Lab 3: Origins, Insertions, Actions Flashcards
what is the origin of the buccinator?
-maxilla
-mandible
-sphenoid
what is the insertion of the buccinator?
-orbicularius oris
what is the action of the buccinator?
-flattens cheek (presses it to teeth+lips)
-assists in chewing (keeps food between teeth)
-blowing, sucking, whistling
what is the origin of the frontal belly?
-epicranial aponeurosis
what is the insertion of the frontal belly?
-skin superior to the eyes and nose
what is the action of the frontal belly?
-raises eyebrows
-wrinkles forehead (horizontally)
-draws scalp anteriorly
what is the origin of the occipital belly?
-occipital bone
-mastoid process of the temporal bone
what is the insertion of the occipital belly?
-epicranial aponeurosis
what is the action of the occipital belly?
-draws scalp posteriorly
what is the origin of the masseter
-maxilla
-zygomatic arch
what is the insertion of the masseter?
-mandible
-what is the action of the masseter?
-elevates the mandible (closes mouth)
what is the origin of the orbicularis oculi?
-frontal bone
-maxilla
what is the insertion of the orbicularis oculi?
-eyelid
what is the action of the orbicularis oculi?
-closes eye
what is the origin of the orbicularis oris?
-maxilla
-mandible
what is the insertion of the orbicularis oris?
-lips
what is the action of the orbicularis oris?
-closes and protrudes lips (kissing)
-shapes lips during speech
what is the origin of the risorius?
-fascia over the salivary gland
what is the insertion of the risorius?
-skin at the angle of the mouth
what is the action of the risorius?
draws the angle of the mouth laterally (grimacing)
what is the origin of the sternocleidomastoid?
-clavicle
-sternum
what is the insertion of the sternocleidomastoid?
-mastoid process on the temporal bone
what is the action of the sternocleidomastoid?
-elevates, flexes, and extends the head and neck
what is the origin of the temporalis?
-temporal bone
what is the insertion of the temporalis?
-coronoid process of the mandible
what is the action of the temporalis?
-elevate and retract the mandible
what is the origin of the trapezius?
-occipital bone
what is the insertion of the trapezius?
-clavicle
-scapula
what is the action of the trapezius?
-rotates, adducts, depresses, and stabilizes the scapula
what is the origin of the zygomaticus major?
-zygomatic bone
what is the insertion of the zygomaticus major?
-skin at the angle of the mouth
-orbicularis oris
what is the action of the zygomaticus major?
-draws the angle of the mouth superiorly + laterally (smiling)
what do the frontal belly and occipital belly create?
-occipitofrontalis
