Neurology Exam Prep Podcast Episode 20: Peripheral Neuroanatomy of the Upper Limb
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Sep 3, 2020 Dive into the intricacies of upper limb neuroanatomy with insights on the brachial plexus and its role in arm and hand functionality. Discover the significance of cervical nerve roots and specialized conditions like upper trunk plexopathy and Erb's palsy. The discussion includes mnemonic aids for memorizing complex structures and highlights issues like post-operative plexitis. Uncover the importance of the supraspinatus muscle and the critical functions of the ulnar nerve, enhancing your understanding of anatomy while exploring clinical implications.
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Approach Peripheral Nerve Anatomy
- Use a proximal-to-distal approach to understand peripheral nerve anatomy starting at the spinal cord.
- Remember that nerve roots split into dorsal rami (innervate paraspinals) and ventral rami (form peripheral nerves).
Dorsal Root Ganglia Protection
- The dorsal root ganglia (DRG) is located distal to typical nerve impingement sites like disc herniation.
- This protects the DRG, allowing sensory nerves to appear normal on EMG despite radicular pain.
Memorize C5 to T1 Nerve Roots
- Focus on the nerve roots C5 through T1 when studying upper extremity innervation.
- Keep in mind prefixed (C4) or postfixed (T2) plexus variants exist but are less common.
