Which nerve is associated with the spinal level T12?

Which nerve is associated with the spinal level T12?

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

Answer: (A)

Spinal level T12 corresponds to the subcostal nerve, which is the ventral ramus of the 12th thoracic nerve. It travels just below the 12th rib and provides motor innervation to the lower part of the abdominal wall muscles, particularly the external oblique, with additional contributions to the deeper abdominal muscles, and carries sensory fibers to the skin of the lower abdomen and suprapubic area. The other nerves come from different levels—iliohypogastric and ilioinguinal nerves originate mainly from L1, while the genitofemoral nerve is from L1-L2—so they are not associated with T12.

Spinal level T12 corresponds to the subcostal nerve, which is the ventral ramus of the 12th thoracic nerve. It travels just below the 12th rib and provides motor innervation to the lower part of the abdominal wall muscles, particularly the external oblique, with additional contributions to the deeper abdominal muscles, and carries sensory fibers to the skin of the lower abdomen and suprapubic area. The other nerves come from different levels—iliohypogastric and ilioinguinal nerves originate mainly from L1, while the genitofemoral nerve is from L1-L2—so they are not associated with T12.