Podcast
Questions and Answers
Which nerve originates from the lateral cord of the brachial plexus?
Which nerve originates from the lateral cord of the brachial plexus?
- Median nerve
- Radial nerve
- Musculocutaneous nerve (correct)
- Ulnar nerve
Which muscle does NOT receive motor innervation from the musculocutaneous nerve?
Which muscle does NOT receive motor innervation from the musculocutaneous nerve?
- Pronator teres (correct)
- Biceps brachii
- Coracobrachialis
- Brachialis
What is the main sensory function of the musculocutaneous nerve?
What is the main sensory function of the musculocutaneous nerve?
- Sensory innervation of the anterior arm
- Sensory innervation of the medial forearm
- Sensory innervation of the skin of the lateral forearm (correct)
- Sensory innervation of the posterior arm
Which of the following statements about the median nerve is true?
Which of the following statements about the median nerve is true?
Palsy of the musculocutaneous nerve would likely result in which of the following symptoms?
Palsy of the musculocutaneous nerve would likely result in which of the following symptoms?
Which statement about the course of the median nerve is correct?
Which statement about the course of the median nerve is correct?
The sensory innervation provided by the median nerve does NOT include which area?
The sensory innervation provided by the median nerve does NOT include which area?
What is the primary motor function of the musculocutaneous nerve?
What is the primary motor function of the musculocutaneous nerve?
Which nerve primarily supplies the skin on the lateral surface of the forearm?
Which nerve primarily supplies the skin on the lateral surface of the forearm?
The loss of sensation on the lateral surface of the forearm is associated with damage to which nerve?
The loss of sensation on the lateral surface of the forearm is associated with damage to which nerve?
Which statement best describes the course of the median nerve?
Which statement best describes the course of the median nerve?
In which condition would you expect atrophy of the anterior muscles of the arm?
In which condition would you expect atrophy of the anterior muscles of the arm?
What is an essential feature of the median nerve's innervation in the arm?
What is an essential feature of the median nerve's innervation in the arm?
Which nerve is formed by the union of lateral and medial roots?
Which nerve is formed by the union of lateral and medial roots?
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Study Notes
Musculocutaneous Nerve
- Originates from the lateral cord of the brachial plexus.
- Pierces through the bellies of the coracobrachialis, biceps brachii, and brachialis muscles.
- Innervates muscles in the anterior compartment of the arm.
- Terminates as the lateral cutaneous nerve of the forearm.
- Motor innervation includes:
- Coracobrachialis
- Biceps brachii
- Brachialis
- Sensory innervation covers the skin on the lateral side of the forearm.
- Symptoms of musculocutaneous nerve palsy:
- Atrophy of anterior arm muscles.
- Impaired flexion at the elbow and forearm supination.
- Loss of sensation on the lateral forearm.
Median Nerve - Brachial Section
- Formed by the union of two roots: lateral root (C6, C7) from the lateral cord and medial root (C8, T1) from the medial cord of the brachial plexus.
- In arm, the median nerve runs alongside the biceps brachii in the medial bicipital groove, adjacent to the brachial artery.
- Enters the cubital fossa covered by the bicipital aponeurosis.
- Passes into the anterior compartment of the forearm without branching in the arm.
- Supplies the elbow joint capsule.
Musculocutaneous Nerve
- Originates from the lateral cord of the brachial plexus.
- Pierces through the bellies of the coracobrachialis, biceps brachii, and brachialis muscles.
- Innervates muscles in the anterior compartment of the arm.
- Terminates as the lateral cutaneous nerve of the forearm.
- Motor innervation includes:
- Coracobrachialis
- Biceps brachii
- Brachialis
- Sensory innervation covers the skin on the lateral side of the forearm.
- Symptoms of musculocutaneous nerve palsy:
- Atrophy of anterior arm muscles.
- Impaired flexion at the elbow and forearm supination.
- Loss of sensation on the lateral forearm.
Median Nerve - Brachial Section
- Formed by the union of two roots: lateral root (C6, C7) from the lateral cord and medial root (C8, T1) from the medial cord of the brachial plexus.
- In arm, the median nerve runs alongside the biceps brachii in the medial bicipital groove, adjacent to the brachial artery.
- Enters the cubital fossa covered by the bicipital aponeurosis.
- Passes into the anterior compartment of the forearm without branching in the arm.
- Supplies the elbow joint capsule.
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