carotid sinus

noun Anatomy.

specialized nerve end organs producing a slight dilatation of the carotid artery where it branches into the external and internal carotid arteries, responding to changes in blood pressure by mediating changes in the heartbeat rate.

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Origin:
1940–45

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Carotid sinus is always a great word to know.

So is fibula. Does it mean:

either one of the second pair of cranial nerves, consisting of sensory fibers that conduct impulses from the retina to the brain

the outer and thinner of the two bones of the human leg, extending from the knee to the ankle

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American Heritage

Medical Dictionary

carotid sinus n.
A dilation of the common carotid artery at its bifurcation into the internal and external carotids, containing baroreceptors that when stimulated cause slowing of the heart, vasodilation, and a fall in blood pressure.

American Heritage

Science Dictionary

carotid sinus
A dilated region that is located at the point of bifurcation of the carotid artery and contains pressure receptors (called baroreceptors), which upon stimulation cause slowing of the heart rate, vasodilation, and a decrease in blood pressure.

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-Henry Seidel Canby