Which of the following is an extrinsic shoulder muscle?
The trapezius, latissimus dorsi, levator scapulae, and rhomboids are extrinsic shoulder muscles. The deltoid, teres major, supraspinatus, infraspinatus, teres minor, and subscapularis are intrinsic shoulder muscles
Which of the following is true in respect to the trapezius?
The trapezius, innervated by the spinal root of the accessory nerve (XI), is composed of three types of fibers. Its superior fibers elevate the scapula, its middle fibers retract the scapula, and its inferior fibers depress the scapula. Its superior and inferior fibers act together in rotating the scapula on the thoracic wall
A patient is asked to place the hands posteriorly on the hips and to push the elbows posteriorly against resistance. Which muscle is being tested?
To test the rhomboids, the patient is asked to place the hands posteriorly on the hips and to push the elbows posteriorly against resistance
Which rotator cuff muscle does NOT rotate the humerus?
The supraspinatus is the only rotator cuff muscle that does not rotate the humerus
The axillary nerve innervates which of the following muscles?
The axillary nerve innervates both the deltoid and the teres minor
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Which of the following is NOT contained in the axilla?
The axilla contains axillary blood vessels, lymph nodes, the cords and branches of the brachial plexus, and the axillary nerve. The trunks and divisions are found superior to the axilla in the neck
Which of the following is most correct?
The subscapular artery arises from the third part of the axillary artery and contributes to blood supply of muscles near the scapula and humerus
Which of the following is NOT correct?
The brachial plexus is formed by the union of the ventral rami of C5 through T1. The roots of the brachial plexus and the subclavian artery pass through the gap between the anterior and middle scalene muscles. Gray rami contribute sympathetic fibers to each root. The roots of the brachial plexus form three trunks, each of which divides into anterior and posterior divisions. The cords of the brachial plexus surround the axillary artery
Which of the following is NOT a supraclavicular branch of the brachial plexus?
The dorsal scapular nerve, long thoracic nerve, nerve to the subclavius, and suprascapular nerve are supraclavicular branches of the brachial plexus, whereas the lateral pectoral nerve is an infraclavicular branch, originating from the lateral cord
Which of the following is true regarding the quadrangular space?
The quadrangular space is bounded superiorly by the subscapularis and teres minor, inferiorly by the teres major, medially by the long head of triceps, and laterally by the humerus. It contains the axillary nerve and the posterior circumflex humeral artery
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Which of the following is NOT innervated by the suprascapular nerve?
The suprascapular nerve innervates the supraspinatus, infraspinatus, and glenohumeral (shoulder) joint
Which of the following is NOT a branch of the posterior cord of the brachial plexus?
The posterior cord gives rise to the upper and lower subscapular nerves, thoracodorsal nerve, axillary nerve, and radial nerve. The long thoracic nerve originates from C5–C6–C7
Which of the following is NOT true in respect to the brachialis?
The brachialis originates from the distal half of the anterior surface of the humerus and inserts on the coronoid process and tuberosity of the ulna. It crosses one joint, flexing the forearm in all positions. While it is primarily innervated by the musculocutaneous nerve, some of its lateral part is innervated by a branch of the radial nerve
A patient is asked to abduct the arm 90 degrees and then to extend the flexed forearm against resistance. Which muscle is being tested?
To test the triceps brachii, the arm is abducted 90 degrees and then the flexed forearm is extended against resistance
The deep artery of the arm accompanies which of the following before passing around the body of the humerus?
The deep artery of the arm accompanies the radial nerve through the radial groove and passes around the body of the humerus
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