Iupui Anatomy Yard Exam 3 - Questions/answers

Internal Oblique Action {Ans: compresses abdomen; depresses ribs; flexes, laterally flexes, or rotates vertebral column to the same side}Temporalis Action {Ans: elevates mandible and closes jaws; assists in retracting and moving mandible from side to side}Rectus Abdominis Origin&Insertion {Ans: Origin- Superior surface of pubis around symphysis Insertion- Inferior surfaces of cartilages(ribs 5-7) and xyphoid process of sternum}Buccinator Origin&Insertion {Ans: Origin- alveolar processes of maxilla and mandible opposite the molar teeth Insertion- Blends into fibers of obicularis oris}Occipitofrontalis- Occipital Belly O&I {Ans: Origin- superior nuchal line and adjacent region of mastoid portion of the temporal bone Insertion- Epicranial aponeurosis}Masseter Origin&Insertion {Ans: Origin- aponeurosis and bones of the zygomatic arch Insertion- lateral surface and angle of mandibular ramus}Omohyoid Origin&Insertion {Ans: Origin- superior border of the scapula near the suprascapular notch Insertion- hyoid bone}External oblique Action {Ans: compresses abdomen; depresses ribs; flexes, laterally flexes, or rotates vertebral column to the opposite side}Sternohyoid Action {Ans: depresses hyoid bone and larynx}Digastric- Posterior Belly Origin&Insertion {Ans: Origin- From mastoid region of temporal bone Insertion- hyoid bone (same as anterior belly)}Masseter Action {Ans: elevates mandible and closes jaws; assists in protracting and retracting mandible and moving