QS Study

Carotid Sinus is the slight dilatation seen in the termination of a common carotid artery. It is a baroreceptor that senses changes in systemic blood pressure and is located in the adventitia of the carotid bulb of the internal carotid artery.

Features: Here, the tunica media is thin, but adventitia is relatively thick. It is sensitive to pressure changes in the arterial blood at this level. It is located just above the bifurcation of the common carotid artery at the base of the internal carotid artery.

Nerve supply:

  1. Glossopharyngeal nerve. (This nerve feeds information to the brain, and this is used to regulate blood pressure.)
  2. Sympathetic nerves.

Carotid Sinus 1

Fig: Carotid Sinus

Functions: Acts as a baroreceptor & regulates blood pressure. The carotid sinus baroreceptors are innervated by the sinus nerve of Hering, which is a branch of cranial nerve IX (glossopharyngeal nerve).

Clinical significance

This can be used therapeutically in the treatment of resistant hypertension by baroreflex activation. It has an important structure in a variable and maintaining blood pressure. It contains baroreceptors which are sensitive to increases in arterial blood pressure and subsequent increased pressure and stretching of the arterial walls.

Related Study: