Musculocutaneous Nerve Anatomy Notes PDF
Explain in detail about the Musculocutaneous Nerve under headings—origin, root value, course, branches, and innervation. Make a note on the injury to the nerve.
Answer:
Upper Limb Nerves – Musculocutaneous Nerve Essay
Musculocutaneous Nerve is the nerve of the front of the arm.
Musculocutaneous Nerve Origin
- Lateral cord of the brachial plexus in the axilla.
Musculocutaneous Nerve Root Value
- C5, C6, and C7 spinal segments.
Musculocutaneous Nerve Injury and Symptoms
Musculocutaneous Nerve Course
- From the lateral cord of the brachial plexus, it runs downwards and laterally pierces the coracobrachialis by supplying it.
- From there, it further descends downwards between the biceps brachii and brachialis muscles by innervating them.
- It reaches the lateral aspect of the biceps tendon to pierce the deep fascia just above the elbow joint.
- From there, it continues down as the lateral cutaneous nerve of the forearm.
Musculocutaneous Nerve Branches and Innervation
- Muscular branches supplying
- Biceps brachii
- Coracobrachialis
- Brachialis
- Cutaneous branch (lateral cutaneous nerve of the forearm)
- Supplies skin over the front and lateral aspect of the forearm.
- Articular branch
- To the elbow joint
Musculocutaneous Nerve Viva Questions and Answers
Musculocutaneous Nerve Clinical Anatomy
- Injury to the musculocutaneous nerve, though rare, can cause loss of
- Flexion of the elbow
- Biceps tendon reflex
- Loss of sensation over the lateral aspect of the forearm.