Anatomy of mastication + trigeminal + maxillary artery Flashcards
What is the motor function of the trigeminal nerve?
what is the sensory?
which part of the brainstem does it originate?
how many divisions does it have?
which cranial formen does each travel through?
trigeminal nerve CV
- motor function- muscles of mastication
- sensory function- cutaneous sensation to face, surface of eye, nasal + oral cavities + general sensation to anterior 2/3 tongue
origin: lateral side of the pons
how many divisions does it have? it has 3 divisions
- trigeminal V1- opthalmic division- supra-orbital fissure- forehead
- trigeminal V2- maxillary division- foramen rotundum- anterior face
- tirgeminal V3- mandibular division- formen ovale- inferior face to jaw
how do you test integrity of the trigeminal nerve?
Trigeminal motor function is tested by palpating the masseter muscles while the patient clenches the teeth and by asking the patient to open the mouth against resistance.
if trigeminal nerve injured on one side, how will the jaw present?
If a pterygoid muscle is weak, the jaw deviates to that side when the mouth is opened.
What are the 4 bones of mastication
draw and label the mandible
- temporal bone
- sphenoid bone
- mandible
- zygomatic bone
muscles of mastication move the mandible at which joint?
they originate where and insert where?
which 4 mucles make them up?
- temperomandibular joint
- origin on the skull
- insert on the mandible
muscles of mastication
- masseter
- temporalis
- lateral pterygoid
- lateral pterygoid
which muscle of mastication is shown here?
it has 2 heads, a superficial and deep. Where do they each originate?
where do they insert?
what is their action bilaterally and unilaterally
innervation
blood supply
masseter
origin superficial- zygoamtic arch. deep- maxillary process both of the zygomatic bone
insertion both insert on the lateral aspect of the ramus and angle of the mandible
action- bilateral— elevates and protrudes the jaw unilateral—lateral deviation
Innervation V3 (mandibular branch) of the trigeminal nerve masseteric nerve
blood supply masseteric, facial and transverse facial artery
what is the name of the large fan shaped muscle that is found on the lateral aspect of the skull?
- origin
- insertion
- action bilateral and unilateral
- innervation
- blood supply
temporalis
origin tempoaral fossa of the zygomatic bone
insertion coronoid process and ramus of the mandible
action bilaterally retraction and elevation of the jaw. unilaterally lateral deviation
innervation V3
blood supply deep temporal arteries
what are the blue muscles in diagram?
which direction do the fibres run and therefore what is their overall function?
unilateral activation results in
- lateral pterygoid (superior to the media pterygoid)
- fibres run horizontally and the main action is to depress and protude the jaw
- side to side movement
what is the name of the orange and red muscle?
what is the main function
the medial pterygoid
elevates the jaw, closing it.
label the dural sinuses
what is the fucntino of the articular disc of the TMJ
function of:
masseter
temporalis (vertical fibres)
temporalis horizontal fibres
medial pterygoid
lateral pterygoid
allows for a greater range of movement around the TMJ
- masseter- elevation and protrusion
- temporalis (vertical fibres)- elevation
- temporalis horizontal fibres- retaction
- medial pterygoid- elevates and protrudes
- lateral pterygoid- protrusion and depression
what is the damger triangle of the face?
what rare occuranc can happen here
corners of the mouth to the bridge of the nose
retrograde infection from the nasal area via the opthalmic/ maxillary veins of the area through to the pterygoid venous plexus and then cavernous sinus
which cranial bone are the pterygoid plate a part of
in wat fossa would you find the pterygoid venous plexus
which muscles of mastication are associated with the pterygoid venous plexus
sphenoid
infratemporal plexus
medial and lateral venous plexus
which branch of the external carotid is the maxillary artery?
what does it supply?
what is the course of it?
7th
it supplies the deep structures of the face
arises posterior to the neck of the mandible, traverses the parotid, passes between sphenimandibular ligament and ramus of the mandible
