Anatomy: Mid Back


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

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