Face and Parotid Region Flashcards
Epicranial muscle
Occipitofrontalis muscle
Circumorbital/palpebral muscles
Orbicularis occuli and corrugaor supercilli muscle
Nasal muscles
Procerus, nasalis, depressor septi nasi
Buccolabial muscles
Zygomaticus major, zygomaticus minor, levator labii superioris alaeque nasi, levator labi superioris, levator anguli oris, risorius, depressors anguli oris, depressor labii inferioris, mentalis
Depressors, retractors and everters of lower lip
Depressor anguli oris, depressor labii inferioris, mentalis
Elevators, retractors, and reverters of upper lip
Zygomaticus major, zygomaticus minor, levator labii superioris alaeque nasi, levator labi superioris, levator anguli oris, risorius,
Action of frontalis muscle
elevates eyebrows and wrinkles forehead
Action of occipitals
retracts scalp
Action of orbicular oculi
closes eyelids, both voluntary and blink reflex
Action of corrugater superrich
draws eyebrows downwards and medially
Action of procerus
draws eyebrows downward
Action of nasalis
draws ala of nose toward septum
Action of depressor septi nasi
constricts nares
Action of zygomaticus major
draws angle of mouth upward and backward
Action of zygomaticus minor
elevates upper lip/smile
Action of levator labii superioris ileaque nasi
elevates ala of nose and upper lip
Action of levator labii superioris
elevates upper lip; dilates nares in disgust
Action of levator anguli oris
elevates angle of mouth medially in disgust
Action of risorius
retracts angle of mouth (Fake smile)
Action of depressor anguli oris
depresses angle of mouth in a frown
Action of depressor labii inferioris
depresses lower lip in a snarl
Action of mentalis
elevates and protrudes the lower lip like when pouting
Action of orbicularis oris muscle
closes lips
Action of buccinator
Presses cheek to keep it taut while whistling and chewing
Action of platysma muscle
Tenses skin over neck and lower face
Where does CN VII emerge from the temporal bone?
Stylomastoid foramen
What somatic motor branches does Facial give off as soon as it exits stylomastoid foramen?
branches to stylohyoid, stapedius, posterior auricular, occipitalis, and posterior belly of digastric
5 terminal branches of CN VII
Temporal, zygomatic, buccal, marginal mandibular, cervical
What supplies sensory innervation to the face?
V1, V2, and V3 of trigeminal and branches of the cervical plexus from C1-C4.
Sensory branches of cervical plexus
great auricular nerve, lesser occipital nerve, greater occipital nerve
What does great auricular nerve innervate?
Sensory to skin of most of the parotid region and the parotid fascia surrounding the parotid gland
What does the lesser occipital nerve innervate?
Sensory to skin posterior to auricle
What does greater occipital nerve innervate?
sensory to scalp over occipital region
Branches of ophthalmic division of trigeminal
Supraorbital nerve, supratrochlear nerve, infratrochlear nerve, external nasal nerve
What does supraorbital nerve innervate
skin of the middle of the superior eyelid and skin of the lateral forehead and scalp. It emerges from the supraorbital foramen.
What does the supratrochlear nerve innervate?
supplies the skin of the medial portion of the superior eyelid and medial forehead
Branches of maxillary division of trigeminal
Infraorbital nerve, zygomaticofacial nerve, zygomaticotemporal nerve
What does infraorbital nerve innervate
skin of the cheek, lateral nose, skin and oral mucosa of the lips
What does the zygomaticofacial nerve innervate
skin on the prominence of the cheek
What does the zygomaticotemporal nerve innervate
skin anterior to the temporal fossa
Branches of the mandibular division of trigeminal
Auriculotemporal nerve, long buccal nerve, and mental nerve
What does the auriculotemporal nerve innervate
skin anterior to the auricle and posterior 2/3 of the temporal region
What does the long buccal nerve innervate
skin and oral mucosa of cheek and buccal gingiva of mandibular molars
What does the mental nerve innervate
supplies skin of chin and skin and oral mucosa of the lower lip.
superficial facial branches of facial artery
Inferior labial artery, superior labial artery, lateral nasal artery, angular artery
What does the facial artery arise from
The external carotid artery
What is the dangerous thing about the veins of the face?
They are valveless
What veins drain to form the facial vein?
Angular, nasal and labial veins
What forms the retromandibular veins
The union of the superficial temporal vein and maxillary vein
Branches of retromandibular vein
anterior-receives the facial vein
posterior-joins the posterior auricular vein forming the external jugular which goes to subclavian.
Sensory innervation of the parotid gland
great auricular nerve from the cervical plexus
Parasympathetic innervation of the parotid gland
CN IX via the lesser petrosal nerve carries preganglionic sympathetic fibers that synapse in the otic ganglion. The postganglionic fibers hitch a ride on the auriculotemporal nerve
Sympathetic innervation of the parotid gland
postganglionic sympathetics from the superior cervical ganglion travel to the parotid gland via the carotid plexus by branches of the external carotid artery
5 layers of scalp
Skin Connective tissue Aponeurosis Loose areolar tissue Pericranium
Aponeurosis of scalp
serves as attachment for frontal, occipitalis, and temporalis
Loose areolar tissue of scalp
allows movement of the first three layers of the scalp over the underlying calvaria.
Emissary veins
connect the dural venous sinuses with the veins outside the cranium via the transverse foramina within the substance of the body cranium. Since blood flow is usually towards the brain, this can be a route fro spread of infection from extra cranial to intracranial venous structures.
What is the danger area of the face?
Area drained by the facial vein that may allow spread of infection to the cavernous sinus via ophthalmic veins and or to the pterygoid venous plexus via deep facial veins
What is the danger area of the scalp
Loose connective tissue because blood and pus can spread easily within it.
Can infection spread from loose connective tissue to the neck?
No due to the attachments of occipitals muscle to the occipital bone and to mastoid portions of temporal bones
Can infection spread from loose connective tissue laterally?
No because of the epicranial aponeurosis being continuous with the temporal fascia at the superior temporal line.
Can infection from the scalp spread to the eyelids and root of the nose?
yes because there is not attachment of the frontalis muscle to the bone.
Insertion of occipitofrontalis
epicranial aponeurosis
origin of frontalis muscle
upper orbital margin
origin of occipitalis
superior nuchal line
Insertion of orbital portion of orbicularis oculi
skin around margin of orbit
Origin of orbital portion of orbicularis oculi
medial orbital portion of frontal bone
Origin of palpebral portion of O.O. muscle
lacrimal bone
Insertion of palpebral portion of O.O. muscle
superior and inferior tarsal plates.
Origin of corrugator superricilli
medial supraorbital margin
Insertion of corrugator supercilli
epicranial aponeurosis
origin of procerus
nasal bone and cartilage
Origin of nasalis
nasal bone and cartilage
origin of depressor septi nasi
incisive fossa of maxilla
Origin of zygomaticus major and minor
zygomatic arch
Insertion of zygomaticus major and minor
angle of mouth
Origin of levator labii superioris
maxilla above infraorbital foramen
Insertion of levator labii superioris
skin of upper lip
Origin of buccinator muscle***
alveolar process of maxilla, mandible, pterygomandibular raphe