ANATOMY-UB-BACK-MUSCLES-LATS & TERES MAJOR


MUSCLE ANATOMY – LATS & TERES MAJOR


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LATISSIMUS DORSI


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Primary Actions of the Latissimus Dorsi – source: Physiopedia .

  1. Adduction of the arm at shoulder
    Agonists: Pectoralis MajorTeres MajorTriceps Brachii (long head)
    Antagonists: Deltoid (middle) Supraspinatus
  2. Extension of the arm at the shoulder
    Agonists: Deltoid (posterior) Triceps brachii (long head), Pectoralis Major (sternal head)
    Antagonists: Deltoid (anterior) Biceps brachiiCoracobrachialisPectoralis Major (clavicular head)
  3. Internal rotation of the arm at the shoulder
    Agonists: SubscapularisDeltoid (anterior), Pectoralis MajorTeres Major
    Antagonists:
     InfraspinatusTeres minorDeltoid (posterior)

Secondary Actions of the Latissimus Dorsi

  1. Assists with extension of the trunk
    Agonists: Longissimus thoracisIliocostalis lumborum, Iliocostalis thoracis
    Antagonists: Rectus abdominis
  2. Assists with flexion of the trunk
    AgonistRectus abdominis
    Antagonists:
     Longissimus thoracisIliocostalis lumborum, Iliocostalis thoracis
  3. Assists with lateral flexion of the trunk
    Agonist: Quadratus lumborumRectus abdominis
    Antagonists:
     Longissimus thoracisIliocostalis lumborum, Iliocostalis thoracis
  4. Assists with anterior and lateral pelvic tilt
    Agonist: Rectus abdominis
    Antagonists:
     SemitendinosusSemimembranosusBiceps femoris
  5. Assists with depression of the scapula
    Agonists: Serratus Anterior (lower fibers), Trapezius (lower fibers), Pectoralis minor
    Antagonists:
     Levator ScapulaeTrapezius (upper fibers)
  6. Assist with protraction of the scapula
  7. Assists with deep inspiration and forced expiration [5]

TERES MAJOR


  • Adducts and Internally Rotates the arm[5]

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– Sarah Freeman – Medical Illustrator .


YOUTUBE VIDEOS


  1. ABELSON – DC – 18 MUSCLES OF THE SPINE – Start at 10:50
  2. NOTED ANATOMIST – SUPERFICIAL BACK MUSCLES .
    (1) Traps (2) Rhomboids (3) Levator Scapulae (4) Latissimus Dorsi
  3. NOTED ANATOMIST – GLENOHUMERAL JOINT .
    (1) Pectoralis Major (2) Teres Major (3) Latissimus Dorsi
  4. ANATOMY ZONE – EXTRINSIC MUSCLES .
  5. WEBSTER – LARGE SHOULDER MUSCLES .
    – Traps 6:15 | LATS 9:15 | Rhomboids 17:30 | Levator Scapulae 18:30 | Teres Major 20:20






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