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Questions and Answers
The ______ originates from the lateral 3rd of clavicle and acromion.
Deltoid
The ______ adducts and medially rotates the arm.
Teres Major
The ______ is responsible for retracting the scapula and elevating it.
Rhomboid Major
The ______ is located in the supraspinatus fossa of the scapula.
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The ______ laterally rotates the arm.
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The ______ depresses the scapula.
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The ______ extends, adducts, and medially rotates the humerus.
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The ______ originates from the spinous processes of T2-5.
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The ______ medially rotates the arm and is located in the subscapular fossa.
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The ______ attaches at the inferior facet of the greater tubercle.
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The ______ anterior is responsible for protraction of the scapula.
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The coracobrachialis originates from the tip of the ______ process.
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The short head of the biceps brachii is connected to the ______ of the radius.
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The brachialis muscle flexes the forearm in all ______.
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The long head of the triceps brachii originates from the infragenoid ______ of the scapula.
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The medial head of the triceps brachii is located on the posterior surface of the ______.
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The anconeous muscle assists in elbow ______.
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The biceps brachii, when contracted, helps in flexing and ______ the arm.
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The lateral head of the triceps is found on the posterior surface of the ______.
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Flexing and adducting the arm is primarily the function of the ______ muscle.
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Study Notes
Shoulder Muscles
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Trapezius muscle fibers work together to control scapular movement:
- Upper fibers elevate the scapula
- Middle fibers retract the scapula
- Lower fibers depress the scapula
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Deltoid abducts the arm (middle fibers), and assists in:
- Medial/lateral rotation (anterior/posterior fibers)
- Flexion/extension (anterior/posterior fibers)
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Teres Minor laterally rotates the arm
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Teres Major adducts and medially rotates the arm
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Rhomboid Major and Minor retract the scapula
- Major extends from T2-T5 spinous processes to the medial border of the scapula
- Minor extends from C7/T1 spinous processes and nuchal ligament to the medial border of the scapula
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Latissimus Dorsi extends, adducts, and medically rotates the humerus
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Supraspinatus abducts the arm
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Infraspinatus laterally rotates the arm
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Subscapularis medially rotates the arm
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Pectoralis Major adducts and medially rotates the humerus
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Pectoralis Minor depresses the scapula
Arm Muscles
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Serratus Anterior protracts the scapula
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Coracobrachialis flexes and adducts the arm
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Biceps Brachii flexes and supinates the arm
- Short head: originates on the coracoid process
- Long head: originates on the supraglenoid tubercle
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Brachialis flexes the forearm in all positions, including pronation
Forearm Muscles
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Triceps Brachii extends the forearm
- Long head: originates on infraglenoid tubercle
- Lateral head: originates on posterior humerus, superior to radial groove
- Medial head: originates on posterior humerus, inferior to radial groove
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Anconeus extends the forearm
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Description
Test your knowledge on the anatomy and functions of the shoulder muscles! This quiz covers key muscles such as the trapezius, deltoid, teres minor, and more, along with their specific actions. Perfect for students and enthusiasts of human anatomy.
