Quiz 4: Skull Flashcards
Where is the Epicranius located?
Top half of the head
What are the two area’s of the Epicranius?
Frontal belly
Occipital belly
What is the origin of the frontal belly?
Skin of eyebrows, root of nose
Where does the frontal belly insert?
Epicardial aponeurosis
What action of the frontal belly perform?
Raises eyebrows
Where does the occipital belly originate?
Occipital and temporal lobes
Where does the occipital belly insert?
Epicranial aponeurosis
What action does the occipital belly perform?
Pulls scalp
What is the origin of orbicularis oculi?
Frontal and maxillary bones
Orbit ligaments
Where does the orbicularis oculi insert?
Eyelid tissue
What action does the orbicularis oculi perform?
Closes eye, blinking, squinting
What is the origin of the zygomaticus major and minor?
Zygomatic bone infraorbital margin of maxilla
Where does the zygomaticus major and minor insert?
Skin of the upper lip
What action does the zygomaticus major and minor perform?
Raises/furrows upper lip
Opens lip
What is the origin of the risorius?
Zygomatic bone
What is the insertion of the risorius?
Skin and muscle at corner of the mouth
What is the action of the risorius?
Draws corners of the lips laterally
What is the origin of the orbicularis oris?
Arises directly from the maxilla and mandible
What is the insertion of the orbicularis oris?
Encircles mouth
What is the action of the obicularis oris?
Closes and protrudes lips
What is the origin of the buccinator?
Deep to masseter
What is the insertion of the buccinator?
molar region of the maxilla and mandible
What is the action of the buccinator?
Maintains tightness of cheeck
What is the origin of the mentalis?
Mandible below incisors
What the the insertion of the mentalis?
skin of chin
What is the action of the mentalis?
Protrudes lower lip, wrinkles chin
What is the origin of the platysma?
fascia covering the clavicle
What is the insertion of the platysma?
Mandible, cheek skin
What is the action of platysma?
Pulls down the mandible opening the mouth
What is the origin of the depresssor labii inferioris?
oblique line at base of jaw
What is the insertion of the depressor labii inferioris?
Skin of lower lip
What is the action of the depressor labii inferioris?
Depresses and elevates the lower lip
What muscle is the prime mover for creating wrinkles in the forehead?
Epicranius
What is the prime mover for blinking your eyes
obicularis oculi
What is the prime mover for puckering your lips?
Risorius
What is the prime mover of smiling?
Zygomaticus major
What synovial joint is the tmj?
Condylar hinge joint
What is the location and articulating surfaces of the TMJ joint?
Connects the mandible to the rest of the skill, condylar process of the mandible
What are the movements associated with the TMJ joint?
Mandibular depression
Elevation
Lateral deviation
What is the origin of the masseter?
zygomatic arch
What is the origin of the temporalis?
temporal fossa
What is the origin of the digastric?
mastoid process of temporal bone
What is the origin of the medial pterygoid?
Pyramidal process of palatine bone, tuberosity of maxilla
What is the origin of the lateral pterygoid?
Lateral surface of sphenoid bone
What is the insertion of the masseter?
angle and lateral manibular surfaces
What is the action of the masseter?
Lifting of the lower jaw
What nerve innervates the masseter?
mandibular nerve
What is the insertion of the temporalis?
apex and medial surface of coronoid process of manidble
What is the action of the temporalis?
moves mandible up/back, side to side
What nerve innervates the temporalis?
Mandubular nerve
What inserts the digastric?
hyoid bone
What inserts the medial pterygoid?
Ramus
Mandibular angle
What inserts the lateral pterygoid?
anterior side of the condyle
What action does the digastric perform?
depresses mandible
elevates hyoid bone
What action does the medial pterygoid perform?
closing the jaw
What action does the lateral pterygoid perform?
depresses and protrudes mandible
When chewing, what muscles are involved?
Masseter - prime chewing muscle
Temporalis - TMJ joint movement
Medial/lateral pterygoid - elevates, depresses maxilla
What is a fontanel?
Fibrous membranes connecting fetal skull bones
