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Questions and Answers
Which muscle is primarily responsible for scapular protraction?
Which muscle is primarily responsible for scapular protraction?
What is the origin of the Serratus Anterior?
What is the origin of the Serratus Anterior?
Which action is NOT performed by the Rhomboids?
Which action is NOT performed by the Rhomboids?
Which nerve innervates the Serratus Anterior muscle?
Which nerve innervates the Serratus Anterior muscle?
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What is the consequence of weakness or injury to the Serratus Anterior?
What is the consequence of weakness or injury to the Serratus Anterior?
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Which muscle group is primarily responsible for stabilizing the Glenohumeral joint?
Which muscle group is primarily responsible for stabilizing the Glenohumeral joint?
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What is the insertion point of the Pectoralis Major muscle?
What is the insertion point of the Pectoralis Major muscle?
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Which action is primarily performed by the Latissimus Dorsi during shoulder movement?
Which action is primarily performed by the Latissimus Dorsi during shoulder movement?
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Which of the following muscles is innervated by the Brachial Plexus?
Which of the following muscles is innervated by the Brachial Plexus?
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What action does the Medial Group primarily accomplish at the Glenohumeral joint?
What action does the Medial Group primarily accomplish at the Glenohumeral joint?
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Which muscle serves as the primary mover for GH Flexion?
Which muscle serves as the primary mover for GH Flexion?
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What is the origin of the Infraspinatus muscle?
What is the origin of the Infraspinatus muscle?
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Which of the following muscles is NOT a part of the rotator cuff?
Which of the following muscles is NOT a part of the rotator cuff?
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Which muscle is primarily responsible for GH abduction?
Which muscle is primarily responsible for GH abduction?
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What nerve innervates the Deltoid muscle?
What nerve innervates the Deltoid muscle?
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Which of the following muscles acts as an antagonist to the actions of the Teres Major during adduction?
Which of the following muscles acts as an antagonist to the actions of the Teres Major during adduction?
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Where does the Biceps Brachii originate?
Where does the Biceps Brachii originate?
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What action is primarily performed by the muscles innervated by the Musculocutaneous Nerve?
What action is primarily performed by the muscles innervated by the Musculocutaneous Nerve?
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Which muscles are included in the Rotator Cuff?
Which muscles are included in the Rotator Cuff?
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Which of the following actions does NOT involve the glenohumeral joint?
Which of the following actions does NOT involve the glenohumeral joint?
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Which statement about the Teres Major is false?
Which statement about the Teres Major is false?
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Study Notes
Teres Major
- Teres Major is a muscle that adducts (brings toward the midline) at the Glenohumeral joint.
- Teres Major, Teres Minor, and Infraspinatus all attach to the Intertubercular Sulcus on the Humerus.
Deltoid
- The Deltoid is the prime mover of abduction (raising away from the midline) at the Glenohumeral joint.
- The Deltoid muscle has an intramuscular injection site.
- The Deltoid muscle originates from the Clavicle and Scapula and inserts on the Humerus.
Rotator Cuff
- The Rotator Cuff is a group of four muscles that stabilize the Glenohumeral joint and rotate the shoulder, consisting of Subscapularis, Supraspinatus, Infraspinatus, and Teres Minor (SITS).
- The Rotator Cuff muscles originate from the Scapula and insert on the Humerus.
Latissimus Dorsi
- Latissimus Dorsi is the prime mover of extension (moving away from the torso) at the Glenohumeral joint.
- Latissimus Dorsi originates from the T6-L5 Spinous Processes, Ribs, and Iliac Crest and inserts on the Humerus (Intertubercular Sulcus).
Pectoralis Major
- Pectoralis Major is the prime mover of flexion (bringing toward the torso) at the Glenohumeral joint.
- Pectoralis Major originates from the Clavicle, Sternum, and Ribs and inserts on the Humerus.
- Pectoralis Major and Latissimus Dorsi both Adduct (bring toward the midline) at the Glenohumeral joint.
Coracobrachialis
- Coracobrachialis is a synergist (a muscle that works together with another muscle) of flexion at the Glenohumeral joint.
Biceps Brachii
- Biceps Brachii acts as a synergist of flexion at the Glenohumeral joint.
- Biceps Brachii also acts as the prime mover of flexion at the elbow joint.
- Biceps Brachii originates from the Scapula (coracoid process and supraglenoid tubercle), and inserts on the Radius.
Levator Scapulae
- Levator Scapulae elevates the Scapula.
Rhomboids
- The Rhomboids function to retract the Scapula.
Serratus Anterior
- The Serratus Anterior protracts (brings forward) the Scapula and helps hold it against the chest wall.
- Weakness or injury to the Serratus Anterior can lead to Scapular Winging.
Pectoralis Minor
- Pectoralis Minor is a protractor of the Scapula.
- Pec Minor may be an impingement source for Thoracic Outlet Syndrome.
- Pec Minor is also a possible impingement site for Thoracic Outlet Syndrome, along with the Scalenes and Clavicle.
Brachial Plexus
- The Brachial Plexus is a network of nerves that innervates the upper limb (shoulder, arm, and hand).
- Branches of the Brachial Plexus may innervate the following muscles:
- Latissimus Dorsi
- Rhomboid Major and Minor
- Pectoralis Major and Minor
- Serratus Anterior
- Teres Major
- Rotator Cuff
- Deltoid
- Biceps Brachii
- Pectoralis Minor
- Forearm muscles, intrinsic Hand muscles, Brachioradialis, Elbow Extensors and Flexors.
Musculocutaneous Nerve
- The Musculocutaneous Nerve innervates two elbow flexors (Biceps Brachii and Brachialis).
Thoracic Outlet Syndrome
- Thoracic Outlet Syndrome occurs when the space between the clavicle and the first Rib is compressed, affecting the blood vessels and nerves of the upper limb.
- This can cause pain, numbness, weakness, and cold in the arm and hand.
Glenohumeral Joint
- The Glenohumeral Joint involves the articulation between the Humerus and the Glenoid Fossa of the Scapula.
Sternoclavicular (SC) Joint
- The Sternoclavicular Joint is the articulation between the Clavicle and the Sternum.
Elbow Joint
- The Elbow Joint, also referred to as the Cubital Joint, is the articulation between the Humerus, Radius, and Ulna.
- The Brachialis muscle is a prime mover of flexion at the Elbow.
- The Brachialis originates from the anterior surface of the distal Humerus, and inserts on the coronoid process of the Ulna.
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Description
Test your knowledge on the major muscles of the shoulder, including the Teres Major, Deltoid, Rotator Cuff, and Latissimus Dorsi. This quiz covers their functions, origins, and insertions at the Glenohumeral joint. Are you ready to delve into muscular anatomy?
