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Generally speaking, the anterior/ventral ramus innervates the skin and muscle on the anterior aspect of the trunk, while the posterior/dorsal ramus innervates the post-vertebral muscles and the skin of the back.
The ventral ramus (pl.: rami) (Latin for 'branch') is the anterior division of a spinal nerve. The ventral rami supply the antero-lateral parts of the trunk and the limbs. They are mainly larger than the dorsal rami.
The dorsal and ventral rami contain nerves that provide visceral motor, somatic motor, and sensory information, with the dorsal ramus feeding the dorsal trunk (skin and muscles of the back), and the ventral ramus feeding the ventral trunk and limbs through the ventrolateral surface.
A spinal nerve splits within the intervertebral foramen to form a dorsal ramus and a ventral ramus. The dorsal ramus then turns to course posterior-ward before splitting into a medial branch and a lateral branch. Both these branches provide motor innervation to deep back muscles.
The ventral and dorsal nerve roots exiting a cross section of spinal cord fuse together to form a spinal nerve, which then splits into the dorsal and ventral rami. The white and gray ramus form the rami communicantes that connect spinal nerves to autonomic ganglia.
Meanwhile, ventral rami are much more robust in size and function in comparison to their dorsal counterpart. The ventral rami provide the spinal contributions to all major neural plexuses. As such, they are responsible for the majority of the body’s sensorimotor innervation.
The spinal nerve is a mixed nerve, containing both sensory and motor fibers. Dorsal Ramus: Supplies the muscles and skin of the back. Ventral Ramus: Forms the major nerves of the limbs and front of the body, and contributes to nerve plexuses like the brachial, lumbar, and sacral plexuses.
The spinal nerves are quite short. Lateral to the vertebral column the nerve fibers split and head to different locations in the body via the rami: those traveling in the posterior (dorsal) ramus serve the muscles and skin of the posterior trunk, those in the larger anterior (ventral) ramus travel either to the anterolateral trunk or to the ...
Each spinal nerve is formed by the combination of nerve fibers from the dorsal and ventral roots of the spinal cord. The dorsal roots carry afferent sensory axons; The ventral roots carry efferent motor axons.
Introduction. The relevant anatomy of the innervation of the musculature of the back by the spinal nerves is centered around the lumbar spinal nerves, peripheral nerves of the lumbar plexus, spinal cord, and lumbar vertebral column. In general, the spinal cord consists of gray and white matter.