The skin of the anterior abdominal wall is innervated by the ventral rami of the lower five or six thoracic (tho-racoabdominal) spinal nerves that continue from the intercostal spaces into the abdominal wall (Fig. 1.5). The anterolateral abdomen also receives nerve fibers from the subcostal, iliohypogastric, and ilioinguinal nerves.
A typical intercostal nerve runs across the deep surface of the internal intercostal muscle and membrane between the internal and innermost intercostal muscles. It then continues in the costal groove below the in
T 10 intercostal nerve T 11 intercostal nerve T 12 intercostal nerve
Fig. 1.5. Course of the thoracoabdominal nerves
tercostal artery. Each intercostal nerve is connected to an adjacent sympathetic ganglion by a white communicating ramus conveying presynaptic sympathetic fibers, and by a gray communicating ramus that transmits postsynaptic sympathetic fibers.
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