Origins
Where does the Latissimus Dorsi originate from?
Spinous process of T6-T12, L1-L5 (thoracolumbar fascia), & posterior aspect of the iliac crest
What inserts on the superior angle of the scapula and superior medial border?
Levator Scapulae
What is the action of the Deltoid?
Together: abduction of shoulder
Anterior: flexion and IR of humerus
Middle: abduction of humerus
Posterior: extension and ER of humerus
What nerve innervates the Serratus Anterior?
Long thoracic nerve
Suprascapular artery
What muscle originates from spinous processes of T2-T5?
Rhomboid Major
Where does the Infraspinatus insert?
Middle facet of greater tubercle of humerus
What is the action of the Trapezius?
Superior/Descending: elevate scapula
Middle: retracts scapula
Inferior/Ascending: depress the scapula
Superior & Inferior: rotate glenoid fossa superiorly
What nerve innervates the Latissimus Dorsi?
Thoracodorsal nerve
What is the blood supply to the Trapezius?
Transverse cervical artery
Where does the Pectoralis Major originate from?
Clavicular head: anterior surface of medial 1/2 of clavicle
Sternocostal head: anterior surface of sternum, costal cartilage ribs 1-6, aponeurosis of external oblique
What muscle inserts on lateral lip of intertubercular groove?
Pectoralis Major
What is the action of the Teres Major and Latissimus Dorsi?
Adduction, extension, and internal rotation
What nerve innervates Pectoralis Major?
Medial & Lateral pectoral nerves
What is the blood supply to the Deltoid?
Thoracoacromial artery (deltoid branch)
What muscle originates from the lateral external surfaces of ribs 1-8?
Serratus Anterior
What muscle inserts on the medial lip of the intertubercular groove?
Teres Major
What is the action of the Pectoralis Minor?
Draws scapula inferior and anteriorly (stabilizes)
What nerve innervates the Subscapularis?
Upper and lower subscapular nerve
What is the blood supply to the Levator Scapulae?
Dorsal scapular a.
What muscle originates from the lateral border of the scapula and the inferior angle of the scapula?
Teres Major
Where does the Serratus Anterior insert?
Anterior surface of medial border of scapula
What is the action of the Serratus Anterior?
Protracts scapula, stabilizes, rotates scapula upwards
What nerve innervates the Teres Minor and Deltoid?
Axillary nerve
What is the blood supply of the Teres Major?
Subscapular artery
Posterior humeral circumflex artery