3.4 Muscles of Facial Expression Flashcards
Raises eyebrows and wrinkles forehead
frontalis m.
retracts scalp
occipitals m.
Closes eyelids
orbicularis oculi
Pulls eyebrows medially and inferiorly; creates horizontal wrinkle across bridge of nose
procerus
Pulls eyebrows medially; creases multiple vertical wrinkles along medial aspects of supra-orbital margin
Corrugator supercilli m.
Flares nostrils
nasalis m.
closes mouth, compresses lips against teeth and produces protrusion of kips (kissing)
orbicularis oris
elevates corner of the mouth (bilaterally = smiling, unilaterally = sneering); dilates mouth
zygomaticus major
Dilates mouth and raises upper lip
zygomaticus minor
dilates mouth and lifts the angle of the mouth
levator anguli oris
retracts (elevate) upper lip; dilates mouth
levator labii superioris
Pulls angles of mouth inferiorly
depressor angel oris
depresses lower lip
depressor labi inferioris
Elevates and protrudes lower lip (pouting)
mentalis
What is the origin of the buccinator muscle?
pterygomandibular raphe
Presses check against teeth (keeps food between occlusal surfaces of teeth), resists forces when blowing, whistling, or sucking
buccinator
depresses mandible (against resistance), tenses skin over neck and lower face
platysma
What gives sensory innervation to the face and scalp?
- Cervical Plexus
- CN V
What gives motor innervation to the face and scalp?
CN VII
What gives sensory innervation to the skin over parotid region, and parotid sheath?
Great auricular n. (branches from cervical plexus)
What gives sensory innervation to the scalp posterior to auricle?
Lesser occipital n. (branches from the cervical plexus)
What gives sensory innervation to the post. ramus of C2, and the scalp over the occipital region?
Greater occipital n. (branch of the cervical plexus)
What gives sensory innervation to the lateral forehead?
Supra-orbital n.
- Branches from CN V1, off of frontal n. in orbit
What gives sensory innervation to the medial forehead?
Supratrochlear n.
- Branches from CN V1, off of frontal n. in orbit
What supplies sensory innervation to:
- Skin over medial cheek
- Lateral nose
- Upper lip
- Inferior eyelid
Infra-orbital n.
- Branches from CN V2, through infra-orbital foramen
What supplies sensory innervation to the skin over the prominence of the cheek?
Zygomaticofacial n.
- Branch of CN V2, off of the zygomatic n.
What supplies sensory innervation to the skin anterior to temporal fossa?
Zygomaticotemporal n.
- Branch of CN V2, from zygomatic n.
What supplies sensory innervation to the skin anterior to auricle and posterior 2/3 of temporal region?
Auriculotemporal n.
- Branch from CN V3
- Travels posterior to neck of mandible to then emerge and travel with superficial temporal vessels
What supplies sensory innervation to the skin and oral mucosa of cheek, and buccal gingiva of mandibular molars?
(Long) buccal n.
- Branch of CN V3
What supplies sensory innervation to the skin and oral mucosa of lower lip?
Mental n.
- Branch of CN V3
- Emerges via mental foramen
Where does CN VII emerge from and what are the fibers?
Stylomastoid foramen
Somatic motor and somatic sensory fibers only
What does CN VII pass through and break up into its 5 terminal branches?
Parotid Gland
What structures travel within the Parotid Gland?
- CN VII does not innervate it
- External Carotid Artery
- Retromandibular Vein
The parotid duct exits anterior aspect of the gland … to the zygomatic arch?
inferior
The parotid duct passes superficial to the …
masseter muscle
What muscle does the parotid duct pierce?
buccinator
Where does the parotid duct open?
opposite 2nd maxillary molar
What gives parasympathetic innervation to the parotid gland?
CN IX - lesser petrosal n.
Where do the preganglionic parasympathetic fibers of the lesser petrosal n. (CN IX) synapse?
Otic Ganglion
The postganglionic fibers of the lesser petrosal n. (CN IX) hitch a ride on what nerve?
Auriculotemporal n. (CN V3)
The post-ganglionic sympatic fibers that innervate the Parotid Gland travel as a plexus on branches of …
ECA
What gives innervation to the parotid sheath?
Great auricular n.
