docdoc9 wrote:
A.
Horner's syndrome due to damage of sympathetic trunk
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| Tiff
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ipsilateral miosis - Choice A
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| paheli
It'sAllAboutGoodKarma
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Agree. A.
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| silver
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CORRECT ANSWER: A
Right sympathetic trunk lies posterior to the right internal jugular vein, and may be injured in this procedure. Preganglionic sympathetic nerve fibers will be damaged. These nerve fibers synapse in the superior cervical ganglion on postganglionic sympathetic neurons that innervate structures of the head. The dilator pupillae muscle (smooth muscle of the iris that dilates the pupil) is sympathetically innervated; paralysis of this muscle due to interruption of its innervation results in constriction of the pupil (miosis).
Dilation of the pupil (B) would result from paralysis of the sphincter pupillae muscle. This muscle is parasympathetically innervated and would not be affected in this injury.
An inability to abduct the eye (C) would result from paralysis of the lateral rectus muscle, which is innervated by the abducens nerve.
An inability to close the eye (D) would result from paralysis of the orbicularis oculi muscle. This muscle is innervated by the facial nerve.
The platysma muscle (E) is a skeletal muscle in the superficial fascia of the neck. It is innervated by the facial nerve.
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