iliohypogastric nerve
• C. Ilioinguinal nerve
• D. Genitofemoral nerve

Answer: (A)

Pyramidalis is innervated by the subcostal nerve, which is the motor branch of the T12 ventral ramus. This nerve travels along the lower anterior abdominal wall and supplies the pyramidalis muscle. The iliohypogastric and ilioinguinal nerves (from L1) mainly innervate the external oblique, internal oblique, and transverse abdominis, and provide sensory to the groin region, not to pyramidalis. The genitofemoral nerve (L1–L2) supplies the cremaster muscle and skin of the anterior thigh/ groin area, not pyramidalis. So the subcostal nerve is the correct innervation.

Pyramidalis is innervated by the subcostal nerve, which is the motor branch of the T12 ventral ramus. This nerve travels along the lower anterior abdominal wall and supplies the pyramidalis muscle. The iliohypogastric and ilioinguinal nerves (from L1) mainly innervate the external oblique, internal oblique, and transverse abdominis, and provide sensory to the groin region, not to pyramidalis. The genitofemoral nerve (L1–L2) supplies the cremaster muscle and skin of the anterior thigh/ groin area, not pyramidalis. So the subcostal nerve is the correct innervation.