Question

3 routes for nerve fibers lesving the sympathetic chain what path do they take snd what to they innervate ?

Answer 1

The nerve fibres of the sympathetic chain takes these routes.

1. Spinal nerve route.

The postganglionic that exit the grey ramus reach the spinal nerve or its subdivision and travel to the effector organ. This innervates the sweat glands, piloerector muscle and blood vessels of skin and skeletal muscle.

2. Sympathetic nerve route.

This is by the nerves that exit postganglions to innervate the heart,thoracic blood vessels, lungs. There appears plexus around carotid artery which supplies nerve fibres to the effector of head. Some fibtes reach heart by leaving the supranerve ganglion from the cardiac nerve.

3. Splanchnic nerve route.

This fibres start from the spinal nerves of T5 to T12 and without synapsing pass through the ganglia. After that they form lumbar splanchich nerves. Then to collateral ganglia nd then reach the network of the abdominal aortic plexus. There is the presence of celiac ganglion, superior mesenteric ganglion and inferior mesenteric ganglion and with the arteries. From there the fibres reach target organs. They innervates stomach, small intestine, liver, spleen, colon, urinary bladder and reproductive organs.