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muscle o, i and a

origin, inserion and 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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