Nerve
Intercostal nerves
Anterior rami of T1-T11
High-yield
Run in the costal groove with the vein and artery (VAN, top to bottom); T4 nipple, T10 umbilicus dermatomes.
Overview
The anterior rami of the thoracic spinal nerves that run in the costal grooves to supply the thoracic and abdominal walls.
Reference facts
- Roots
- Anterior rami of T1-T11 (T12 = subcostal nerve)
- Course
- Run in the intercostal spaces within the costal groove between the internal and innermost intercostal muscles
- Motor
- Intercostal muscles and (lower nerves) the anterolateral abdominal wall muscles
- Sensory
- Skin and parietal pleura/peritoneum of the thoracic and abdominal walls (dermatomes)
Frequently asked questions
What are the roots of the intercostal nerves?
The intercostal nerves arises from anterior rami of T1-T11 (T12 = subcostal nerve).
What muscles does the intercostal nerves supply?
The intercostal nerves supplies the intercostal muscles and (lower nerves) the anterolateral abdominal wall muscles.
What is the sensory distribution of the intercostal nerves?
The intercostal nerves carries sensation from the skin and parietal pleura/peritoneum of the thoracic and abdominal walls (dermatomes).
What is the course of the intercostal nerves?
Run in the intercostal spaces within the costal groove between the internal and innermost intercostal muscles.