Muscle Attachments and Injuries Quiz

A 34-year-old man presents after a fall onto his shoulder. On examination, he has weakness initiating shoulder abduction and pain on palpating the superior angle of the scapula. Which muscle is most likely injured?

• Teres minor

• Supraspinatus

• Infraspinatus

• Serratus anterior

A 22-year-old swimmer complains of sharp posterior shoulder pain during overhead movements. MRI shows inflammation at the medial border of the scapula. Which of the following muscles originates from this region?

• Rhomboid major

• Deltoid

• Subscapularis

• Teres major

During a lymph node dissection, a surgeon accidentally severs a nerve passing through the suprascapular notch. What movement will most likely be weakened?

• Medial rotation of humerus

• Arm extension

• Lateral rotation and abduction initiation

• Flexion of arm

A patient presents with winging of the scapula. Which muscle attached to the anterior medial border of scapula is affected?

• Subscapularis

• Trapezius

• Serratus anterior

• Teres major

A baseball player has pain at the inferior angle of the scapula and difficulty extending his arm. What muscle originates here?

• Infraspinatus

• Rhomboid minor

• Teres major

• Coracobrachialis

A weightlifter complains of pain in his upper arm when internally rotating his shoulder. Imaging reveals inflammation at the lesser tubercle of humerus. Which muscle inserts here?

• Teres minor

• Supraspinatus

• Subscapularis

• Infraspinatus

A patient has weakness in arm abduction after trauma. MRI shows avulsion of the greater tubercle of the humerus. Which of the following muscles is NOT attached here?

• Infraspinatus

• Teres minor

• Supraspinatus

• Subscapularis

A surgical fracture of the humerus shaft affects the radial groove. Which muscle originates from this area and extends the forearm?

• Triceps brachii

• Biceps brachii

• Coracobrachialis

• Anconeus

After a stab wound to the anterior arm, a man is unable to flex his elbow. The muscle injured originates from the anterior distal half of the humerus. What muscle is likely damaged?

• Coracobrachialis

• Brachialis

• Biceps brachii

• Triceps brachii

Which muscle inserts on the deltoid tuberosity of the humerus?

• Deltoid

• Supraspinatus

• Brachialis

• Pectoralis major