Sympathetic System Functions in Head and Neck
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Sympathetic System Functions in Head and Neck

Test your knowledge of the sympathetic system's effects on the head and neck, including its impact on the eyes, eyelids, and salivary glands.

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Questions and Answers

What are the effects of Horner's Syndrome?

Miosis, ptosis, enophthalmos, redness or flushing of the face, anhydrosis

What happens to the blood vessels in the head and neck due to sympathetic supply?

Vasoconstriction of all blood vessels including cerebral blood vessels

What is the effect of sympathetic supply on the eye?

Causes pupillodilation and widening of the palpebral fissure

What effect does sympathetic supply have on heart stimulation?

<p>Stimulation of all cardiac properties</p> Signup and view all the answers

What is the function of sympathetic supply to salivary glands?

<p>Trophic secretory fibers leading to secretion of concentrated small viscous saliva rich in enzyme</p> Signup and view all the answers

Study Notes

Effects of Horner's Syndrome

  • Ipsilateral ptosis (drooping of the eyelid), enophthalmos (sunken eye), and anhidrosis (decreased sweating) on the same side as the lesion
  • Loss of sympathetic innervation to the face, resulting in unequal pupils and facial sweating

Sympathetic Supply to Blood Vessels

  • Causes vasoconstriction (narrowing of blood vessels) in the head and neck, diverting blood flow to more essential areas
  • Increases blood pressure and heart rate during the "fight or flight" response

Sympathetic Supply to the Eye

  • Dilates the pupil (mydriasis) and increases intraocular pressure
  • Relaxation of ciliary muscle, allowing the lens to focus on distant objects

Sympathetic Supply to Heart Stimulation

  • Increases heart rate and stroke volume, enhancing cardiac output
  • Enhances ventricular contraction force, further increasing cardiac output

Sympathetic Supply to Salivary Glands

  • Inhibits salivary secretions, reducing saliva production and resulting in dry mouth (xerostomia)

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