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Neck, Pecs, and Abs

This guide details the anatomy and function of key muscles located in the neck, chest, and abdominal regions. Highlighted muscles include the sternocleidomastoid, splenius capitis, trapezius, rhomboideus major, levator scapulae, serratus anterior, pectoralis minor, and the abdominal wall muscles. Each muscle's origin, insertion, and action are discussed, emphasizing how they contribute to head movement, shoulder stability, scapula motion, and torso rotation. This information is essential for understanding human anatomy, particularly for students and health professionals.

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Neck, Pecs, and Abs

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  1. Neck, Pecs, and Abs

  2. O: sternum, clavicle I: Mastoid Process A: Pulls head side to side, raises sternum Sternocleidomastoid

  3. O: Cervical and thoracic vertebrae I: Mastoid process A: Rotates head, head side to side, or just straighten head Splenius Capitis

  4. O: Cervical and thoracic Vertebrae I: Occipital Bone A: Extends head Semispinalis Capitis

  5. Pectoralis Girdle

  6. O: Occipital bone, cervical and thoracic vertebrae I: Clavicle, scapula A: Rotates scapula, raises arms, scapulamedial, down Trapezius

  7. O: Thoracic Vert. I: Scapula A: Raises and adducts scapula Rhomboideus Major

  8. O: Cervical Vert. I: Scapula A: Elevates scapula Levator Scapulae

  9. O: Outer surface of ribs I: VENTRAL surface of the scapula A: Pulls Scapula anterior and downward Serratus Anterior

  10. O: Sternal end of ribs I: Coracoid process of the scapula A: Pulls scapula anteriorly, raises ribs Pectoralis Minor

  11. Abdominal Wall

  12. O: Lower ribs I: Ilium and linea alba A: Tenses abdominal wall, rotates torso External Oblique

  13. O: Crest of ilium, I: ribs, linea alba, pubis A: Tenses abdominal wall O: Crest of ilium, I: ribs, linea alba, pubis A: Tenses abdominal wall Internal Oblique

  14. O: Lower ribs, lumbar vert. ilium I: Linea alba, pubis A: Tenses abdominal wall Transverse Abdominus

  15. O: Pubis I: Xiphoid, costal cartilage A: Tenses abdominal wall, flexes spine. Rectus Abdominis

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