Week 3 Flashcards
What cranial nerve supply all muscles of facial expression
facial nerve (CN7)
what does the fact that all muscles of facial expression are suppllied by the facial nerve tell us about the muscles
they have formed from the 2nd pharyngeal arch of the embryo
what is the muscle that wrinkles your forehead and raises your eyebrow called
frontalis
what is the tendon that attaches to the frontalis muscle called
epicranial aponeurosis
what is the muscle that surrounds the orbit called
obicularis oculi
what are the 2 parts of the obicularis oculi muscle
- palpebral part
- orbital part
where is the palpebral part of the obicularis oculi muscle and what does it allow you to do
inside eyelides, deep to skin
- blink
where is the orbital part of the obicularis oculi muscle and what does it allow you to do
Further out from palpebral part are courser bundles of skeletal muscle like elipses passing round the eye more over the bone, beyond the area of the eyelids, they intersect of the lateral side.
- Allow to close eyes tightly
what is the attachment for both parts of obicularis oculi muscle called
medial palpebral ligament
what muscle draws the ends of the eyebrows together giving the impression of concentration
procerus muscle
what is the muscl called which surrounds the lips
obicularis oris
what does the obicularis oris do
important for keeping liips sealed when e.g. drinking
what muscle pulls the upper lip up
where does it come from
- levator labii superioris
- from the bone just above the mouth into the whole upper lip
what muscle pulls the lower lip down
- depressor labii inferioris
- coming up from the dermis on chin and coming into the whole lower lip from below
what muscle runs from the orbit to the corner of the mouth
levator anguli oris
what muscle runs from the side of the chin to the corner of the mouth
depressor anguli oris
what muscles run from the zygomatic bone downwards and medially to the corner of the mouth
zygomatic major and minor muscles
what muscle pulls the corner of the mouth out to the side
risorius muscle
what does the levator labii superioris alaeque nasi muscle do
elevator of the upper lip and also of the nose. Little muscle not far from orbit comes down to the upper lip and sends branch out to the side of the nose so it raises the side of the nose
what is the role of the platysma muscle
to maintain the tissues of the neck and stop them sagging down
where is the buccinator
deep to the cheek, comes from back part of the cheek and runs forwards into the lips
what is the role of the buccinator
- gives tone to cheeks
- when eating pushes food in between your teeth and stops food building up in the vestibule of the mouth
- important for controlling dentures
where is the zygomatic arch
lateral to the eye, TMJ, head of the mandible
what does the parotid salivary gland cover
- comes up to the level with head of the mandible
- covers the masseter
- comes over upper part of sternocleidomastoid muscle
why is swelling of the parotid gland sore
covered by dense fascia which doesn’t really expand
what does the masseter do
raises mandible up
clenches teeth together
where is the parotid duct
- runs across masseter from parotid salivary gland
- opens up to crown at the 2nd molar tooth
- accessory parotid gland is on its edge
where are the parotid lymph nodes
on surface or embedded in parotid gland
what artery supplies blood to the side of the head and is the final branch of the external carotid artery
superficial temporal artery
where is the superficial temporal vein
right behind the superficial temporal artery (side of the head)
what is the course of the facial nerve
- comes out from base of the skull just behind the ear
- runs forward
- goes into the parotid salivary gland
- runs in gland in a parasagital (front to back) direction
- branches inside the parotid gland
when people talk about superficial and deep parts of the parotid gland what are they referring to
superficial or deep to the plane in which the facial nerve is branching
what are the 5 branches of the facial nerve
- temporal
- zygomatic
- buccal branches
- marginal mandibular
- cervical
what does the temporal branch of the facial nerve supply
upper part of obicularis oculi and frontalis muscle
what does the zygomatic branch of the facial nerve supply
obicularis oculi
what do the several buccal branches of the facial nerve supply
supply the muscles going into the upper lip
what does the marginal mandibular branch of facial nerve supply
muscles of the lower lip
what does the cervical branch of the facial nerve supply
platysma
are the branches of the facial nerve single branches or groups of branches
groups of branches
where is the supraorbital nerve derived from
opthalmic branch of trigeminal nerve
