Areas of distribution of the cutaneous branches of the posterior divisions of the spinal nerves. The areas of the medial branches are in black, those of the lateral in red.
Details
Identifiers
Latin
ramus posterior nervi spinalis
TA98
A14.2.00.035
TA2
6151
FMA
5983
Anatomical terms of neuroanatomy
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The dorsal ramus of spinal nerve, posterior ramus of spinal nerve, or posterior primary division is the posterior division of a spinal nerve. The dorsal rami provide motor innervation to the deep (a.k.a. intrinsic or true) muscles of the back, and sensory innervation to the skin of the posterior portion of the head, neck and back.[1]
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. In the neck and upper back, the medial branch is also responsible for providing sensory innervation of the skin; in the lower back, the lateral branch does so. All medial branches additionally also provide sensory innervation to the zygapophyseal joints and periosteum of the vertebral column.[1]
the dorsal rami. Shortly after a spinalnerve exits the intervertebral foramen, it branches into the dorsalramus, the ventral ramus, and the ramus communicans...
A spinalnerve is a mixed nerve, which carries motor, sensory, and autonomic signals between the spinal cord and the body. In the human body there are...
unexplained activation of the primary division of a posterior ramusof a spinalnerve (dorsalramusofspinalnerve). This nerve irritation causes referred...
The dorsal scapular nerve is a branch of the brachial plexus, usually derived from the ventral ramusof cervical nerve C5. It provides motor innervation...
occipital nerve is a nerveof the head. It is a spinalnerve, specifically the medial branch of the dorsal primary ramusof cervical spinalnerve 2. It arises...
The suboccipital nerve (first cervical dorsalramus) is the dorsal primary ramusof the first cervical nerve (C1). It exits the spinal cord between the...
fibers that arise from the merging of the anterior rami ofspinal nerves and blood vessels. There are five spinalnerve plexuses, except in the thoracic...
ramus communicans (pl.: rami communicantes) from Latin ramus (branch) and communicans (communicating) is the preganglionic sympathetic outflow nerve tract...
ulnar nerve. The ulnar branch (ramus ulnaris; posterior branch) passes obliquely downward on the medial side of the basilic vein, in front of the medial...
Each of these roots is the end of a spinalnerve connecting the spinal cord to the body. The vertebral column is divided into four groups of vertebrae:...
articulations of the carpal and metacarpal joints. Since the nerve passes dorsally around the head of the radius, it is susceptible to traction or compression...
the ventral rami of the lumbar and sacral spinal nerves with additional contributions from the subcostal nerve (T12) and coccygeal nerve (Co1). Based on...
ventral primary ramus via the dorsal scapular nerve (C5). Both rhomboid muscles also derive their arterial blood supply from the dorsal scapular artery...
addition to being attached to the fasciæ and the pubic ramus, the root is bound to the front of the pubic symphysis by the fundiform and suspensory ligaments...
L5 and S1 facet joint is innervated by the L4 medial branch nerve and the L5 dorsalramus. In this case, there is no L5 medial branch to innervate the...
nerve from the ganglion into the sympathetic trunk, move into a ventral ramus via a white ramus communicans, and finally move into the mixed spinal nerve...
branch. It crosses in front of the phrenic nerve and the scalene muscles, and in front of or between the divisions of the brachial plexus, and is covered by...
branches of cervical nerves branch from the dorsal rami of the cervical nerves. The posterior division of the first cervical or suboccipital nerve is larger...
muscle is innervated by the suboccipital nerve (the posterior ramusof cervical spinalnerve C1). The muscle acts to extend the head and rorate the head...
the greater horns of the hyoid bone. It then curves downward and forward, forming a loop which is crossed by the hypoglossal nerve. It then passes beneath...
medial to the superior costotransverse ligament, with the dorsalramusof a thoracic spinalnerve and associated vessels intervening between the two. Its...
called the lumbar medial branches of the dorsalramusof the spinal nerves. By generating heat around the nerve, the nerve is ablated, thus destroying its...
innervated by the suboccipital nerve (the posterior ramusof first cervical spinalnerve). The muscle acts as a weak extensor of the head. The rectus capitis...
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