Internal oblique innervation by which nerves?

Internal oblique innervation by which nerves?

• A. Iliohypogastric nerve
• B. Ilioinguinal nerve
• C. Iliohypogastric nerve and ilioinguinal nerve
• D. Subcostal nerve

Answer: (C)

Abdominal wall muscles are supplied by segmental nerves that run between muscle layers, so a given muscle often receives contributions from multiple nerves. For the internal oblique, the fibers are notably innervated by the iliohypogastric and ilioinguinal nerves, which arise from L1 and travel between the internal oblique and transversus abdominis to provide motor input (and also sensory input to the groin and suprapubic region). This combination of nerves covers the motor innervation of the internal oblique in the lower abdominal wall, making them the best answer. The subcostal and thoracoabdominal nerves also contribute to abdominal wall innervation, but the specific pair from L1 is the most defining motor supply for this muscle in typical testing contexts.

Abdominal wall muscles are supplied by segmental nerves that run between muscle layers, so a given muscle often receives contributions from multiple nerves. For the internal oblique, the fibers are notably innervated by the iliohypogastric and ilioinguinal nerves, which arise from L1 and travel between the internal oblique and transversus abdominis to provide motor input (and also sensory input to the groin and suprapubic region). This combination of nerves covers the motor innervation of the internal oblique in the lower abdominal wall, making them the best answer. The subcostal and thoracoabdominal nerves also contribute to abdominal wall innervation, but the specific pair from L1 is the most defining motor supply for this muscle in typical testing contexts.