Face Flashcards
What muscle helps you close your eyes? (blink, etc)
Which helps with chewing/push food back over from cheek?
orbicularis oculi muscle
buccinator
What are the motor innervation of muscles of facial expression?
What is the sensory innervation of face?
motor- facial nerve (CN VII)
sensory- trigeminal nerve (Cranial Nerve V)
Where does the facial nerve (CN VII) exit the skull?
exits via stylomastoid foramen, pierces the parotid gland, as it passes through divides into 5 major branches
What are the 5 major branches that the facial nerve (CN VII) divides into as it exits the skull (from superior to inferior)?
(Ten Zebras Bashed My Car) Temporal Zygomatic Buccal Marginal/Mandibular Cervical
What happens if the facial nerve (CN VII) is injured just after it exits the stylomastoid foramen?
Bell’s Palsy. smoothing of forehead, eyebrow drop, drooping corner of mouth, can’t blink, drool
What are the three divisions of the Trigeminal nerve (CN V)?
ophthalmic division (just sensory) CN V1 maxillary division (just sensory) CN V2 mandibular division (motor and sensory) CN V3
anterior and posterior divisions… anterior is primarily motor and posterior primarily sensory.
Describe the nerves the ophthalmic division (CN V1) of the Trigeminal nerve (CN V) includes.
supraorbital supratrochlear infratrochlear external nasal lacrimal (LASSIE) (just sensory)
Describe the nerves the maxillary division (CN V2) of the Trigeminal nerve (CN V) includes.
zygomaticotemporal
zygomaticofacial
infraorbital
(Just sensory)
Describe the nerves the mandibular division (CN V3) of the Trigeminal nerve (CN V) includes.
auriculotemporal
buccal
mental
(sensory and motor)
What innervates the parotid gland?
parasympathetic fibers from the glossopharyngeal nerve (IX) which synapse in the otic ganglion (behind V3 as it exits foramen ovale) and then travel in the auriculotemporal nerve as it passes through the parotid gland.
What does the parotid gland secrete? Through what?
serous fluid via Stenson’s duct, which pierces buccinator muscle and enters the oral cavity adjacent to the upper 2nd molar. lays on masseter
What is the “Danger Triangle”?
if infection occurs in upper face, potentially bacteria can migrate from this region via the deep facial vein into the cranium.
Facial vein infection then can spread by its interconnections (ophthalmic and infraorbital veins) to the pterygoid plexus and into the cavernous sinus and thus reach brain causing meningitus or encephalitis
What are the layers of the scalp?
S-skin C-connective tissue (dense) A-aponeurosis L-loose connective tissue P-pericranium
What is immediately deep to scalp?
Cranial meniges:
dura mater, arachnoid mater, subarachnoid space (filled with CSF), pia mater
What is periorbital ecchymosis?
blood draining down from laceration on scalp, pool around forehead…black eyes resulting accumulation of blood from scalp