This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
Intercostal nerve is a branch of ? 
Select and explain. 
A. Brachial plexus, B. Dorsal rami of thoracic spinal nerves, C. Ventral rami of thoracic spinal nerves, D. Ventral rami of cervical spinal nerves
C: Ventral rami of thoracic spinal nerves
Answer: C: Ventral rami of thoracic spinal nerves 
Explanation: Ans. is 'c' i.e., Ventral rami of thoracic spinal nervesVentral rami of upper 11th thoracic spinal nerves are known as intercostal nerves and ventral ramus of T12 is known as subcostal nerve.Upper six intercostal nerves supply thoracic wall whereas lower five intercostal nerves and subcostal nerve supply thoracic and anterior abdominal walls and hence known as thoracoabdominal nerves. Upper two intercostal nerves also supply the upper limb.Thus only 3rd to 6th are called typical intercostal nerves.