Muscles of Facial expression and mastication Flashcards
muscles of facial expression develop from
2nd branchial arch
muscles of facial expression are supplied by what nerve
CN VII
what are muscles of facial expression like
where do muscles for facial expression originate from and insert
thin
facial bones to insert on facial skin ( except platysma)
what are the facial muscle groups
muscle of the forehead (frontais as part of occipitofrontalis)
muscles of the mouth
muscles of the eyelids
muscles of the nose
platysma
what are the muscles of the mouth
-orbicularis oris
-zygomaticus major
-zygomaticus minor
-levator labii superioris
-levator labii superioris alaque nasi
-buccinator
-depressor anguli oris
-depressor labii inferioris
-mentalis
-risorius
-platysma
what are the muscles of the eyelids
orbicularis ocui which has an orbital and palpebral part
where does orbicularis oculi origin and insert
medial palpebral ligament to insert on lateral palpebral raphe
what muscles are around the eye and what do they do
corrugator supercilii- draws eyebrows together
orbicularis oculi- closes the eyes
procerus- pulls down the skin of the forehead
nasalis- widens the nostrils
whats the origin and insertion of risorius muscle and what does it do
parotid fascia and buccal skin to insert at angle of mouth
its part of the dilators of mouth (for smiling)
what is the origin and insertion of the depressor anguli oris and what does it do
anterolateral base of mandible to insert in angle of mouth
it depresses labial commissure bilaterally to from (makes you look sad)
whats the origin and insertion of procerus + transverse part of nasalis and whats its action
fascia aponeurosis covering nasal bone and lateral nasal cartilage to insert in skin of inferior forehead between eyebrows
it depresses medial end of eyebrows, wrinkles skin over dorsum of nose (makes you show dislike)
whats the origin and insertion of the alar part of nasalis + levator labii superioris alaeque nasii and whats its action
frontal process of maxilla to insert in major alar cartilage
it depresses ala laterally, dilating anterior nasal aperture i.e. flaring nostrils (makes you show anger)
whats the origin and insertion of orbicularis oris and whats its action
medial maxilla and mandible + deep surface of peri oral skin + angle of mouth (modiolus) to insert in mucous membrane of lips
tonus closes oral fissure
phasic contraction compresses and protrudes lips (kissing) or resists distension (when blowing)
whats the origin and insertion of orbicularis oculi and whats its action
medial orbital margin+ medial palpebral ligament + lacrimal bone to insert in skin around margin of orbit + superior and inferior tarsal plates
it closes eyelids i.e. palpebral part does so gently and orbital part tightly ( makes you wink)
whats the origin and insertion of depressor labii inferioris and what is its action
platysma and anterolateral body of mandible to insert in skin of lower lip
its part of the dilators of the mouth
it retracts (depresses) and/ everts lower lip ( pouting, sadness)
whats the origin and insertion of the zygomaticus major and whats its action
lateral aspect of zygomatic bone to insert in angle of mouth
its part of dilators of mouth
it elevates labial commissure bilateral to smile (happiness)
unilaterally to sneer (shows disdain)
whats the origin and insertion of platysma and what is its action
subcutaneous tissue of infraclavicular and supraclavicular regions to insert in base of mandible + skin of cheek and lower lip + angle of mouth + orbicularis oris
it depresses mandible (against resistance)
it tenses skin of inferior face and neck (showing tension and stress)
whats the origin and insertio of the corrugator supercilii muscle and its action
frontal bone at the medial end of the superciliary arch to insert in skin above the middle of the supraorbital margin
it draws eyebrow medially and inferiorly creating vertical wrinkles above nose (showing concern or worry)
whats the arterial and nerve supply of corrugator supercilii
branches from the superficial temporal and ophthalmic arteries
temporal branches of the facial nerve
whats the buccal pad fat
brown fat for heat generation especially for children
where is the buccal pad fat
between masseter and buccinator muscles
whats the arterial supply of the scalp
branches of either the external carotid artery / ophthalmic artery which is a branch of the internal carotid artery
what arteries of the face come from the external carotid artery
facial artery
superficial temporal artery
transverse facial artery
what arteries of the face come from the internal carotid artery
supraorbital artery
supratrochlear artery
