Questions and Answers
Which nerve innervates the deltoid muscle?
What is the innervation of the pectoralis major muscle?
Which nerve provides innervation to the serratus anterior muscle?
Which muscle is innervated by the thoracodorsal nerve?
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What nerve innervates the subclavius muscle?
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Which muscle of the rotator cuff is innervated by the axillary nerve?
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What is the innervation type for the supraspinatus muscle?
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Which muscle is NOT part of the rotator cuff?
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Which rotator cuff muscle is innervated by both upper and lower subscapular nerves?
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Which nerve innervates the infraspinatus muscle?
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What is the primary function of the rotator cuff muscles?
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What action does the deltoid muscle perform at the shoulder?
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Which muscle is responsible for depressing and protracting the scapula?
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What is the action of the trapezius muscle when the shoulder is stationary?
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Which muscle performs adduction and flexion at the shoulder?
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What action does the serratus anterior perform when the scapula is stationary?
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What is the origin of the Supraspinatus muscle?
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Which muscle is primarily responsible for medial rotation at the shoulder?
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What is the action of the Infraspinatus muscle?
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Where does the Teres minor muscle insert?
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What action is associated with the Supraspinatus muscle?
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Which of the following muscles originates from the infraspinous fossa?
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Which muscle is responsible for both external rotation and weak adduction at the shoulder?
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What is the insertion point for the Subscapularis muscle?
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Which of the following muscles is NOT attached to the coracoid process?
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Which muscle attaches to the coracoid process and assists in shoulder flexion?
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Which of the following muscles contributes to the movement of the arm and is attached to the coracoid process?
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Which muscle is attached to the coracoid process and plays a role in elbow flexion?
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Of the following, which muscle does NOT originate from the coracoid process?
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Which nerve innervates the biceps brachii?
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Which muscle is NOT involved in moving the forearm?
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What is the primary function of the triceps brachii?
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Which muscle is located in the superficial layer of the anterior compartment of the arm?
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Which muscle assists primarily in flexing the wrist?
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What nerve innervates both the anconeus and the triceps brachii?
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Which of the following is NOT a muscle that moves the hand?
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What is the primary role of flexor retinaculum?
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Which head of the biceps brachii is responsible for long head function?
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Which muscle primarily allows for pronation of the forearm?
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What is the primary action of the biceps brachii muscle?
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Where does the brachialis muscle insert?
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Which muscle is responsible for extension at the elbow?
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What is the origin of the triceps brachii muscle?
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Which muscle contributes to supination of the forearm?
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What is the insertion point of the anconeus muscle?
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Which statement about the brachialis muscle is correct?
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Identify the two muscles that perform elbow extension.
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What is the action of the biceps brachii at the elbow?
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Which muscle has its origin on the lateral epicondyle of the humerus?
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Study Notes
Muscles of the Shoulder
- Deltoid: Abducts the shoulder; originates from the clavicle, acromion, and scapular spine; innervated by the axillary nerve.
- Pectoralis Major: Flexes, adducts, and medially rotates the shoulder; originates from ribs 2-6, body of the sternum, and clavicle; inserts at the crest of greater tubercle.
- Pectoralis Minor: Depresses, protracts, and downward rotates the scapula; originates from ribs 3-5; inserts at the coracoid process.
- Coracobrachialis: Adducts and flexes at the shoulder; originates from the coracoid process; inserts at the humerus; innervated by the musculocutaneous nerve.
- Serratus Anterior: Protracts and upwards rotates the scapula; originates from ribs 1-8; inserts on anterior surface of the scapula; innervated by the long thoracic nerve.
- Trapezius: Elevates, retracts, depresses, and rotates the scapula; originates from occipital bone, ligamentum nuchae, and thoracic vertebrae spinous processes; inserts at the acromion, spine of the scapula, and clavicle; innervated by cranial nerve XI (accessory nerve).
- Levator Scapulae: Elevates the scapula; originates from transverse processes of C1-C4; inserts at the vertebral border of the scapula; innervated by the dorsal scapular nerve.
- Rhomboid Major and Minor: Adduct and downwardly rotate the scapula; innervated by the dorsal scapular nerve.
- Latissimus Dorsi: Extends, adducts, and medially rotates the shoulder; originates from spinous processes of thoracic, lumbar, and sacral vertebrae, ribs 8-12; inserts at the intertubercular groove of the humerus.
- Teres Major: Extends, adducts, and internally rotates the shoulder; originates from the inferior angle of the scapula; inserts at the medial lip of the intertubercular sulcus; innervated by the lower subscapular nerve.
Muscles of the Rotator Cuff
- Supraspinatus: Abducts the shoulder; originates from the supraspinous fossa; inserts at the greater tubercle; innervated by the suprascapular nerve.
- Infraspinatus: Externally rotates the shoulder; originates from the infraspinous fossa; inserts at the greater tubercle; innervated by the suprascapular nerve.
- Teres Minor: Externally rotates and weakly adducts the shoulder; originates from the lateral border of the scapula; inserts at the greater tubercle; innervated by the axillary nerve.
- Subscapularis: Medially rotates the shoulder; originates from the subscapular fossa; inserts at the lesser tubercle; innervated by the upper and lower subscapular nerves.
Muscles of the Arm
- Biceps Brachii: Consists of short and long heads; primarily flexes the elbow and shoulder; innervated by the musculocutaneous nerve.
- Brachialis: Flexes the elbow; innervated by the musculocutaneous nerve.
- Triceps Brachii: Extends the elbow; innervated by the radial nerve.
- Anconeus: Assists with elbow extension; innervated by the radial nerve.
Muscles That Move the Forearm
- Include biceps brachii (short and long heads), triceps brachii (both heads), and brachialis.
Muscles That Move the Hand
- Flexor Carpi Radialis: Flexes and abducts the wrist; innervated by the median nerve.
- Palmaris Longus: Flexes at the wrist; innervated by the median nerve.
- Flexor Carpi Ulnaris: Flexes and adducts at the wrist; innervated by the ulnar nerve.
- Flexor Digitorum Superficialis: Flexes wrist and digits; innervated by the median nerve.
- Pronator Quadratus: Pronates the forearm; innervated by the median nerve.
Anterior and Posterior Muscles of the Forearm
- Superficial Anterior Muscles: Include pronator teres, flexor carpi radialis, palmaris longus, flexor carpi ulnaris, and flexor digitorum superficialis.
- Deep Anterior Muscles: Include flexor pollicis longus, flexor digitorum profundus, and pronator quadratus.
- Superficial Posterior Muscles: Include brachioradialis, extensor carpi radialis longus and brevis, extensor digitorum, extensor digiti minimi, and extensor carpi ulnaris.
- Deep Posterior Muscles: Include supinator, abductor pollicis longus, extensor pollicis brevis and longus, and extensor indicis.
Muscles of the Palm and Digits
- Thenar Muscles: Abductor pollicis brevis, flexor pollicis brevis, and opponens pollicis; all innervated by the recurrent branch of the median nerve.
- Hypothenar Muscles: Abductor digiti minimi, flexor digiti minimi brevis, and opponens digiti minimi; supplied by the ulnar nerve.
- Deep Muscles: Include adductor pollicis, palmar and dorsal interossei, and lumbricals; innervated by the ulnar nerve.
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Description
Test your knowledge on the muscles of the shoulder and their corresponding nerves. This quiz covers essential details about muscles such as the deltoid, pectoralis major, and trapezius. Perfect for anatomy students and enthusiasts aiming to strengthen their understanding of upper limb anatomy.
