Ventral ramus of spinal nerve

Ventral Ramus of Spinal Nerve

The ventral ramus of spinal nerve is a branch of a spinal nerve that supplies the anterolateral parts of the trunk and the limbs. These rami are larger than the dorsal rami and are responsible for the innervation of the muscles and skin of the anterior and lateral trunk, as well as the limbs.

Structure

Each spinal nerve divides into a dorsal and a ventral ramus. The ventral rami are the anterior divisions of the spinal nerves. They are responsible for forming the major nerve plexuses, such as the cervical plexus, brachial plexus, lumbar plexus, and sacral plexus.

The ventral rami of the thoracic spinal nerves, however, do not form plexuses. Instead, they continue as the intercostal nerves, which run along the ribs and supply the muscles and skin of the thoracic and abdominal walls.

Function

The ventral rami carry both motor and sensory fibers. They provide motor innervation to the muscles of the anterior and lateral trunk and the limbs. They also carry sensory information from the skin of these regions back to the central nervous system.

Clinical Significance

Injuries to the ventral rami can result in loss of motor function and sensation in the areas they supply. Conditions such as herniated discs can compress these nerves, leading to pain, weakness, or numbness in the affected regions.

Images

Diagram of a spinal nerve, showing the ventral ramus.

Related Pages

• Dorsal ramus of spinal nerve
• Spinal nerve
• Nerve plexus

References

• Moore, K. L., Dalley, A. F., & Agur, A. M. R. (2013). Clinically Oriented Anatomy. Lippincott Williams & Wilkins.
• Standring, S. (2015). Gray's Anatomy: The Anatomical Basis of Clinical Practice. Elsevier Health Sciences.