Question | Answer |
Which muscle(s) originate at the clavicle, acromion, and spine of the scapula? | Deltoids |
Where are the deltoids inserted? | Deltoid tuberosity |
Which muscles perform abductions of the shoulder? | Deltoids, supraspinatus, and serratus anterior |
Where are the deltoids innervated? | Axillary C5 and C6 |
What actions do both rhomboid major and minor perform? | Adduct, elevate, and downward rotation of the shoulder girdle |
What muscles are innervated at dorsal scapular C4 and C5? | Rhomboid major and minor |
Where does rhomboid major originate? | Spinous process of T2 and T5 |
Where does rhomboid minor originate? | Spinous process of C7 and T2 |
What muscle(s) are inserted at the medial border of the scapula? | Rhomboid major, rhomboid minor, serratus anterior, and levator scapulae |
Where does teres major originate? | The inferior angle and lower lateral border of the scapula |
What muscle is inserted at the crest of the lesser tubercle of the humerus? | Teres major, subscapularis |
Which muscles perform medial rotation of the scapula? | Teres major, subscapularis, and latissimus dorsi |
What actions does teres major perform? | Extension, adduction, and medial rotation of the scapula |
What muscle is innervated at lower subscapular C5, C6, and C7? | Teres major |
Which muscle is located at the upper 8-9 ribs? | Serratus anterior |
Where is serratus anterior inserted? | The anterior surface of the medial border of the scapula |
What actions does serratus anterior perform? | Abduction, upward rotation, and depression of the scapula, and holds the medial border of the scapula |
What muscle is innervated at the long thoracic nerve? | Serratus anterior |
Where is the supraspinatus originated? | Supraspinous fossa of the scapula |
What muscle(s) are inserted at the greater tubercle of the humerus? | Supraspinatus, teres minor, and infraspinatus |
What actions does supraspinatus perform? | Abduction of the shoulder, stabilizes the head of the humerus |
What muscle(s) are innervated at the subscapular? | Supraspinatus and infraspinatus |
What muscle is located at the upper 2/3 of the lateral border of the scapula? | Teres minor |
What actions does teres minor perform? | Lateral rotation and adduction of the shoulder joint, and stabilizes the head of the humerus |
What muscle is innervated at axillary C5 and C6? | Teres minor |
What muscle originates at vertebrae C7 through C12? | Trapezius |
Where is the trapezius inserted? | Clavicle, acromion, and spine of the scapula |
What action does the trapezius perform? | Extension of the head and neck |
What muscle is innervated at the cranial nerves C2, C3, and C4? | Trapezius |
Where does latissimus dorsi originate? | Inferior angle of the scapula, last 3 or 4 ribs, posterior iliac crest, thoracolumbar aponeurosis and the spinous process of the last 6 vertebrae. |
What muscle is innervated at thoracodorsal C6, C7, and C8? | Latissimus Dorsi |
What actions does latissimus dorsi perform? | Extension, adduction, and medial rotation of the shoulder |
Where is latissimus dorsi inserted? | The intertubercular groove of the humerus |
Where does the subscapularis originate? | The subscapular fossa of the scapula |
Where is the subscapularis inserted? | The lesser tubercle of the humerus |
What actions does the subscapularis perform? | Medial rotation of the shoulder and stabilization of the head of the humerus. |
What muscle is innervated at the upper and lower subscapular C5 and C6? | Subscapularis |
What muscle originates at the infraspinous fossa of the scapula? | Infraspinatus |
What actions does the infraspinatus perform? | Lateral rotation and adduction of the shoulder, and stabilization of the head of the humerus |
What muscle originates at the transverse process of the 1st-4th cervical vertebrae? | Levator scapulae |
What actions does the levator scapulae perform? | Elevation and downward rotation of the scapula, rotation and lateral flex of the head and neck. |
What muscle is innervated at the cervical 3 and 4 and dorsal scapular C4 and C5? | Levator scapulae |