muscles of facial expression

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include muscles located around the ears scalp neck eyes nose and mouth

muscles of facial expression

all of the muscle of facial expression are inervated by the

VII cranial nerve

the ear muscles

anterior auricular muscle, superior auricular muscle, and posterior auricular.

arises from the connective tissue of the scalp in front of the ear and runs posteriorly into the anterior part of the ear.

anterior auricular muscle

the action of this muscle pulls the ear slightly foward

anterior auricular muscle

arises from connective tissue of the scalp above the ear and the fibers run down and insert into the upper part of the ear

superior auricular muscle

the action of this muscle rises the ear

superior auricular muscle

arises from the superior nuchal line of the occipital bone and the mastoid area

posterior auricular muscle

the fibers of the posterior auricular muscle run forward to insert into

the posterior part of the ear

the action of this muscle pulls the ear back. probably the best developed of the ear muscles.

posterior auricular muscle

muscles of the scalp allow for its mobility both forward and backward

Occipitofrontalis (Epicranius)

is a paired muscle with groups of fibers in front and back connected by a broad flat band of fascia

Occipitofrontalis (Epicranius)

The anterior and posterior groups of Occipitofrontalis muscle fibers take their origin from

connective tissue of the scalp

The foward movement of this muscle results in a frown or squint, and the backward movement raises the forehead skin as in suprise.

Occipitofrontalis (Epicranius)

Muscle of the neck

Platysma

The upper end of the fibers attaches to the inferior border of the mandible, near the angles of the mouth and the skin of the face in that area. They pass down in a broad flat sheet of the face in that area.

Platysma

The muscle lies just below the skin of the neck; thus it moves the skin over the neck quite noticebly when it contracts, pulling the corners of the mouth down or the skin of the upper pectoral region up.

Platysma

Muscles of the eyes close the eyes and move the eyebrows

Orbicularis Oculi, Corrugator, Procerus

The term orbicularis relates to the word _______

circular

Circles the eye

orbicularis

Two parts of the orbicularis oculi

palpebral part, orbital part

The part of the Orbicularis Cculi that encircles the eye

orbital part

attaches to the skull at the medial and later edges of the orbit

orbital part

The muscle fibers of the eyelid comprise the

palpebral part

their fibers also attach at the medial and lateral corners of the orbit.

palpebral part of the orbicularis oculi

the action of this muscle closes the eyelids and contracts the skin around the eye

Orbicularis oculi

the origin at the back of the orbit and inserts into the upper eyelid

levator palpebrae superioris

this muscle raises the eyelid

levator palpebrae superioris

the levator palpebrae muscle is supplied by which nerve

III cranial nerve (oculomotor nerve)

runs from the bridge of the nose up and lateral to the lateral part of the eyebrow

corrugartor

pulls the eyebrow medially and down as in a frown

corrugartor

from the bridge of the nose the fibers of the ______ extend up into the medial end of the eyebrow.

procerus

they pull the eyebrow at the medial end down as in a frown or as in a squint

procerus

is the muscle that opens and closes the nostrils

nasalis

The nasalis is composed of two parts

dilator naris, compressor naris

pulls down the nostrils causing them to flare or dilate

dilator naris

causes the nostrils to close or compress

compressor naris

influence expression, speech, and aid in mastication

muscles grouped around the mouth

the pressures of these muscles on the teeth helps hold the teeth in alignment if the pressures are normal

muscles of the mouth

abnormal pressures caused by cheek biting, lip biting, and lip compression may cause them

to move out of alignment

muscles of the mouth

orbicularis oris, levator labii superioris, zygomaticus minor, zygomaticus major, levator anguli oris, depressor labii inferioris, depressor anguli oris, mentalis, buccinator, risorius.

circles the oral cavity in the tissues of the lips

orbicularis oris

orbicularis oris has some bony attachment at the _________ at the midline of the chin

anterior nasal spine

the fibers circle the lips like a purse string, and all the muscles surrounding the lips interlace with them

orbicularis oris

the action of this muscle is to close and compress the lips

orbicularis oris

elevates the upper lip

levator labii superioris

the fibers run down to be inserted into the fibers of the obiculais oris of the upper lip, midway between the center of the lip and the corner of the mouth

levator labii superioris

zygomaticus minor

is a small muscle from the area of the zygomatic bone

the fibers run down and foward and insert into the obicularis oris just lateral to the levator labii superioris

zygomaticus minor

raises the upper lip although it is usually a very poorly developed muscle and therefore does not exert great influence in this function

zygomaticus minor

is the larger muscle orginating from the zygomatic bone

zygomaticus major

its orgin is lateral to the zygomaticus minor on the most prominate portion of the cheek and runs down and foward to insert into orbiclaris oris at the angle of the mouth

zygomaticus major

its action is to elevate the corners of the mouth as in a smile

zygomaticus major

lies deep to the levator labii superioris, the zygomaticus major. and the zygomaticus minor

levator anguli qris

originates from the maxilla just below the infraorbital foramen

levator anguli oris

the fibers run down and laterally to blend into the orbicularis oris at the corners of the mouth

levator anguli oris

this muscle pulls the angles of the mouth up and toward the midline

levator anguli oris

the orgin of the _______ is the area beneath the angles of the mouth and just above the inferior border of the mandible

depressor labii inferioris

the fibers run up and medially to insert into the fibers of the obicularis oris toward the middle of the lower lip

depressor labii inferioris

this muscle pulls the lower lip down to a pout

depressior labii inferioris

The origin of the ________ is from the same general area as that of the depressor labii inferioris, and the fibers of the former partly overlap the latter.

depressior anguli oris

from the orgin the fibers run up and converage in a triangular shape to blend into the orbicularis oris at the angle of the mouth

depressor anguli oris

pulls the corners of the mouth down

depressor anguli oris

many of the fibers from this muscle appear to be a continuation of the fibers of the platysma

depressor anguli oris

originates on the anterior surface of the mandible just beneath the lateral incisors

mentalis

the fibers run down and toward the midline, where some even cross to meet the muscle on the opposite side, terminating the insertion into the skin of the chin

mentalis

when this muscle contracts it pulls this skin up

mentalis

although it is a muscle of facial expression it plays a role in mastication

buccinator

this muscle originates from a fibrous band (the pterygomandibular raphe)

buccinator

runs from the pterygoid hamulus on the inferior portion of the medial pterygoid plate down the medial surface of the mandible near the posterior part of the mylohyoid line

pterygomandibular raphe

the pterygomandibular raphe connects to the anterior part of the ____________ of the pharynx with the posterior part of the buccinator

superior constrictor muscle

also originates from the buccal alveolar bone of the mandibular molars and from the corresponding area of the mandibular molars

buccinator

from these two bony origins and from the pterygomandibular raphe, the fibers of the buccinator run _______, making the musculature of the cheek

anteriorly

the fibers insert into the obicularis oris at the corners of the mouth

buccinator

when the muscle contracts it pulls the corners of the mouth back and compresses the cheek

buccinator

the buccinator is frequently referred to as an ____________ because of the help it provides in chewing food

accessory muscle of mastication

a person with paralysis of the facia chewing food muscle _________ would have difficulty

bells palsy or stroke

is a small muscle that arises from the soft tissue near the angle of the mandible

risorius

it runs forward on the surface of the buccinator and inserts into the corner of the mouth

risorius

it aid in smiling but is usually very poorly developed

risorius

it also has an apparent continuation of the posterior fibers of the platysma muscle

risorius

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