What is the motor distribution of the musculocutaneous nerve?
The musculocutaneous nerve innervates the three muscles of the anterior compartment of the arm: the coracobrachialis, biceps brachii, and brachialis. It is also responsible for cutaneous innervation of the lateral forearm.
Is the musculocutaneous nerve sensory or motor?
The musculocutaneous nerve is a mixed motor and sensory nerve. It arises from the lateral cord of the brachial plexus and receives contributions from C5–C7 cervical roots.
What happens when musculocutaneous nerve is damaged?
Damage to this nerve can result in problems with the tissues in innervates, including: Loss of sensation in the skin on the front side of the forearm. Weakened flexion at the shoulder and elbow. Weakened rotation of the arm.
Why is musculocutaneous nerve called Musculocutaneous?
The Musculocutaneous nerve is a large branch of the Brachial Plexus.It is called musculocutaneous nerve as it supplies the muscles of the front of the arm and skin of lateral side of forearm.
What does the musculocutaneous nerve become?
It then continues as the lateral cutaneous nerve of the forearm. The musculocutaneous nerve terminates as the lateral cutaneous nerve of the forearm that supplies the anterolateral skin of the forearm.
Why is musculocutaneous nerve called so?
What is Musculocutaneous neuropathy?
Introduction. Isolated injury to the musculocutaneous nerve is a rare occurrence. Associated signs and symptoms of an isolated musculocutaneous neuropathy may include weakness in elbow flexion or shoulder flexion, atrophy of the biceps brachii, and pain or paresthesia at the lateral forearm.
What Innervates the musculocutaneous nerve?
Those with this type of lesion is presented with pain, reduced sensation, and tingling of the lateral part of forearm (lateral antebrachial cutaneous nerve – terminal sensory only branch of Musculocutaneous nerve) with reduced strength of elbow flexion. Tinel’s sign can be positive.
What is Musculocutaneous Junction?
The musculocutaneous nerve arises from the lateral cord of the brachial plexus, courses through the anterior part of the arm, and terminates at 2 cm above elbow as the lateral cutaneous nerve of the forearm. Besides, the musculocutaneous nerve also gives articular branches to the elbow joint and to the humerus.
Where does the musculocutaneous nerve start and end?
The musculocutaneous nerve arises from the lateral cord of the brachial plexus, courses through the anterior part of the arm, and terminates at 2 cm above elbow as the lateral cutaneous nerve of the forearm.
Is the musculocutaneous nerve a motor or sensory nerve?
The musculocutaneous nerve is a major peripheral nerve of the upper limb. In this article, we shall look at the anatomy of the musculocutaneous nerve – its anatomical course, motor and sensory functions, and its clinical correlations.
Where is the terminal branch of the musculocutaneous nerve?
The musculocutaneous nerve is the terminal branch of the lateral cord of the brachial plexus (C5, C6 and C7) and emerges at the inferior border of pectoralis minor muscle. It leaves the axilla and pierces the coracobrachialis muscle near its point of insertion on the humerus.
What causes a stab wound to the musculocutaneous nerve?
Clinical Relevance: Musculocutaneous Nerve Lesion. Mechanism of injury – injury to the musculocutaneous nerve is relatively uncommon, as it is well protected within the axilla. The most common cause is a stab wound to the axilla region. Motor functions – coracobrachialis, biceps brachii and brachialis muscles are paralysed.
What can be done for musculocutaneous nerve damage?
Many cases can be treated conservatively, such as with rest, ice, anti-inflammatory medications, and physical therapy. However, if that approach isn’t successful, surgical decompression may become necessary. In some cases, nerve grafting or nerve transfer may be necessary for restoring function. 7