What do the splanchnic nerves innervate?

The greater splanchnic nerve helps with the motility of the foregut and provides sympathetic innervation to the adrenal medulla. Specifically, it supplies the alimentary canal, liver, gallbladder, pancreas, adrenal medulla, and the spleen.

What is the difference between white and gray Rami Communicans?

The white ramus communicans carries preganglionic sympathetic fibers to the sympathetic chain, while the gray ramus contains postganglionic sympathetic fibers rejoining the spinal nerve. Both of these branches contain afferent fibers as well.

What is rami communicantes?

Medical Definition of ramus communicans : any of the bundles of nerve fibers connecting a sympathetic ganglion with a spinal nerve and being divided into two kinds: a : one consisting of myelinated preganglionic fibers. — called also white ramus, white ramus communicans.

What muscles are innervated by C3 and C4?

Ansa cervicalis (This is a loop formed from C1-C3 which supplies the four infrahyoid aka strap muscles), etc. ( thyrohyoid (C1 only), sternothyroid, sternohyoid, omohyoid)

  • Phrenic (C3-C5 (primarily C4))-innervates diaphragm and the pericardium.
  • Segmental branches (C1-C4)- innervates anterior and middle scalenes.

    • What does the greater and lesser splanchnic nerve innervate?

    A small amount of fibers of the greater splanchnic nerve travels towards the ipsilateral suprarenal gland to innervate the adrenal medulla and stimulate the release of catecholamines (epinephrine and norepinephrine).

    Why are white rami only T1 to L2?

    White rami communicantes are only found between spinal cord segments T1-L2 because there are no presynaptic sympathetic nerve fibers originating above or below those levels.

    Is rami communicantes motor or sensory?

    The rami communicantes contain autonomic nerves that carry visceral motor and sensory information to and from the visceral organs.

    What is innervated by the brachial plexus?

    The brachial plexus is a major network of nerves transmitting signals responsible for motor and sensory innervation of the upper extremities, including the shoulder, arm, and hand.