Muscles of the latissimus group

Question 1

Answer 1

Latissimus Dorsi

Origin: spinous process of lower thoracic, lumbar, and sacral vertebrae, iliac crest, and lower ribs

Insertion: intertubercular groove and lesser tubercle

Action: extends, adducts, and medially rotates humerus at the shoulder

Innervation: Brachial plexus

Question 2

Answer 2

Teres Major

Origin: lateral border of the scapula

Insertion: lesser tubercle

Action: extends, adducts, and medially rotates humerus at the shoulder

Innervation: Brachial Plexus

Question 3

Answer 3

Subscapularis

Origin: Ventral surface of the scapula

Insertion: lessertubercle of humerus

Action: adducts, and medially rotates humerus at the shoulder

Innervation: Brachial Plexus