mastication Flashcards
what are the muscles of mastication?
temporalis.
masseter
medial pterygoid
lateral pterygoid
temporomandibular joint?
joint between mandible and temporal bone of cranium
quadrilateral masseter origin?
zygomatic arch
where does masseter insert?
lateral surface of mandible
masseter function?
elevate mandible
nerve supply for masseter?
mandibular division of trigeminal nerve (CN5)
Origin of Temporalis?
Frontal
parietal
temporal
sphenoid
where does temporalis insert?
coronoid process of mandible
how does temporalis elevate mandible?
vertical fibres
what temporalis fibres pull the mandible back
horizontal fibres
nerve supply for Temporalis?
mandibular division of trigeminal nerve
where is MEDIAL pterygoid muscle located?
medial to ramus
origin of medial pterygoid?
maxilla and sphenoid bone( lateral pterygoid plate)
where does medial pterygoid insert?
medial of ramus
function of medial pterygoid?
elevate mandible and side to side movement
nerve supply for medial pterygoid?
CN5
WHERE is LATERAL pterygoid located?
infratemporal fossa
origin of lateral pterugoid ?
sphenoid
what heads does lateral pterygoid have?
superior and inferior
where does superior head insert?
articular disk of TMJ
what does superior head control?
disk position when mouth closing
where does inferior head insert?
condiylar process of mandible
what does inferior head control?
translate mandible head anteriorly when opening
AND for side to side grinding
nerve supply of lateral ptery.?
CN5
bellies of digastric muscles?
anterior and posterior
where does anterior belly attach?
to mandible
where does posterior belly attach to?
mastoid process of temporal bone
how are 2 bellies connected?
by intermediate tendon attached to hyoid bones
diagastric muscle contracts?
pull mandible down and hyoid up
nerve supply for anterior belly?
CN5
nerve supply for posterior belly
branch of facial nerve (CN7)
trigeminal nerve function?
sensory innervation to face
mandibular division of Trigeminal nerve function?
motor supply to muscles of MAST.
