Podcast
Questions and Answers
Which muscle in the arm is innervated by the radial nerve?
Which muscle in the arm is innervated by the radial nerve?
- Brachialis
- Triceps brachii (correct)
- Biceps brachii
- Coracobrachialis
In the forearm, the radial nerve innervates muscles located in which compartments?
In the forearm, the radial nerve innervates muscles located in which compartments?
- Flexor compartment only
- Anterior compartment only
- Superficial and deep extensor compartments (correct)
- Lateral and flexor compartments
Which of the following movements is primarily controlled by muscles innervated by the radial nerve?
Which of the following movements is primarily controlled by muscles innervated by the radial nerve?
- Wrist flexion
- Finger adduction
- Wrist extension (correct)
- Elbow flexion
Besides the extensor muscles, which other muscle in the forearm is innervated by the radial nerve and is located in the lateral compartment?
Besides the extensor muscles, which other muscle in the forearm is innervated by the radial nerve and is located in the lateral compartment?
What is the primary function of the brachioradialis muscle, which is innervated by the radial nerve?
What is the primary function of the brachioradialis muscle, which is innervated by the radial nerve?
The radial nerve innervates muscles responsible for extending which joints of digits 2, 3, and 4?
The radial nerve innervates muscles responsible for extending which joints of digits 2, 3, and 4?
Which of the following muscles is NOT innervated by the radial nerve?
Which of the following muscles is NOT innervated by the radial nerve?
A patient presents with an inability to extend their wrist and digits 2, 3, and 4 at the MP joints. Which nerve is MOST likely affected?
A patient presents with an inability to extend their wrist and digits 2, 3, and 4 at the MP joints. Which nerve is MOST likely affected?
Following a humeral fracture, a patient exhibits weakness in elbow extension and supination. Sensation is intact. Which specific branch of the radial nerve is MOST likely injured?
Following a humeral fracture, a patient exhibits weakness in elbow extension and supination. Sensation is intact. Which specific branch of the radial nerve is MOST likely injured?
A surgeon is performing a procedure near the lateral epicondyle of the humerus. Which nerve is at greatest risk of iatrogenic injury, potentially leading to weakness in wrist and finger extension, but preserving triceps function?
A surgeon is performing a procedure near the lateral epicondyle of the humerus. Which nerve is at greatest risk of iatrogenic injury, potentially leading to weakness in wrist and finger extension, but preserving triceps function?
Which nerve directly innervates the coracobrachialis muscle?
Which nerve directly innervates the coracobrachialis muscle?
Which of the following actions is NOT primarily associated with muscles innervated by the musculocutaneous nerve?
Which of the following actions is NOT primarily associated with muscles innervated by the musculocutaneous nerve?
Which muscles of the forearm are innervated by the ulnar nerve?
Which muscles of the forearm are innervated by the ulnar nerve?
Which of the following muscles is NOT innervated by the median nerve in the hand?
Which of the following muscles is NOT innervated by the median nerve in the hand?
Which of the following best describes the innervation pattern of the flexor digitorum profundus?
Which of the following best describes the innervation pattern of the flexor digitorum profundus?
Which of the following muscles is responsible for adducting the thumb?
Which of the following muscles is responsible for adducting the thumb?
A patient presents with weakness in wrist flexion and pronation, as well as difficulty flexing digits 1-5. Sensation is intact. Which nerve is MOST likely affected?
A patient presents with weakness in wrist flexion and pronation, as well as difficulty flexing digits 1-5. Sensation is intact. Which nerve is MOST likely affected?
Which of the following muscles is NOT located in the forearm?
Which of the following muscles is NOT located in the forearm?
Following a deep laceration to the anterior forearm, a patient is unable to flex their distal interphalangeal joints of the 4th and 5th digits. Which nerve has MOST likely been damaged?
Following a deep laceration to the anterior forearm, a patient is unable to flex their distal interphalangeal joints of the 4th and 5th digits. Which nerve has MOST likely been damaged?
A surgeon is performing a procedure in the cubital fossa and inadvertently severs a nerve. Post-operatively, the patient exhibits weakened elbow flexion when the forearm is supinated, but elbow flexion is relatively normal when the forearm is pronated. Which nerve was MOST likely injured?
A surgeon is performing a procedure in the cubital fossa and inadvertently severs a nerve. Post-operatively, the patient exhibits weakened elbow flexion when the forearm is supinated, but elbow flexion is relatively normal when the forearm is pronated. Which nerve was MOST likely injured?
Flashcards
Musculocutaneous Nerve Muscles
Musculocutaneous Nerve Muscles
Flexor compartment of the arm; flexes elbow and supinates forearm.
Ulnar Nerve Forearm Muscles
Ulnar Nerve Forearm Muscles
Flexor carpi ulnaris and ulnar half of flexor digitorum profundus (digits 4,5).
Ulnar Nerve Hand Muscles
Ulnar Nerve Hand Muscles
All intrinsic muscles except thenar muscles and lumbricals of digits 2 & 3.
Median Nerve Forearm Muscles
Median Nerve Forearm Muscles
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Median Nerve Hand Muscles
Median Nerve Hand Muscles
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Biceps Brachii Function & Innervation
Biceps Brachii Function & Innervation
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Coracobrachialis Function
Coracobrachialis Function
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Flexor Carpi Ulnaris Function & Innervation
Flexor Carpi Ulnaris Function & Innervation
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Flexor Digitorum Profundus Action & Innervation
Flexor Digitorum Profundus Action & Innervation
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Thenar Muscles Function and Innervation
Thenar Muscles Function and Innervation
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What area does the radial nerve innervate?
What area does the radial nerve innervate?
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Which arm muscles are innervated by radial n.?
Which arm muscles are innervated by radial n.?
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Name a specific arm muscle innervated by the radial nerve.
Name a specific arm muscle innervated by the radial nerve.
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Which forearm muscles are innervated by the radial nerve?
Which forearm muscles are innervated by the radial nerve?
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What movements do radial nerve-innervated muscles facilitate?
What movements do radial nerve-innervated muscles facilitate?
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Where is the supinator muscle located?
Where is the supinator muscle located?
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Besides the extensors where else does the radial n. innervate in the forearm?
Besides the extensors where else does the radial n. innervate in the forearm?
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What is the one muscle in the lateral compartment?
What is the one muscle in the lateral compartment?
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What is the function of the brachioradialis muscle?
What is the function of the brachioradialis muscle?
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Which muscle stabilizes the elbow and that is innervated by the radial nerve?
Which muscle stabilizes the elbow and that is innervated by the radial nerve?
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Study Notes
- The following are muscles and associated innervation in the upper limb
Muscles Innervated by the Musculocutaneous Nerve
- This nerve supplies the flexor compartment of the arm
- The flexor compartment muscles flex the elbow and supinate the forearm
- Muscles innervated include:
- Coracobrachialis
- Biceps brachii
- Brachialis
Muscles Innervated by the Ulnar Nerve
- This nerve innervates muscles of the forearm and hand
- In the forearm, the muscles innervated include:
- Flexor carpi ulnaris
- Ulnar (medial) half of flexor digitorum profundus (digits 4 and 5)
- In the hand, the muscles innervated include all the intrinsic muscles, except those of the thenar eminence
- And the Lumbricals of digits 2 and 3
Muscles Innervated by the Median Nerve
- This nerve innervates muscles of the forearm and hand
- In the forearm, the muscles innervated include all muscles of the superficial and deep flexor compartments, except flexor carpi ulnaris and the ulnar half of flexor digitorum profundus
- These muscles flex and pronate the wrist and flex all five digits
- In the hand, the muscles innervated include those of the thenar eminence and the lumbricals of digits 2 and 3
Muscles Innervated by the Radial Nerve
- This nerve supplies muscles in the arm and forearm
- In the arm, the muscles of the extensor compartment are innervated, which includes the triceps brachii
- In the forearm, the muscles of the superficial and deep extensor compartments are innervated
- These muscles extend the wrist, joints of the thumb, and MP joints of digits 2, 3, and 4
- This compartment also contains the supinator muscle
- The radial nerve also innervates the lateral compartment, consisting of one muscle, the brachioradialis
- This muscle stabilizes the elbow
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Description
Overview of muscles in the upper limb and their innervation. The musculocutaneous nerve innervates the flexor compartment of the arm. The ulnar nerve innervates muscles of the forearm and hand, and the median nerve innervates muscles of the forearm and hand.
