Anatomy: Mid Back

Muscle	Attachements	Nerve Supply	Actions	Special Tests
Latissimus Dorsi	O: Spinous processes of lower 6 thoracic vertebrae, iliac crest, inferior 3 or 4 ribs, thoracolumbar fascia I: intertubercular groove of humerus	Thoracodorsal Nerve	– Extend shoulder – Adduct shoulder – Internally rotate shoulder	Shoulder Adductors Length Test
Serratus Anterior	O: Lateral 1^st – 8^th rib I: Anterior surface of medial border of scapula	Long Thoracic Nerve	– Protracts scapula – Rotates scapula	Serratus Anterior Strength Test
Inercostals	O: Inferior border of rib I: Superior border of rib below	Intercostal Nerve	– During forced inspiration, elevates ribs	N/A

Dylan Crake RMT