Which nerves are responsible for the innervation of the external abdominal oblique muscle?

The external abdominal oblique muscle is primarily innervated by the lower six thoracic spinal nerves. This innervation is crucial for the muscle's function, which includes aiding in the compression of the abdominal cavity, facilitating movements such as trunk flexion and rotation, and supporting the abdominal wall.

The lower thoracic spinal nerves (T7 to T11) specifically provide the necessary motor signals to the external abdominal oblique, making them essential for its contraction and functionality. Additionally, the subcostal nerve, which is derived from T12, also contributes to the innervation of the area where the external oblique is active, further emphasizing the role of the lower thoracic region in this muscle's innervation.

Understanding this innervation is vital for recognizing how abdominal muscles work together in movements and their role in postural stability and core strength.