the common carotids and infra temporal fossa Flashcards
where is most of the blood supply to the head and neck derived from?
the common carotid arteries
describe the branching pattern of the common carotid arteries?
typically the only branches of the common carotids are the terminal branches of the internal and external carotid arteries
what are the regional branches of the external carotid artery?
anterior, posterior, deep and terminal branches
where do posterior branches of the external carotid artery supply?
the scalp
where do deep branches of the external carotid artery supply?
they contribute to the blood supply of the pharynx
where do the anterior branches of the external carotid artery supply?
the thyroid gland, structures. of the oral cavity and soft tissues of the face
where does the external carotid artery end and what are the terminal branches?
ends in the parotid gland
terminal branches are the superficial temporal artery and maxillary artery
where does the superficial temporal artery supply?
the lateral side of the face and scalp
where does the maxillary artery lie and where supply?
lies in the infra temporal fossa
forms branches that supply structures in the ear, nose, mouth, pharynx and meninges
where does the infratemporal fossa lie?
between the ramus of the mandible and the base of the skull
what is the area that the foramen ovale opens into?
the infra temporal fossa
how does the middle meningeal artery enter the skull?
it passes from the infratemporal fossa into the foramen spinousum to enter the skull
what are the boundaries of the infratemporal fossa?
anterior - posterior surface of maxilla
posterior - styloid process
superior - infra temporal surface of the greater wing of sphenoid
media - lateral pterygoid plate
lateral - ramus of the mandible
what are the contents of the infra temporal fossa (6 things)?
lateral and medial pterygoid
mandibular division the trigeminal nerve and its branches
maxillary artery and branches
pterygoid venous plexus
chords tympani
otic ganglion
explain the course of the mandibular division of the trigeiminal nerve
the mandibular division passes through the foramen ovale and into the infra temporal fossa where it gives branches that supply the muscles of mastication and sensory nerve to the teeth and oral cavity
what branch of the mandibular division of the trigeminal nerve supplies the lower teeth and skin over the mandible ?
the inferior alveolar branch
what branch of the mandibular division of the trigeminal nerve supplies the skin anterior to the auricle?
the auriclotemporal nerve
where does the maxillary artery arise from?
it is a branch of the external carotid artery
where does the maxillary artery supply?
muscles of mastication
the dura
the lower teeth
the cheek
describe the innervation of the upper teeth
the mandibular division of the trigeminal nerve passes between the heads of lateral pterygoid to send branches to the upper teeth
what are the divisions of the maxillary artery that arise as it crosses the infra temporal fossa?
mandibular
pterygoid
pterygopalatine
what is the pterygoid venous plexus?
a small connective network of veins surrounding the lateral pterygoid that is usually difficult to see
where does the ptyerygoid venous plexus communicate w/?
w/ the cavernous venous sinus inside the skull and the facial vein that drains the superficial structures of the face
where does the chorda tympania arise from and where does this occur?
arises from the facial nerve as it passes through the temporal bone
explain the course of the chorda tympani
it crosses the handle of the malleus and ossicle in the ear and then passes through a bony canal to reach the infratemporal fossa where it joins the lingual nerve and parasympathetic fibres and special sense of taste fibres and ten runs w/ the lingual nerve into the oral cavity
where does the otic ganglion lie?
at the mouth of the foramen ovale
