Muscles: Origin, Insertion, Action Part 1 Flashcards
Of the tongue, anterior neck, face
Where is the origin of the Genioglossus?
Medial surface of mandible around chin
Where is the insertion of the Genioglossus?
Body of tongue, hyoid bone
What is the action of the Genioglossus?
Depresses and protracts tongue
Where is the origin of the Sternocleidomastoid?
One head attaches to sternal end of clavicle; the other head attaches to manubrium
Where is the insertion of the Sternocleidomastoid?
Mastoid region of skull and lateral portion of superior nuchal line (temporal bone)
What is the action of the Sternocleidomastoid?
Flexes the neck; one alone bends head toward shoulder and rotates neck
Where is the origin of the Occipitofrontalis?
Epicranial aponeurosis; occipital/frontal
Where is the insertion of the Occipitofrontalis?
Eyebrow; epicranial aponeurosis
What is the action of the Occipitofrontalis?
Raise eyebrows; Tense scalp
Where is the origin of the Platysma?
2nd rib/ acromion
Where is the insertion of the Platysma?
Mandible/Cheek
What is the action of the Platysma?
Tense neck, Depress Mandible, pull lip interior
Where is the origin of the Orbicularis Oculi?
Medial orbit
Where is the insertion of the orbicularis oculi?
Eyelids
What is the action of the orbicularis oculi?
Close eyes
Where is the origin of the Temporalis?
Temporal
Where is the insertion of the Temporalis?
Mandible
What is the action of the Temporalis?
Jaw closer
Where is the origin of the Orbicularis Oris?
Maxilla/mandible
Where is the insertion of the Orbicularis Oris?
Lips
What is the action of the Orbicularis Oris?
Close lips
Where is the origin of the Masseter?
Zygomatic arch
Where is the insertion of the Masseter?
Mandible
What is the action of the Masseter?
Jaw closer
Where is the origin of the Lateral Pterygoid?
Sphenoid
Where is the insertion of Lateral Pterygoid?
Mandible
What is the action of the Lateral Pterygoid?
Jaw opener/lateral
Where is the origin of the Medial Pterygoid?
Sphenoid
Where is the insertion of the Medial Pterygoid?
Mandible
What is the action of the Medial pterygoid?
Jaw closer/medial
