Complete Table 9.1 with the origins, insertions, and main actions for the listed

Question

Complete Table 9.1 with the origins, insertions, and main actions for the listed muscles. You may notice in your textbook that the origin and insertion of a muscle often are extensive. For example, the latissimus dorsi muscle originates from T7-LS, the lower three or four ribs, the inferior angle of the scapula, a thoracolumbar fascia. This obviously is quite a bit to write and to remember, so I suggest shortening it to somethin makes sense to you (e.g.,"inferior back and scapula"). You also will notice that most muscles have more than one which you may wish to simplify as well. If your instructor prefers that you learn the more technical version, learni simplified version first may be helpful. TABLE 9.1 Muscle Origins, Insertions, and Actions Muscle Origin Insertion Action(s) Muscles of the Head and Neck Trapezius Muscles of the Thorax, Abdomen, and Back Rectus abdominis External oblique Internal oblique Erector spinae Deltoid Pectoralis major Latissimus dorsi (contin Muscular System: Muscle Tissue and the Gross Anatomy of MusclesI UNIT 9 215

Explanation / Answer

ans-sternocleidomastoid -sternum and clavicle -mastoid process of temporal (lateral process of mastoid process and lateral half ofthe superior nuchal line of occipital bone)-pulls head to one side raises sternum.

trapezius-superior t-superior nuchal line, external occipital protuberance, middle t vertebrae T1-T4, inferior t vertebrae T5-T12.

rectus abdominis-Pubic crest and symphysis -costal cartilage 5-7, Xiphoid process- flexes the vertebral column by approximating the throax and pelvis anteriorly.

external oblique-external surface and inferior borders of 5-12 ribs (lower 7 or 8 ribs) - iliac crest,linea alba, forms inguinal ligaments - flexes vertebral column, rotate torso in the opposite side.

Internal oblique- anterior iliac crest, lateral half of inguinal ligament - costal cartilages of ribs 8-12-flexes rotate laterally flexes torso at lower thoracic and upper lumber vertebral levels.

Related Questions

Navigate

• Browse (All)
• Browse C
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.