Muscles of Mastication and Facial Expression Flashcards
What muscle is this?
What is its origin?
What is its insertion?
masseter (deep & superficial heads)
Origin: zygomatic process of maxilla and zygmatic arch (S); zygomatic arch (D)
Insertion: ramus of mandible
What muscle is this?
What is its origin?
What is its insertion?
temporalis
Origin: temporal fossa on lateral surface of skull
Insertion: coronoid process of mandible; anterior border of ramus
What muscle is this?
What is its origin?
What is its insertion?
superior lateral pterygoid
Origin: greater wing of sphenoid; lateral pterygoid plate
Insertion: condyle of mandible; capsule of TMJ
What muscle is this?
What is its origin?
What is its insertion?
inferior lateral pterygoid
Origin: lateral pterygoid plate
Insertion: neck of condyle on mandible
What muscle is this?
What is its origin?
What is its insertion?
medial pterygoid
Origin: pterygoid fossa; medial surface of lateral pterygoid plate
Insertion: angle of the mandible on medial surface
What two muscles make up the “masseter sling?”
masseter and medial pterygoid
Which two muscles are depressors of the palate?
palatoglossus
palatopharyngeal
Which muscles are elevators of the palate?
tensor veli palatini
levator veli palatini
musculus uvulae
These muscles depress the palate and have NO origins or insertions to bone.
palatoglossus
palatopharyngeal
What are the 4 muscles of mastication?
masseter
temporalis
inferior and superior lateral pterygoids
medial pterygoid
What muscle is this?
What is its origin?
What is its insertion?
buccinator
Origin: alveolar processes of maxillary and mandibular molars; pterygomandibular raphe
Insertion: orbicularis oris
What muscle attaches to the posterior border of the pterygomandibular raphe? The anterior border?
superior constrictor
buccinator
Where does the pterygomandibular raphe attach to?
hamulus of medial pterygoid plate
mylohyoid line of mandible
What muscle is this?
What is its origin?
What is its insertion?
superior constrictor
Origin: medial pterygoid plate; hamulus
Insertion: pterygomandibular raphe; alveolar processes
What muscles make up the suprahyoids?
geniohyoid
mylohyoid
digastric
stylohyoid
What muscle is this?
What is its origin?
What is its insertion?
geniohyoid
Origin: inferior genial tubercule
Insertion: anterior surface of hyoid bone
What muscle is this?
What is its origin?
What is its insertion?
mylohyoid
Origin: last molar root to the mylohyoid line
Insertion: median raphe under tongue; body of hyoid
What muscle is this?
What is its origin?
What is its insertion?
digastric (anterior and posterior bellies)
Origin: lower border of mandible (anterior); mastoid process (posterior)
Insertion: hyoid bone
What muscle is this?
What is its origin?
What is its insertion?
stylohyoid
Origin: styloid process
Insertion: body of the hyoid
What muscle is this?
What is its origin?
What is its insertion?
genioglossus
Origin: inferior mental spine of mandible (genial tubercule)
Insertion: hyoid and tongue
Which structure contains the insertions of 8 facial muscles?
modiolus
Which cranial nerve innervates all facial muscles?
CN VII (7)
What muscle is this?
What is its origin?
What is its insertion?
orbicularis oris
Origin: fibers of other facial muscles
Insertion: feathers from the angle of mouth into the surrounding skin
What muscle is this?
What is its origin?
What is its insertion?
zygomaticus major
Origin: zygomatic bone
Insertion: modiolus (orbicularis oris, depressor and levator anguli oris)
What muscle is this?
What is its origin?
What is its insertion?
zygomaticus minor
Origin: zygomatic bone
Insertion: subcutaneous tissue of upper lip
What muscle is this?
What is its origin?
What is its insertion?
risorius
Origin: fascia of the masseter
Insertion: modiolus (skin surrounding the mouth)
What muscle is this?
What is its origin?
What is its insertion?
levator labii superioris alaeque nasi
Origin: frontal process of the maxilla
Insertion: alar cartilage; levator labii superioris
What muscle is this?
What is its origin?
What is its insertion?
levator labii superioris
Origin: zygomatic bone
Insertion: skin of upper lip
What muscle is this?
What is its origin?
What is its insertion?
depressor anguli oris
Origin: oblique line of the mandible
Insertion: risorius; orbicularis oris
What muscle is this?
What is its origin?
What is its insertion?
depressor labii inferioris
Origin: oblique line of mandible, between genial tubercule and mental foramen
Insertion: skin of lower lip
What muscle is this?
What is its origin?
What is its insertion?
mentalis
Origin: incisive fossa of the mandible
Insertion: soft tissue of lower lip and chin
Contraction of the inferior lateral pterygoids and digastric muscle and relaxation of the masster, medial pterygoids and temporalis _____ the mandible.
depress
Which muscles contract to depress the mandible?
inferior lateral pterygoids
digastric
Which muscles relax to depress the mandible?
masseter
medial pterygoids
temporalis
Contraction of the masseter, medial pterygoids, temporalis and superior lateral pterygoids and the relaxation of the inferior lateral pterygoids and digastric muscle _____ the mandible.
elevate
The contraction of which muscles elevate the mandible?
masseter
medial pterygoid
temporalis
superior lateral pterygoid
The relaxation of which muscles elevate the mandible?
inferior lateral pterygoid
digastric
The contraction of the left inferior lateral pterygoid and relaxation of right inferior lateral pterygoid results in which direction of lateral movement?
right lateral movement
The contraction of which muscles protrude the mandible?
inferior lateral pterygoid
masseter
medial pterygoid
The contraction of which muscle causes retrusion of the mandible?
temporalis
