Monday, December 28, 2015

Diaphragm Innervation

The diaphragm, which is a muscular membrane that separates the abdominal cavity from the thoracic one, is innervated by the phrenic nerve, which arises from the cervical segment of the spinal cord, from C3 to C5, with C4 contributing with about 70% of the fibers that compose it. The right and left phrenic nerve supply only motor fibers to the diaphragm. Although they arise as branches of the cervical plexus, they have their nerve center in the reticular formation of the medulla oblongata, which sends motor signals to the diaphragm through the phrenic nerve.