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Questions and Answers
Which nerve innervates the Flexor carpi ulnaris?
Which muscle is innervated by the anterior interosseous nerve?
Which of the following muscles is innervated by the deep radial nerve?
The Extensor pollicis longus is innervated by which nerve?
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Which muscle is NOT innervated by the median nerve?
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Which nerve innervates the Anconeus muscle?
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Which muscle is innervated by both the anterior interosseous nerve and the ulnar nerve?
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The Extensor carpi radialis brevis is innervated by which nerve?
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Which nerve does NOT innervate a muscle in the forearm?
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Which of the following muscles is solely innervated by the ulnar nerve?
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Which muscle is innervated by the anterior interosseous nerve?
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Which muscle is innervated by the anterior interosseous nerve?
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Which of the following muscles is NOT innervated by the median nerve?
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Which muscle is innervated solely by the radial nerve?
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Which of the following muscles is innervated by both the median nerve and the ulnar nerve?
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Which muscle is innervated by the deep radial nerve?
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Which nerve is responsible for innervating the Extensor Digitorum?
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Which of the following muscles is primarily controlled by the ulnar nerve?
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Study Notes
Innervation of Forearm Muscles
- Pronator teres: Innervated by the median nerve, crucial for pronation of the forearm.
- Flexor carpi radialis: Also innervated by the median nerve, assists in wrist flexion and abduction.
- Palmaris longus: Innervated by the median nerve, aids in flexing the wrist.
- Flexor carpi ulnaris: Innervated by the ulnar nerve, responsible for wrist flexion and adduction.
- Flexor digitorum superficialis: Innervated by the median nerve, involved in flexing the proximal interphalangeal joints of the fingers.
- Flexor digitorum profundus: Innervated by both the anterior interosseous nerve and the ulnar nerve, enables flexion of the distal interphalangeal joints.
- Pronator quadratus: Innervated by the anterior interosseous nerve, assists in pronation of the forearm.
- Flexor pollicis longus: Innervated by the anterior interosseous nerve, facilitates thumb flexion.
Innervation of Posterior Forearm Muscles
- Anconeus: Innervated by the radial nerve, assists in elbow extension.
- Brachioradialis: Also innervated by the radial nerve, involved in flexing the forearm at the elbow.
- Extensor carpi radialis longus: Innervated by the radial nerve, responsible for wrist extension and abduction.
- Extensor carpi radialis brevis: Innervated by the deep radial nerve, aids in wrist extension.
- Supinator: Innervated by the deep radial nerve, assists in supination of the forearm.
- Extensor digitorum: Innervated by the posterior interosseous nerve, extends the fingers.
- Extensor digiti minimi: Innervated by the posterior interosseous nerve, extends the little finger.
- Extensor carpi ulnaris: Innervated by the posterior interosseous nerve, contributes to wrist extension and adduction.
- Extensor indicis: Innervated by the posterior interosseous nerve, extends the index finger.
- Abductor pollicis longus: Innervated by the posterior interosseous nerve, allows for thumb abduction.
- Extensor pollicis brevis: Innervated by the posterior interosseous nerve, extends the thumb at the metacarpophalangeal joint.
- Extensor pollicis longus: Innervated by the posterior interosseous nerve, extends the thumb at the interphalangeal joint.
Median Nerve Innervation
- Innervates several anterior forearm muscles crucial for wrist and finger flexion.
- Key muscles include:
- Pronator teres: Assists in pronation of the forearm.
- Flexor carpi radialis: Flexes and abducts the wrist.
- Palmaris longus: Tenses the palmar fascia, aiding grip.
- Flexor carpi ulnaris: Flexes and adducts the wrist.
- Flexor digitorum superficialis: Flexes the middle phalanges of the fingers.
Ulnar Nerve Innervation
- Primarily innervates muscles involved in fine motor control and finger coordination.
- Main muscle innervated:
- Flexor digitorum profundus (ulnar half): Flexes the distal phalanges of the ring and little fingers.
Anterior Interosseous Nerve Innervation
- A branch of the median nerve that innervates deeper forearm muscles.
- Key muscles include:
- Pronator quadratus: Pronates the forearm effectively.
- Flexor pollicis longus: Flexes the thumb, contributing to grip strength.
Radial Nerve Innervation
- While not detailed in the provided information, the radial nerve typically innervates muscles responsible for elbow extension, wrist extension, and forearm supination.
Muscles of the Forearm Innervation Overview
- Median Nerve innervates several key muscles responsible for flexion in the forearm and hand, enhancing grip and manipulation.
- Key muscles innervated by the median nerve include:
- Pronator Teres - facilitates pronation of the forearm.
- Flexor Carpi Radialis - aids in wrist flexion and radial deviation.
- Palmaris Longus - assists in wrist flexion and tension of the palmar aponeurosis.
- Flexor Carpi Ulnaris - involved in wrist flexion and ulnar deviation.
- Flexor Digitorum Superficialis - flexes the middle phalanges of the fingers.
- Flexor Digitorum Profundus - primarily flexes the distal phalanges; partly operates under the ulnar nerve for the ring and little fingers.
- Pronator Quadratus - stabilizes the distal radioulnar joint and pronates the forearm.
- Flexor Pollicis Longus - moves the thumb by flexing its phalanx.
Radial Nerve Innervation
- Radial Nerve is crucial for extending the forearm and wrist, primarily innervating the posterior compartment.
- Key muscles innervated by the radial nerve include:
- Anconeus - assists in elbow extension.
- Brachioradialis - helps flex the forearm, particularly in a neutral position.
- Extensor Carpi Radialis Longus - extends and abducts the wrist.
- Extensor Carpi Radialis Brevis - extends the wrist and stabilizes it during grip.
- Supinator - supinates the forearm.
Specific Nerves and their Muscle Connections
-
Deep Radial Nerve branches from the radial nerve and innervates:
- Extensor Carpi Radialis Brevis - also involved in wrist extension.
- Supinator - responsible for supinating the forearm.
-
Posterior Interosseous Nerve, a branch of the deep radial nerve, innervates:
- Extensor Digitoris - extends the fingers, playing a key role in hand function.
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Description
Test your knowledge on the muscles of the forearm and their nerve innervations. This quiz covers key muscles such as the pronator teres and flexor carpi radialis. Determine which nerves are responsible for the function of each muscle listed.
