Facial Mastication muscles
Temporalis
-Action: elevates and retracts mandible (closes jaw). -Attachments: Lateral cranium and coronoid process of mandible
Frontalis
-Function: Raises eyebrows -Attachments: frontal bone and epicranial aponeurosis
Buccinator
-Function: tightens the cheeks. -Although the buccinator is a muscle of facial expression, it plays an important role in mastication. It holds food within the teeth during chewing. -Attachments: Mandible/maxilla and within the skin of face
A patient has difficulty abducting the jaw. What muscle is affected?
Lateral pterygoid
The transverse nasalis muscle
compresses the nostrils
corrugated supercilii
pulls eyebrows inferiorly and medially, creates vertical wrinkles above nose
Medial and Lateral Pterygoids
-Action: Elevates and protracts mandible; side to side grinding -Attachments: Sphenoid and mandible. -Both pterygoid muscles are deep to masseter. The lateral pterygoid is superficial to the medial pterygoid.
Zygomaticus major
-Action: Elevates corners of the mouth "Smile" muscle -Attachments: zygomatic bone and skin of mouth
Depressor anguli oris
-Action: Depresses the corners of the mouth "Frown" muscle -Attachments: mandible and skin of mouth
Masseter
-Action: elevate and protracts mandible (close jaw). -Strongest of the muscles of mastication -Attachments: Zygomatic arch and mandible.
The buccinator
-an oral muscle important for facial expression. -It aids with mastication and forces food between the teeth with the help of the tongue, preventing the pocketing of food into the cheek.
Orbicularis oculi
-circular muscle around the eye -Closes eyelids -attaches to the skin around the eyes and within the skin of the face.
orbicularis oris
-circular muscle around the mouth -Puckers/closes lips -attaches to the skin around the mouth and within the skin of the face.
orbicularis oculi
-circular muscle group surrounding the eye -consists of three parts: --Palpebral orbicularis --lacrimal orbicularis --orbital orbicularis
Muscles of mastication
-masseter, -temporalis, -medial pterygoid, -lateral pterygoid
The nasal muscles
-nasalis transverse -nasalis alar -depressor nasi septi -procerus
The lateral pterygoid
-operates the temporomandibular joint and facilitates lateral movement of the jaw. -abducts the jaw.
muscles of facial expression
-orbicularis oris -orbicularis oculi -zygomaticus major -depressor anguli oris -frontalis -buccinator
A muscle innervated by cranial nerve VII crosses the angle of the mouth to the upper lip and inserts into the skin near the median line. What is a function of this muscle?
Emphasizes vocal communication -This muscle is the triangularis, a facial muscle that composes a part of the orbicularis oris.
A patient's procerus muscle has been damaged. What action will be affected?
Flaring the nostrils
A muscle innervated by cranial nerve VII originates from the maxilla and mandible and inserts into the orbicularis oris muscle. How does this muscle assist in mastication?
Prevents food pocketing into cheek
facial muscles that adduct the jaw
The masseter, medial pterygoid, and temporalis
four classical muscles of mastication that move the jaw laterally.
The masseter, medial pterygoid, temporalis, and lateral pterygoid
insertions of facial muscles
The muscles of facial expression insert into the skin, and the muscles of mastication insert onto the mandible.
The procerus
a nasal facial muscle that pulls the glabellar skin downward to flare the nostrils.
The depressor septi
a nasal facial muscle that pulls the tip of the nose downward and constricts the aperture of the nose.
Opening of the jaw
accomplished by the lateral pterygoid.
Closing of the jaw
accomplished by the masseter, temporalis, and medial pterygoid.
Movement of the mouth and lips
accomplished in part by the buccinator, but this movement adds emphasis to vocal communication rather than assisting in mastication.
The corrugator supercilii
an ocular facial muscle that moves the eyebrows and glabella.
The nasalis muscle
the largest nasal facial muscle with two parts: alar and transverse.
