Thoracic spinal nerve 8

The thoracic spinal nerve 8 (T8) is one of the twelve thoracic spinal nerves located in the thoracic region of the vertebral column. It emerges from the spinal cord between the eighth and ninth thoracic vertebrae (T8 and T9).

Anatomy

The thoracic spinal nerves are part of the peripheral nervous system and are responsible for transmitting signals between the spinal cord and the body. The T8 nerve is part of the thoracic segment of the spinal cord, which is located in the middle portion of the back.

Pathway

The T8 nerve exits the spinal column through the intervertebral foramen between the T8 and T9 vertebrae. It then travels along the rib cage, running between the internal and innermost intercostal muscles. The nerve continues anteriorly to innervate the muscles and skin of the thoracic and abdominal walls.

Branches

The primary branch of the T8 nerve is the intercostal nerve, which supplies the intercostal muscles that are involved in the mechanical aspect of breathing. The intercostal nerves also provide sensory innervation to the skin overlying the thorax and abdomen.

Function

The T8 nerve plays a crucial role in the motor and sensory innervation of the thoracic and upper abdominal regions. It contributes to the function of the intercostal muscles, which are essential for respiration. Additionally, it provides sensory input from the skin and deeper structures in its dermatome.

Clinical significance

Injury or compression of the T8 nerve can lead to pain, numbness, or weakness in the corresponding dermatome. Conditions such as herniated discs, spinal stenosis, or trauma can affect the function of the T8 nerve. Understanding the pathway and function of the T8 nerve is important in diagnosing and treating thoracic spinal nerve-related conditions.

Also see

• Thoracic spinal nerve 7
• Thoracic spinal nerve 9
• Intercostal nerves
• Spinal cord
• Vertebral column