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Yes,they can be found that is the first order neurons .Hence leisions in the lateral medulla produce Horners syndrome.

The pupil is innervated by sympathetic and parasympathetic fibers. Pupillary dilation is mediated by a three- neuron sympathetic pathway that originates in the hypothalamus.

The first order (central) neuron descends caudally from the hypothalamus to the first synapse in the cervical spinal cord (C8-T2 level-also called the ciliospinal center of Budge). The descending sympathetic tract is in close proximity to other tracts and nuclei in the brainstem.

The second order (preganglionic) neuron destined for the head and neck exits the spinal cord and travels in the cervical sympathetic chain through the brachial plexus, over the pulmonary apex and synapses in the superior cervical ganglion. The superior cervical ganglion is located near the angle of the mandible and the bifurcation of the common carotid artery.

The third order (postganglionic) neuron for the orbit enters the cranium within the adventitia of the internal carotid artery into the cavernous sinus. Here the oculosympathetic fibers exit the internal carotid artery in close proximity to the trigeminal ganglion and the sixth cranial nerve and join the 1st division of the trigeminal nerve to enter the orbit. The fibers (long ciliary nerve) innervate the dilator muscles of the iris and the Müller's muscle in the upper and lower lid.

The vasomotor and sudomotor fibers to the face exit the superior cervical ganglion and ascend in the external carotid artery.

Pupillary constriction is produced by parasympathetic (cholinergic) fibers that travel with the third cranial (oculomotor) nerve

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Q: Can descending sympathetic tracts be found in medulla?
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