Muscle
Origin: Spinous process of T7-12, the lower 3 or 4 ribs, the thoracolumbar fascia of the lumbar and sacral vertebra, the medial 3rd of the posterior iliac crest and in some an attachment to the inferior angle of the scapula.
Insertion: The intertubercular or bicipital groove of the Humerus.
Action: Medially rotates, adducts and extends the arm, depresses the shoulder girdle. Assists in lateral flexion of the torso, tilting the pelvis anterior and laterally and hyper extending the spine.
Monitoring
Position: With elbow held straight adduct and extend the arm to a position parallel to the body 5° posterior to the midline (ie hand pressed against table).
Rotation: Medially rotate Humerus (little finger upwards, thumb on table side).
Stabilise: Same side pelvis.
Monitor: Apply pressure at the forearm above the wrist to abduct the arm with slight flexion.
Correction
Nerve Supply: Thoracodorsal - C6, C7, C8.
Visceral Nerves:
Sympathetic: L1-L3
Parasympathetic: S2
Neuro-Lymphatic Reflex:
Anterior: Bilateral 2cm from the midline, 2cm superior to the pubic symphysis
Posterior: Bilateral transverse process of L2.
Neuro-Vascular Reflex: Bilateral frontal eminences.
Yuan Point: Bl64
Nutrition: Vit. A.