MUSCLES – LATS & TERES MAJOR
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TERES MAJOR
- Adducts and Internally Rotates the arm[5]
- Extends the arm from a flexed position
LATISSIMUS DORSI
Primary Actions of the Latissimus Dorsi – source: Physiopedia .
- Adduction of the arm at shoulder
Agonists: Pectoralis Major, Teres Major, Triceps Brachii (long head)
Antagonists: Deltoid (middle) Supraspinatus - Extension of the arm at the shoulder
Agonists: Deltoid (posterior) Triceps brachii (long head), Pectoralis Major (sternal head)
Antagonists: Deltoid (anterior) Biceps brachii, Coracobrachialis, Pectoralis Major (clavicular head) - Internal rotation of the arm at the shoulder
Agonists: Subscapularis, Deltoid (anterior), Pectoralis Major, Teres Major
Antagonists: Infraspinatus, Teres minor, Deltoid (posterior)
Secondary Actions of the Latissimus Dorsi
- Assists with depression of the scapula
Agonists: Serratus Anterior (lower fibers), Trapezius (lower fibers), Pectoralis minor
Antagonists: Levator Scapulae, Trapezius (upper fibers) - Assist with protraction of the scapula
- Assists with deep inspiration and forced expiration [5]
- Assists with extension of the trunk
Agonists: Longissimus thoracis, Iliocostalis lumborum, Iliocostalis thoracis
Antagonists: Rectus abdominis - Assists with flexion of the trunk
Agonist: Rectus abdominis
Antagonists: Longissimus thoracis, Iliocostalis lumborum, Iliocostalis thoracis - Assists with lateral flexion of the trunk
Agonist: Quadratus lumborum, Rectus abdominis
Antagonists: Longissimus thoracis, Iliocostalis lumborum, Iliocostalis thoracis - Assists with anterior and lateral pelvic tilt
Agonist: Rectus abdominis
Antagonists: Semitendinosus, Semimembranosus, Biceps femoris
VIDEOS
- ABELSON – DC – 18 MUSCLES OF THE SPINE – Start at 10:50
- NOTED ANATOMIST – SUPERFICIAL BACK MUSCLES .
(1) Traps (2) Rhomboids (3) Levator Scapulae (4) Latissimus Dorsi - NOTED ANATOMIST – GLENOHUMERAL JOINT .
(1) Pectoralis Major (2) Teres Major (3) Latissimus Dorsi - ANATOMY ZONE – EXTRINSIC MUSCLES .
- WEBSTER – LARGE SHOULDER MUSCLES .
– Traps 6:15 | LATS 9:15 | Rhomboids 17:30 | Levator Scapulae 18:30 | Teres Major 20:20