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  2. Reflex syncope - Wikipedia

    en.wikipedia.org/wiki/Reflex_syncope

    Carotid sinus syncope is due to pressure on the carotid sinus in the neck. [2] The underlying mechanism involves the nervous system slowing the heart rate and dilating blood vessels, resulting in low blood pressure and thus not enough blood flow to the brain. [2] Diagnosis is based on the symptoms after ruling out other possible causes. [3]

  3. Carotid sinus - Wikipedia

    en.wikipedia.org/wiki/Carotid_sinus

    The carotid sinus is at the origin of the internal carotid artery. In human anatomy, the carotid sinus is a dilated area at the base of the internal carotid artery just superior to the bifurcation of the internal carotid and external carotid at the level of the superior border of thyroid cartilage. The carotid sinus extends from the bifurcation ...

  4. Syncope (medicine) - Wikipedia

    en.wikipedia.org/wiki/Syncope_(medicine)

    Syncope, commonly known as fainting or passing out, is a loss of consciousness and muscle strength characterized by a fast onset, short duration, and spontaneous recovery. [1] It is caused by a decrease in blood flow to the brain, typically from low blood pressure. [1] There are sometimes symptoms before the loss of consciousness such as ...

  5. Oculocardiac reflex - Wikipedia

    en.wikipedia.org/wiki/Oculocardiac_reflex

    The oculocardiac reflex, also known as Aschner phenomenon, Aschner reflex, or Aschner–Dagnini reflex, is a decrease in pulse rate associated with traction applied to extraocular muscles and/or compression of the eyeball. [1] The reflex is mediated by nerve connections between the ophthalmic branch of the trigeminal cranial nerve via the ...

  6. Strangling - Wikipedia

    en.wikipedia.org/wiki/Strangling

    Strangling involves one or several mechanisms that interfere with the normal flow of oxygen into the brain: [ 3 ][ 4 ] Compression of the carotid arteries or jugular veins —causing cerebral ischemia. Compression of the laryngopharynx, larynx, or trachea —causing asphyxia. Stimulation of the carotid sinus reflex —causing bradycardia ...

  7. Carotid body - Wikipedia

    en.wikipedia.org/wiki/Carotid_body

    The carotid body is a small cluster of peripheral chemoreceptor cells and supporting sustentacular cells situated at the bifurcation of each common carotid artery in its tunica externa. [ 1 ] [ 2 ] The carotid body detects changes in the composition of arterial blood flowing through it, mainly the partial pressure of arterial oxygen , but also ...

  8. Common carotid artery - Wikipedia

    en.wikipedia.org/wiki/Common_carotid_artery

    The common carotid artery arises directly from the aorta on the left and as a branch of the brachiocephalic trunk on the right. In anatomy, the left and right common carotid arteries (carotids) (English: / kəˈrɒtɪd / [1][2]) are arteries that supply the head and neck with oxygenated blood; they divide in the neck to form the external and ...

  9. Circle of Willis - Wikipedia

    en.wikipedia.org/wiki/Circle_of_Willis

    The circle of Willis (also called Willis' circle, loop of Willis, cerebral arterial circle, and Willis polygon) is a circulatory anastomosis that supplies blood to the brain and surrounding structures in reptiles, birds and mammals, including humans. [1] It is named after Thomas Willis (1621–1675), an English physician.