Head & Neck Arteries + Veins + Lymph Drainage Flashcards
The right common carotid artery arises from?
brachiocephalic artery behind the right sternoclavicular joint
The left common carotid artery arises from?
arch of the aorta in the superior mediastinum
bifurcation of common carotid arteries occurs at the level of?
upper border of thyroid cartilage
carotid sinus
- At its point of division, the terminal part of the common carotid artery or the beginning of the internal carotid artery shows a localized dilatation, called the carotid sinus
- The tunica media of the sinus is thinner
- the adventitia is relatively thick and contains numerous nerve endings derived from the glossopharyngeal nerve.
- baroreceptor
Carotid Sinus Hypersensitivity
In cases of carotid sinus hypersensitivity, pressure on one or both carotid sinuses can cause excessive slowing of the heart rate, a fall in blood pressure, and cerebral ischemia with fainting, (syncope)
Carotid Body
- it is a small structure that lies posterior to the point of bifurcation of the common carotid artery
- It is innervated by the glossopharyngeal nerve
- its a chemoreceptor, being sensi- tive to excess carbon dioxide and reduced oxygen tension in the blood. Such a stimulus reflexly produces a rise in blood pressure and heart rate and an increase in respiratory movements
Carotid Pulse
can be easily palpated just beneath the anterior border of the sternocleidomastoid muscle at the level of the superior border of the thyroid cartilage.
anterolateral relations of common carotid artery
The skin, the fascia, the sternocleido- mastoid, the sternohyoid, the sternothyroid, and the superior belly of the omohyoid
posterior relations of common carotid artery
The transverse processes of the lower four cervical vertebrae, the prevertebral muscles, and the sympathetic trunk
medial relations of common carotid artery
larynx
pharynx
trachea
esophagus
lateral Relations of the Common Carotid Artery
The internal jugular vein and the vagus nerve
external carotid artery supplies:
neck face scalp tongue maxilla
which structures cross the external carotid artery? (ant relations)
the anterior border of the sternocleidomastoid hypoglossal nerve posterior belly of digastric stylohyoid muscles facial nerve (in parotid gland)
medial relations of external carotid artery
pharynx internal carotid artery stylopharyngeus muscle glossopharyngeal nerve pharyngeal branch of the vagus
Branches of the External Carotid Artery (samflops)
Superior thyroid artery Ascending pharyngeal artery Lingual artery Facial artery Occipital artery Posterior auricular artery Superficial temporal artery Maxillary artery
The middle meningeal artery enters the skull through
foramen spinosum
internal carotid artery supplies
brain
eye
forehead
nose
internal carotid artery terminates by dividing into
anterior cerebral artery
middle cerebral artery