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  2. Internal carotid artery - Wikipedia

    en.wikipedia.org/wiki/Internal_carotid_artery

    Segments of the internal carotid artery, delineated on an MRA of the head.. The internal carotid artery is a terminal branch of the common carotid artery; it arises around the level of the fourth cervical vertebra when the common carotid bifurcates into this artery and its more superficial counterpart, the external carotid artery.

  3. 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 ...

  4. Common carotid artery - Wikipedia

    en.wikipedia.org/wiki/Common_carotid_artery

    The common carotid artery is contained in a sheath known as the carotid sheath, which is derived from the deep cervical fascia and encloses also the internal jugular vein and vagus nerve, the vein lying lateral to the artery, and the nerve between the artery and vein, on a plane posterior to both. On opening the sheath, each of these three ...

  5. Circle of Willis - Wikipedia

    en.wikipedia.org/wiki/Circle_of_Willis

    Internal carotid artery (left and right) at its distal tip (carotid terminus) Posterior cerebral artery (left and right) at their P1 segments; Posterior communicating artery (left and right) The middle cerebral arteries, supplying the brain, are not considered part of the circle of Willis.

  6. Middle cerebral artery - Wikipedia

    en.wikipedia.org/wiki/Middle_cerebral_artery

    Middle cerebral artery Middle cerebral artery and its branches (patient has a hypoplastic A1 segment and an absent PCOM, resulting in a purely MCA angio from internal carotid artery injection) The middle cerebral artery divides into four segments, named by the region they supply as opposed to order of branching as the latter can be somewhat ...

  7. Anterior choroidal artery - Wikipedia

    en.wikipedia.org/wiki/Anterior_choroidal_artery

    The anterior choroidal artery typically originates from the internal carotid artery.It may (rarely) instead arise from the middle cerebral artery. [1]It originates from the distal internal carotid artery (ICA) 5 mm distal to the origin of the posterior communicating artery and just proximal to the terminal bifurcation of the ICA.

  8. Posterior communicating artery - Wikipedia

    en.wikipedia.org/wiki/Posterior_communicating_artery

    The fetal carotid origin of the PCA usually regresses as the vertebral and basilar arteries become dominant and it finds a new origin in the basilar artery. About 20% of adults retain PCA origin from the posterior communicating artery, and in turn, the internal carotid arteries. [4]

  9. Carotid sinus - Wikipedia

    en.wikipedia.org/wiki/Carotid_sinus

    The carotid sinus baroreceptor can be oversensitive to manual stimulation from the pressure applied at the carotid sinus at the carotid bifurcation. It is a condition known as 'carotid sinus hypersensitivity' (CSH), 'carotid sinus syndrome' or 'carotid sinus syncope', in which manual stimulation causes large changes in heart rate and blood ...