HEAD & NECK ARTERIES Flashcards
Two arterial tracts that supply blood to the head and neck
(1) the carotid system
(2) the subclavian system
The ____ system delivers blood to the upper neck and the head.
carotid
The ____ system provides blood to the lower neck, deep neck, inside of the cranium, shoulder, upper limb, and thorax
subclavian
The common carotid artery runs upward through the neck within the ____
carotid sheath
The right common carotid artery arises from the ____ artery behind the right sternoclavicular joint
brachiocephalic
The left common carotid artery arises from the ____ in the superior mediastinum.
arch of the aorta
where the common carotid artery divides into the external and internal carotid arteries
carotid triangle of the neck
At its point of division, the terminal part of the common carotid artery shows a localized dilation, called the ____
carotid sinus
The wall of the carotid sinus is relatively thin because
its ____ is thinner than elsewhere
tunica media
the adventitia of the carotid sinus is relatively thick and contains numerous nerve endings derived from the _____
glossopharyngeal nerve
The carotid sinus serves as a reflex _____ mechanism
pressoreceptor (baroreceptor)
a rise in blood pressure causes a ____ of the
heart rate and ____ of the arterioles.
slowing
vasodilation
a small structure that lies posterior to the point of
bifurcation of the common carotid artery or in the angle of the bifurcation
Carotid Body
the carotid body is innervated by the ____ nerve
glossopharyngeal
The carotid body is a _____, being sensitive to excess carbon dioxide and reduced oxygen tension in the blood.
chemoreceptor
