Lecture 3 muscles of facial expression Flashcards
where are the muscles of facial expresion found?
in the superficial fascia
lable the following diagram
what happens at at 90 at muscle fibre direction?
wrinkles
what is the border around the lips called ?
vermillion border
what are the 7 muscles of facial expression?
- frontalis
- orbicularis oculi
- quadratus superioris
- buccinator
- orbicularis oris
- depressions of the lip
- platsyma
name the 4 quadratus superioris muscles ?
- zygomaticus major
- zygomaticus minor
- levator labii superioris
- levatorlabii superioris alaequae nasi
in addtion to lifitin up the lip what else does the lavetor babii superior also do?
it flares the nostrils
name the muscle at the mental
mentalis
how is bells palsey induced in dentistry ?
through anesthsia of the facial nerve
which one of the following is innervated:
dermis
epidermis
dermis
where do the muscles of mastication attache to ?
attach to bone of the deep fascia
what is an important land mark?
the zygomatic bone
what does the frontalis raise?
what is it connected to ?
eyebrows-
the scale
what is the platsyma?
it is the muscle of facial expression located in the neck
what is the function of levator anguli oris and depressor labii inferioris?
helps to smile
pout
what is modiolus compreised of and what is its significance ?
connective tissue where buccinator/ pterygomandibular raphe multiple muslces insert.
what is the layer called between the frontalis muscle and occipitalis muscle.
what does it allow?
apicranial apnoeurosis
it allows movement of the scalp
what does the acrronym scalp stand for ?
- skin
- connective tissue- highly vascularised
- loose connective tissue
- pericranium
how does the facial nerve get to the face?
exits through the internal acoustic meatus leaves through the stylomastoid foramen and passes through the parotid gland which grows around it.
what are the 6 branches of the facial nerve?
- posterior auricular- suppiles the occipitalis muscles
- temporal
- zygomatic
- buccal
- mandibular
- cervical
where does the 7th cranial nerve divide ?
in the partoid gland
how many branches does the carotid artery have and which one is the facial arterty.
it has 4 branches and it is the 4th branch.
- right common caroitud artery
- right external carotid artery
- right internal carotid artery
- facial artery
what are the 2 routes of venous blood drainage ?
- from the superior and inferior ophthalmix veins into the cavernous sinus- surrounding the pitutary gland- into the internal jugular vein
- facial vein into the internal jugular vein
where does pterygoif venous plexus empty into ?
maxillary vein
how are the lymphnodes arranged
- deep lymphatics follow arteries
- superficial lymphatics follow veins
what is the difference between trigeminal nerve and facial nerve
facial nerve innervates teh muscle of facial expression
whereas
muscles of mastication and sensation of the face is done by trigeminal nerve
what are the sensory nerve supply to the face?
- great auricular nerve (C2/C3)- spinal nerves
- Trigeminal nerve (V)- cranial nerve
that are the 3 parts of the trigeminal nerve and what do they innervate ?
- ophthalmic division- orbits/bridge of nose/ forehead
- Maxillary division- maxilla anterior temple
- Mandibular division- mandible and mid temple
lable the diagram- with 12 nerves
how do you test for sensory components of CNV 4 steps
- ask the patient to close their eyes
- brush the skin in each dermatone with cotton wool
- ask patient to tell you when they feel the skin being touched
- compare both sides
