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
