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muscle o, i and a
origin, inserion and action
| muscle | origin | action |
|---|---|---|
| Occipitofrontalis (frontal belly) | Epicranial aponeurosis(o) Skin superior to supraorbital margin(i) | Draws scalp anteriorly, raises eyebrows, and wrinkles skin of forehead horizontally as in a look of surprise |
| Occipitofrontalis (occipital belly) | Occipital bone and mastoid process of temporal bone(o) Epicranial aponeurosis(i) | Draws scalp posteriorly |
| Orbicularis oculi | Medial wall of orbit(o) Circular path around orbit(i) | closes eye |
| Orbicularis oris | Muscle fibers surrounding opening of mouth(o) Skin at corner of mouth(i) | Closes and protrudes lips, as in kissing; compresses lips against teeth; and shapes lips during speech |
| Zygomaticus major | Zygomatic bone(o) Skin at angle of mouth and orbicularis oris(i) | Draws angle of mouth superiorly and laterally, as in smiling |
| Zygomaticus minor | Zygomatic bone(o) Upper lip(i) | Raises (elevates) upper lip, exposing maxillary (upper) teeth |
| Buccinator | Alveolar processes of maxilla and mandible and pterygomandibular raphe (fibrous band extending from the pterygoid process of the sphenoid bone to the mandible)(o) orbicularis oris(i) | Presses cheeks against teeth and lips, as in whistling, blowing, and sucking; draws corner of mouth laterally; and assists in mastication (chewing) by keeping food between the teeth (and not between teeth and cheeks) |
| Sternocleidomastoid | Sternum and clavicle(o) Mastoid process of temporal bone(i) | Acting together (bilaterally), flex cervical portion of vertebral column, flex head, and elevate sternum during forced inhalation; acting singly (unilaterally), laterally rotate and flex head to side opposite contracting muscle. The posterior fibers of th |
| Sternohyoid | Medial end of clavicle and manubrium of sternum(o) Body of hyoid bone(i) | Depresses hyoid bone |
| Sternothyroid | Manubrium of sternum(o) Thyroid cartilage of larynx(i) | Depresses thyroid cartilage of larynx(i) |
| Thyrohyoid | Thyroid cartilage of larynx(o) Greater horn of hyoid bone(i) | Elevates thyroid cartilage and depresses hyoid bone |
| Omohyoid | Superior border of scapula and superior transverse ligament(o) Body of hyoid bone | Depresses hyoid bone |
| Levator scapulae | Transverse processes of C1–C4(o) Superior vertebral border of scapula(i) | Elevates scapula and rotates it downward |
| Trapezius | Superior nuchal line of occipital bone, ligamentum nuchae, and spines of C7–T12(o) Clavicle and acromion and spine of scapula(i) | Superior fibers upward rotate scapula; middle fibers adduct scapula; inferior fibers depress and upward rotate scapula; superior and inferior fibers together rotate scapula upward; stabilizes scapula |
| Scalenus anterior | Transverse processes of third through sixth cervical vertebrae(o) First rib(i) | Acting together, right and left anterior scalene and middle scalene muscles flex cervical vertebrae and elevate first ribs during deep inhalation; acting singly, laterally flex and rotate cervical vertebrae |
| Temporalis | Temporal bone(o) Coronoid process and ramus of mandible(i) | Elevates and retracts mandible |
Created by:
nsweety
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