Superficial Face and Muscles of Facial Expression Flashcards
what is the skin over the mandible supplied by
the cervical plexus and great auricular nerve (c2 and C3)
where does CN VII enter the skull
via the internal acoustic meatus
where does CN VII exit the skull
the stylomastoid foramen
what pharyngeal arch are the facial nerve and facial muscles derived from
second pharyngeal arch
what are the 5 terminal branches of the facial nerve
temporal
zygomatic
buccal
marginal mandibular
cervical
what is technically the sixth branch of the facial nerve that arises
posterior auricular
origin and insertion of the frontal belly of occipitofrontalis
O = epicranial aponeurosis
I = skin/ subcutaneous tissue of eyebrows and forehead
what is the origin and insertion of the occipital belly of the occipitofrontalis
O = lateral 2/3rds of superior nuchal line
I = epicranial aponeurosis
action of the occipitofrontalis
wrinkles the forehead, retracts the scalp and elevates the eyebrows
what are the two parts of the orbicularis occuli
orbital part
palpebral part
origin and insertion of orbicularis occuli
O = nasal part of the frontal bone
I = skin around margin of orbit
action of orbicularis occuli
close eyelids gently or tightly
origin and insertion of orbicularis oris
O - buccinator
I - mucous membranes of lips
action of orbicularis oris
close and protrude the lips and assists in whistling
origin and insertion of buccinator
O - posterior part of alveolar process of maxilla and pterygomandibular raphe
I - orbicularis oris
action of buccinator
press cheeks against the molar teeth and smiling
what structure pierces the buccinator
the parotid duct
what lies superficial to the buccinator and is also pierced by the parotid duct
buccal fat pad
origin and insertion of the platysma
O- subcutaneous tissue of infra and supraclavicular regions
I - base of mandible and merges with some facial muscles
action of platysma
tense skin of inferior face/ neck and depress the mandible
what is the action of the levator labii superioris alaeque nasi
flares nostrils and elevates upper lips
what are the two parts of the nasalis
transverse
alar
what is the action of the nasalis
wrinkles skin over the dorsum of the nose
what are the key arterial supplies to the face
facial
maxillary
transverse facial (superficial temporal)
what is the venous drainage of the face
transverse facial vein drains some of upper face
facial vein drains most of face
what veins join together to create the retromandibular vein
superficial temporal and maxillary
what is the danger triangle of the face
the veins deep to danger triangle drain to cavernous sinus - skin infections in this area may spread as intracranial infections
where do the retromandibular and facial veins drain into
external jugular vein
what are the arterial supplies from the ICA
zygomaticofacial
zygomaticotemporal
supraorbital
supratrochlear
they accompany the nerves
