Ramification of the intercostal nerves in the rhesus monkey (Macaca mulatta) with special reference to the innervation of the intercostal muscles.

Detailed dissection was performed on the ventral primary rami from the first thoracic to the second lumbar nerves in order to obtain more comprehensive data of the ramification of the intercostal nerves in the rhesus monkey. The nerves to the intercostalis intimus and internus and the obliquus externus abdominis tended to arise as a common trunk from the main intercostal nerve. A comparison of the intercostal nerve ramification with that in man is included.