Lecture 2: arterial supply and venous drainage Flashcards
left common carotid artery is a branch off
the aortic arch
right common carotid artery is a branch off
the brachiocephalic trunk
the common carotid artery ascends within the neck to the superior border of the
thyroid cartilage / C3-C4 vertebral levels
common carotid artery bifurcates into
external carotid and internal carotid arteries
common carotid artery ascends medially to the ____ and _____ ascends posteriorly
- internal jugular vein
- vagus nerve
internal carotid artery passes deep to
the posterior belly of digastric and stylohyoid muscles
internal carotid artery is crossed by the
hypoglossal nerve
internal carotid artery ascends anterior to
transverse processes of C1-C3 to reach the bas of the skull
major source of blood to brain and orbit
internal carotid artery
4 parts of the internal carotid artery
- cervical
- petrous
- cavernous
- cerebral
cervical part of the internal carotid artery
bifurcation of common carotid artery to lower end of the carotid canal
petrous part of the internal carotid artery
passes through the carotid canal (in petrous temporal bone)
cavernous part of the internal carotid artery
courses through the cavernous sinus (along the body of the sphenoid)
cerebral part of the internal carotid artery
after pierced the dura (near anterior clinoid process) the ICA gives off the ophthalmic artery before terminating as the anterior and middle cerebral arteries
ophthalmic artery
- emerges from the internal carotid right after leaving the cavernous sinus
- enters orbit via optic canal
ophthalmic artery branches
- supraorbital (forehead)
- supratrochlear (forehead)
- lacrimal
- ciliary
- ehtmoidal
- muscular
external carotid artery passes deep to
posterior belly of digastric and stylohyoid muscles
external carotid artery passes posterior to
ramus of the mandible where it is embedded in the parotid gland
external carotid artery main supply
structures external to the skull
external carotid artery branches
- superior thyroid artery
- ascending pharyngeal artery
- lingual artery
- facial artery
- occipital artery
- posterior auricular artery
- maxillary artery (terminal branch)
- superficial temporal artery (terminal branch)
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superior thyroid artery
- deep to infrahyoid muscles to reach thyroid
- gives off branches to local muscles ( infrahyoid muscles and SCM)
- gives rise to the superior laryngeal artery
superior laryngeal artery
- branch off the superior thyroid artery
- supplies the larynx
ascending pharyngeal artery
- ascends between the internal carotid artery and pharynx to the base of the skull
- sends branches to the pharynx
lingual artery
- from anteromedial aspect of external carotid
- crossed by hypoglossal nerve
- deep to stylohyoid
- posterior to digastric muscles
- deep to hyglossus
- primary blood supply to the tongue and floor of the oral cavity
facial artery
- deep to digastric and stylohyoid muscles and medial to the rams/angle of the mandible
- gives off the submental artery before entering the face
facial artery branches
- inferior labial artery
- superior labial artery
- lateral nasal branch
- angular artery (terminal branch of the facial artery)
angular artery anastemosis with
the ophthalmic artery
occipital artery
- parallel and deep to the posterior belly of digastric as it courses to the posterior scalp
- has branches that supply the scalp and muscles in the area
posterior auricular artery
- ascends posteriorly between the external acoustic meatus and mastoid process
- gives branches the posterior auricle and muscles in the area
superficial temporal artery
- terminal branch
- originates within the parotid gland
- enters the temporal fossa
- terminates by dividing into frontal and parietal branches
maxillary artery
- terminal branch
- arises within the parotid gland
- passes medial to mandible to enter the infra temporal fossa
- may pass superficial or deep to lateral pterygoid muslce
- passes through the pterygomaxillary fissure to enter the pterygopalatine fossa