Muscles of Facial Expression Flashcards
the two functions of muscles within the scull
- mastication- chewing
2. facial expression
Facial expression muscle inervation
Cranial Nerve 7
-facial nerve
Facial Muscles attach to:
- skin
- fascia
- bone
Occipitofrontalis -two bellied muscle
- tendon in the middle
- tendon-thin, sits on top of scull
- fontalis
- occipitalsis
the tendon on the top of the head conecting the two bellies of the occipitofontalis, covering the supirior and lateral surfaces of the skull is called the:
- epicranial aponeurosis (collective term of muscle-above the cranium)
- galea aponeurotica (name of the tendon)
- apnoneurosis is a sheet like tenson
Frontal Belly (frontalis) cause what movement?
- furrow eyebrows
- look serious
Occipital Belly (occipitalis) causes what movenent?
- raising eyebrows
- surprise muscle
Orbicularious Oculi- round, of the eye is refered to as what?
- blinking muscle
- contraction cloese the eye lids
Orbicularious Oculi where does it originate?
-the entire eye orbit
Orbicularious Oculi where does it insert?
onto the eye lids
what type of muscle is the Orbicularious Oculi?
sphincter muscle- closes an orifices
Zygomatic Major and Minor - stems othe zygomatic
insert where?
- the corner of the lips
Zygomatic Major and Minor are called what?
the smiling muscles
Risorius (laughing) none as the _____
whistling muscle
Orbicularis oris circular sphincter muscle, around the mouth
known as?
- the kissing muscle
- purges lips, closes the mouth
Risorius does what?
draws the corners of the mouth together, bring the cheeks towards the teeth (liek while whistling)
Risorius originates off of?
-Fascia over parotid (salivary) gland
Depressor anguli oris (depresses or lowers, angle or corner, of the mouth)
originates from where?
-mandible
Depressor anguli oris incerts where?
the coner of the mouth
Depressor anguli oris is refered to as…
the frowning muscle
-sad
Platysma runs from where?
the mandible
Platysma inserts on what?
pectoralis major muscles (chest muscle)
Platysma is known as the?
shaving muscle
Buccinator (buckle region- in the cheek)
-shares compartments (more important in chewing) but shares inervation with the facial muscle
allows for what movement?
-side to side motion of the mouth
Buccinator orgin?
- just below the teeth
- just above the teeth
Buccinator insertion?
-just above the mouth
what is different about muscle attachment of facial expression muscle than other skelatal muscles?
facial muscles attach primarily to skin rather than bone
Which is your “kissing” muscle? (You contract it to pucker your lips.)
orbicularis oris
Which muscle do you use the most when smiling?
zygomaticus major
Buccinator paired muscle, what does the contraction of one side do?
moves the jaw back and forth
where does cranial nerve 7 exit the cranial cavity?
the inernal acoustic mutes
where does the internal acoustic metus lead into?
the auditory canal, passage way through the temporal bone
which passage in the audiotory canal does the facial nerve take to reach the outside of the skull?
stylomastoid foramen
-lies between the styloid process and the mastoid process
once outside the stylomastoid forman the facial nerve is covered by what gland?
the parotid (salivary) gland
- just antior to the ear
- salivary gland that secreats jucies into the oral cavity
- starts chemical digestion
- facial nerve runs through and out of the gland
how does the single cranial nerve inervate all the facial muscles?
-branches into 5 branches that spread across the face
what happens when the parotid (salivary) gland becomes swollen? Bell’s Palsy
- its duct extends into the oral cavity, and we can take in alot of bacteria when we eat
- often only one will be infected at a time
- when infected the gland swells and puts pressure on the facial nerve that exists within the gland
- waking up in the morning with a droopy side of the face
- this is b/c they have taken on an infection and is puting pressure on the facial nerve and by doing so has inhibted it’s function, its ability to inervate the muscles of facial expression on one side of the face.
- too much pressur can hinder the finction of that nerve in the long term
