origin insertion action Flashcards
Occipitofrontalis: insertion and action
Insertion: Epicranial aponeurosis, skin superior to supraorbital margin
Action: Draws scalp anterior (raises eyebrows) posterior
Orbicularis oris: action
closes lips
Orbicularis Oculi: action
closes eyes
Zygomaticus major: origin
zygomatic bone
Levator labii superioris: action
Elevates upper lip
Depressor labii inferioris: action
depresses lower lip
Superior rectus: action
Elevates eyeball
Medial rectus: action
Adducts eyeball
Inferior rectus: action
Depresses eyeball
Lateral rectus: action
Abducts eyeball
Masseter: origin, insertion, action
Origin: Zygomatic arch & maxilla
Insertion: Ramus and angle of mandible
Action: Elevates mandible
Lateral pterygoid: action
Depression of mandible & moves mandible side to side
Sternocleidomastoid: Origin, insertion, action
Origin: Manubrium of sternum and clavicle
insertion: Mastoid process
Action: Both: flexion of cervical vertebrae. Individually: lateral rotation of head.
Pectoralis Major: origin, insertion, action
Origin: Clavicle, sternum, & costal cartilage
Insertion: Greater tubercle & Intertubercular sulcus of humerus
Action: Flexes, adducts, rotates humerus (arm) @ shoulder
Levator Scapulae: origin, insertion, action
Origin: Transverse process of C1-C4
insertion: Superior border of scapula
Action: Elevates scapula