Card 3 / 20: Horner's Syndrome consists of miosis, ptosis, and anhidrosis. These can all be explained as due to the interruption of:
A.)
Nerve III.
B.)
Oculomotor nucleus.
C.)
Hypothalamospinal and reticulospinal fibers.
D.)
Tuberal nuclei in the hypothalamus.
Answer:
C.) Hypothalamospinal and reticulospinal fibers.
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Interruption of descending hypothalamic fibers going to the spinal cord directly or indirectly through the reticular formation will result in Horner's Syndrome. In the medulla these axons are in the lateral region near the anterolateral system. However, interruption at any level between the hypothalamus and superior cervical ganglion can produce a Horner's.
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