Posterior Thoracoappendicular & Scapulohumeral Muscles

Question 1

Trapezius

Answer 1

O-External occipital protuberance, superior nuchal line, spinous processes of C7-T12
I-Lateral 1/3 of clavicle, acromion, and spine of scapula
N-Spinal accessory nerve
A-Superior fibers elevate and rotate superiorly, middle retract, inferior fibers depress the scapula

Question 2

Latissimus Dorsi

Answer 2

O-Spines of T7-T12, thoracolumbar fascia, iliac crest, ribs 9-12
I-Floor of intertubercular sulcus of humerus (similar to pec major)
N-Thoracodorsal nerve
A-Adducts, extends, and medially rotates humerus, retracts scapula

Question 3

Levator Scapulae

Answer 3

O-Transverse processes of C1-C4
I-Superior angle of scapula
N-Dorsal scapular nerve and C3-C4
A-Elevates scapula and rotates glenoid fossa of scapula inferiorly

Question 4

Rhomboids (major & minor)

Answer 4

O-Nuchal ligament and spinous process of C7-T5
I-Medial border of scapula
N-Dorsal scapular nerve
A-Retracts scapula, elevates scapula, and rotates glenoid fossa inferiorly

Question 5

Deltoid

Answer 5

O-Lateral 1/3 of clavicle, acromion, and spine of scapula (Insertion of trapezius)
I-Deltoid tuberosity of humerus
N-Axillary nerve (only this and Teres Minor)
A-Abducts, flexes (ant.), extends (post.), medially and laterally rotates humerus

Question 6

Teres Major

Answer 6

O-Dorsal surface of inferior angle of scapula
I-Medial lip of intertubercular sulcus of humerus
N-Lower subscapular nerve (also subscapularis)
A-Adducts and medially rotates humerus