Tags: Anatomical Structure, Nerve.
The anterior divisions of the seventh eighth ninth tenth and eleventh thoracic intercostal nerves are continued anteriorly from the intercostal spaces into the abdominal wall; hence they are named thoraco-abdominal nerves (or thoracicoabdominal intercostal nerves).They have the same arrangement as the upper ones as far as the anterior ends of the intercostal spaces where they pass behind the costal cartilages and between the Obliquus internus and Transversus abdominis to the sheath of the Rectus abdominis which they perforate.They supply the Rectus abdominis and end as the anterior cutaneous branches of the abdomen; they supply the skin of the front of the abdomen.The lower intercostal nerves supply the Intercostales and abdominal muscles; the last three send branches to the Serratus posterior inferior.
