Podcast
Questions and Answers
Which nerve innervates the muscles in the anterior compartment of the arm?
Which nerve innervates the muscles in the anterior compartment of the arm?
Which muscle is responsible for adduction of the arm at the shoulder joint?
Which muscle is responsible for adduction of the arm at the shoulder joint?
Which head of the triceps brachii muscle crosses the shoulder joint?
Which head of the triceps brachii muscle crosses the shoulder joint?
Which nerve innervates the triceps brachii muscle?
Which nerve innervates the triceps brachii muscle?
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Which muscle originates from the coracoid process of the scapula?
Which muscle originates from the coracoid process of the scapula?
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Which muscle is responsible for supination of the forearm?
Which muscle is responsible for supination of the forearm?
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Which muscle is most active during flexion of arm with forearm in mid-pronation?
Which muscle is most active during flexion of arm with forearm in mid-pronation?
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Which muscle has its origin from the supraglenoid tubercle of the scapula?
Which muscle has its origin from the supraglenoid tubercle of the scapula?
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Which muscle has its insertion at the radial tuberosity and fascia of the forearm?
Which muscle has its insertion at the radial tuberosity and fascia of the forearm?
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Which nerve innervates the pronator teres, flexor carpi radialis, and palmaris longus muscles?
Which nerve innervates the pronator teres, flexor carpi radialis, and palmaris longus muscles?
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What is the function of the flexor digitorum superficialis (FDS) muscle?
What is the function of the flexor digitorum superficialis (FDS) muscle?
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Which nerve innervates the flexor pollicis longus and pronator quadratus muscles?
Which nerve innervates the flexor pollicis longus and pronator quadratus muscles?
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Which nerve innervates the extensor carpi radialis longus and brevis muscles?
Which nerve innervates the extensor carpi radialis longus and brevis muscles?
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Which nerve innervates the flexor digitorum profundus?
Which nerve innervates the flexor digitorum profundus?
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What is the function of the brachioradialis muscle?
What is the function of the brachioradialis muscle?
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If a patient injures the musculocutaneous nerve, will they still be able to perform flexion at the forearm?
If a patient injures the musculocutaneous nerve, will they still be able to perform flexion at the forearm?
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Which nerve innervates the extensor indicis muscle?
Which nerve innervates the extensor indicis muscle?
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What is the innervation of the anconeus muscle?
What is the innervation of the anconeus muscle?
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Which nerve innervates the Flexor Carpi Ulnaris?
Which nerve innervates the Flexor Carpi Ulnaris?
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What is the origin of the Flexor Carpi Radialis?
What is the origin of the Flexor Carpi Radialis?
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Which muscle is absent in 12-20% of the population?
Which muscle is absent in 12-20% of the population?
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What is the insertion of Pronator Teres?
What is the insertion of Pronator Teres?
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Which nerve is responsible for the flexion of the forearm by the Flexor Carpi Radialis?
Which nerve is responsible for the flexion of the forearm by the Flexor Carpi Radialis?
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What is the function of the Flexor Digitorum Profundus muscle?
What is the function of the Flexor Digitorum Profundus muscle?
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Which nerve innervates the Flexor Digitorum Profundus muscle for the medial half of the muscle?
Which nerve innervates the Flexor Digitorum Profundus muscle for the medial half of the muscle?
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What is the insertion point of the Flexor Pollicis Longus muscle?
What is the insertion point of the Flexor Pollicis Longus muscle?
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Which muscle is responsible for the pronation of the forearm?
Which muscle is responsible for the pronation of the forearm?
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Which nerve is responsible for the innervation of Pronator Quadratus?
Which nerve is responsible for the innervation of Pronator Quadratus?
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There is only one muscle responsible for pronation of forearm
There is only one muscle responsible for pronation of forearm
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_____ is the only muscle in the forearm compartment that is innervated by 2 nerves
_____ is the only muscle in the forearm compartment that is innervated by 2 nerves
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Which of the following muscles has tendons that pass through carpal tunnel?
Which of the following muscles has tendons that pass through carpal tunnel?
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Brachioradialis is innervated by....
Brachioradialis is innervated by....
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Which of the following is the insertion of pronator quadratus?
Which of the following is the insertion of pronator quadratus?
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Which of the following forms the carpal tunnel along with the concavity created by carpal bones?
Which of the following forms the carpal tunnel along with the concavity created by carpal bones?
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Synovial sheaths reduce _____ between the tendons of forearm muscles and underlying bones of the wrist.
Synovial sheaths reduce _____ between the tendons of forearm muscles and underlying bones of the wrist.
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The common extensor tendon lies at the ______ epicondyle of humerus
The common extensor tendon lies at the ______ epicondyle of humerus
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The common flexor tendon lies at the _____ epicondyle of the humerus
The common flexor tendon lies at the _____ epicondyle of the humerus
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Which of these muscles has an origin on the coronoid process of ulna?
Which of these muscles has an origin on the coronoid process of ulna?
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Which of these muscles has 3 different origins?
Which of these muscles has 3 different origins?
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Which of these muscles can perform adduction of the hand? (ulnar deviation)
Which of these muscles can perform adduction of the hand? (ulnar deviation)
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The ulnar nerve travels between the the two heads of ______ (a muscle)
The ulnar nerve travels between the the two heads of ______ (a muscle)
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Study Notes
Arm Muscles and Innervation
- The musculocutaneous nerve innervates the muscles in the anterior compartment of the arm.
- The pectoralis major muscle is responsible for adduction of the arm at the shoulder joint.
- The long head of the triceps brachii muscle crosses the shoulder joint.
- The radial nerve innervates the triceps brachii muscle.
- The coracobrachialis muscle originates from the coracoid process of the scapula.
Forearm Muscles and Functions
- The biceps brachii and supinator muscles are primarily responsible for the supination of the forearm.
- The biceps brachii is most active during flexion of the arm with the forearm in mid-pronation.
- The biceps brachii has its origin from the supraglenoid tubercle of the scapula.
- The biceps brachii inserts at the radial tuberosity and the fascia of the forearm.
Nerve Innervation of Forearm Muscles
- The median nerve innervates the pronator teres, flexor carpi radialis, and palmaris longus muscles.
- The flexor digitorum superficialis (FDS) muscle functions to flex the middle phalanges of the fingers.
- The anterior interosseous branch of the median nerve innervates the flexor pollicis longus and pronator quadratus muscles.
- The radial nerve innervates the extensor carpi radialis longus and brevis muscles.
- The median nerve innervates the flexor digitorum profundus muscle for the lateral half; the ulnar nerve innervates it for the medial half.
Functional Overview of Specific Muscles
- The brachioradialis muscle functions to flex the forearm, especially in the mid-pronated position.
- An injury to the musculocutaneous nerve may limit the ability to perform flexion at the forearm due to affected biceps brachii.
- The radial nerve innervates the extensor indicis muscle.
- The anconeus muscle is also innervated by the radial nerve.
- The ulnar nerve innervates the flexor carpi ulnaris.
Additional Notes on Muscle Origins and Insertions
- The flexor carpi radialis originates from the medial epicondyle of the humerus.
- The pronator teres muscle inserts at the mid-shaft of the radius.
- The flexor digitorum profundus muscle is responsible for flexing the distal phalanges.
- The pronator quadratus muscle is innervated by the anterior interosseous branch of the median nerve.
- The palmaris longus tendon can be absent in 12-20% of the population.
Special Muscle Features
- The pronator teres has its tendons passing through the carpal tunnel along with other structures.
- The common extensor tendon lies at the lateral epicondyle of the humerus.
- The common flexor tendon lies at the medial epicondyle of the humerus.
- The flexor carpi ulnaris travels between the two heads of the flexor carpi ulnaris muscle.
Miscellaneous
- Synovial sheaths reduce friction between tendons of forearm muscles and underlying wrist bones.
- The only muscle responsible for pronation of the forearm is the pronator teres, while the pronator quadratus assists.
- The flexor pollicis longus muscle inserts at the base of the distal phalanx of the thumb.
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Description
Test your knowledge of the upper limb compartments, arm muscles, and arm compartments with this quiz. Explore the divisions into anterior and posterior compartments and the muscles occupying them, including their functions and innervation.
