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81 terms

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