Exam 3: Skull lecture iii Flashcards
orbicularis oris: origin
from maxilla and mandible
orbicularis oris: insertion
to mucous membrane of lips
orbicularis oris: action
closes oral fissure (space btwn lips) and aids in puckering lips
orbicularis ori: innervation
facial nerve
buccinator: origin
from mandible, maxilla, and pterygomandibular raphe
buccinator: insertion
to angle of mouth
buccinator: action
compresses cheeks during blowing and puckering (press cheeks against molar teeth) and help keep food in place during chewing
zygomaticus major: origin
from zygomatic arch
zygomaticus major: insertion
to angle of mouth
zygomaticus major: action
elevate labial commissure (jxn of upper and lower lips); bilateral contraction causes smile; unilateral contraction causes sneer
muscles of scalp/facial expression are all innervated by:
the facial nerve
levator labii superioris: origin
from maxilla
levator labii superioris: insertion
to skin of upper lip
levator labii superioris: action
elevate upper lip
depressor labii inferioris: origin
From mandible
depressor labii inferioris: insertion
to skin of lower lip
depressor labii inferioris: action
depress lower lip
depressor anguli oris: origin
from mandible
depressor anguli oris: insertion
to angle of mouth
depressor anguli oris: action
depress labial commissure
platysma: origin
from subcutaneous tissue around the clavicle
platysma: insertion
to mandible, skin of cheek, and angle of mouth
platysma: action
depress mandible; tense skin of inferior face and neck
nerves of face and scalp: facial nerve (CN VII): its 5 terminal branches are the _; these supply the muscles of facial expression
temporal, zygomatic, buccal, marginal mandibular, and cervical nerves
bell palsy: results from injury to the
facial nerve or its branches
bell palsy: the nerve injury produces paralysis of some or all _ on the the affected side
facial muscles
bell palsy: symptoms include
distorted facial expression, inadequate lubrication of corena, problems eating and whistling, tears and saliva running from drooping eye and mouth, etc
trigeminal nerve (CN V): its 3 divisions provide most of the _ innervation of the face and _ scalp
cutaneous (sensory); anterior scalp
trigeminal nerve (CN V): CN V is largely _, but also has a _ portion that supplies the chewing/mastication muscles
largely sensory but motor portion
trigeminal nerve (CN V): most of the neurons providing its sensory fibers that enter the CNS have cell bodies in the _
trigeminal ganglion (which is thus a sensory ganglion)
ophthalmic nerve (CN V1): one of the 3 main divisions of the _ nerve
trigeminal nerve
ophthalmic nerve (CN V1): exits cranium via _ fissure
superior orbital fissure
ophthalmic nerve (CN V1): trifurcates into the _, _, and _ nerves
frontal, nasociliary, and lacrimal nerves
ophthalmic nerve (CN V1): mostly supplies skin of scalp and face superior to _ and medial to _
superior to lower eyelid and medial to lateral corner of eye
ophthalmic nerve (CN V1): the ophthalmic nerve also supplies the eyeball, part of the _ and the _ gland
part of the nose and the lacrimal gland
maxillary nerve (CN V2): one of the 3 main divisions of the _ nerve
trigeminal nerve
maxillary nerve (CN V2): exits cranium via _, travels a bit, and enters orbit via _
foramen rotundum; inferior orbital fissure
maxillary nerve (CN V2): gives rise to _ and _ nerves
zygomatic nerve and infra-orbital nerve
maxillary nerve (CN V2): mostly supplies skin from bottom of _ down to _
bottom of upper eyelid down to labial commissure
maxillary nerve (CN V2): the maxillary nerve also supplies skin of a bit of the _ scalp, and most of the _
lateral scalp and most of the upper teeth
mandibular nerve (CN V3): one of the 3 main branches of the _ nerve
trigeminal nerve
mandibular nerve (CN V3): exits the cranium via
foramen ovale
mandibular nerve (CN V3): gives rise to _, _, and _ nerves
auriculotemporal, buccal, and mental nerves
mandibular nerve (CN V3): mostly supplies skin inferior to _ and part of skin of cheek and _
skin inferior to labial commissure and part of skin of cheek and ear
mandibular nerve (CN V3): the mandibular nerve also supplies the _ teeth, and contains _ fibers that supply chewing muscles
lower teeth, motor fibers that supply chewing muscles (masseter, temporalis, medial pterygoid, and lateral pterygoid)
trigeminal nerve (CN V): each division of the trigeminal nerve supplies a distinct _ zone, similar to a dermatome, but w/o the overlapping of _ nerves; therefore, injures result in _ areas of paresthesia
sensory zone, adjacent nerves, distinct and defined areas of paresthesia
trigeminal nerve (CN V): the divisions of CN V supply sensation not only to the superficial skin of the face but also to _ surfaces of the cornea, nasal cavity, oral cavity, paranasal sinuses, etc
deep mucosal surfaces
trigeminal neuralgia (tic douloureux): a sensory disorder of the _
sensory disorder of the sensory portion of CN V
trigeminal neuralgia (tic douloureux): characterized by
sudden attacks of excruciating jabs of facial pain
trigeminal neuralgia (tic douloureux): _ is most frequently involved (think nerve)
CN V2
trigeminal neuralgia (tic douloureux): may be caused by _
demyelination of CN V sensory axons
superficial vasculature of face and scalp: the face is richly supplied w/ _ arteries and veins. the terminal branches of both arteries and veins anastomose freely, including across the _ w/ contralateral partners
superficial arteries and veins; midline
superficial vasculature of face and scalp: external carotid artery: most _ arteries of the face are branches of it; one of these branches, the _ artery, provide the main arterial supply to the face
superficial arteries, facial artery
superficial vasculature of face and scalp: internal carotid artery: gives rise to a couple of _ arteries
forehead
CN V1 =
Ophthalmic nerve
CN V2=
Maxillary nerve
CN V3=
Mandibular nerve
