Thoracic Nerves (Intercostal + Subcostal) | Anatomy

Content:
0:00 Introduction
01:50 Content
02:13 Intercostal Nerve Course
04:52 Intercostal Nerve Branches
08:30 Typical vs. Atypical Intercostal Nerves
12:30 Subcostal Nerve

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Intro:
- Intercostal Spaces (spatium intercostale)

Intercostal Nerves (nervi intercostales):
- Typical Intercostal nerve
○ Muscular branches (rami musculares)
○ Somatosensory Branches
§ Lateral cutaneous branches (rami cutanei laterales)
§ Anterior cutaneous branches (rami cutanei anteriores)
§ Collateral branch
- Atypical Intercostal Nerve
○ 1st Nerve:
§ Superior branch joins brachial plexus
§ Inferior branch continues as intercostal nerve
○ 2nd intercostal nerve
§ Has Intercostobrachial nerve (nervi intercostobrachiales)
○ 7th, 8th, 9th, 10th, 11th Intercostal nerves
§ Also called thoracoabdominal nerves
§ Innervate abdominal wall
- Run in a neurovascular bundle

Subcostal Nerve (nervus subcostalis)
- Has the same branches as the intercostal nerves.
- Give off a communicating branch that helps form iliohypogastric nerve of the lumbar plexus