dorsal root

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Related to Dorsal roots: ventral root, Posterior roots to the spinal cord

root

 [roōt]
1. the descending and subterranean part of a plant.
2. that portion of an organ, such as a tooth, hair, or nail, that is buried in the tissues, or by which it arises from another structure, or the part of a nerve that is adjacent to the center to which it is connected.
Tooth anomalies with variations in root form. From Darby and Walsh, 1994.
anterior root the anterior, or motor, division of each spinal nerve, attached centrally to the spinal cord and joining peripherally with the posterior root to form the nerve before it emerges from the intervertebral foramen; it conveys motor fibers to skeletal muscle and contains preganglionic autonomic fibers at the thoracolumbar and sacral levels. Called also ventral root.
dorsal root posterior root.
motor root anterior root.
nerve r's the series of paired bundles of nerve fibers which emerge at each side of the spinal cord, termed dorsal (or posterior) or ventral (or anterior) according to their position. There are 31 pairs (8 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 1 coccygeal), each corresponding dorsal and ventral root joining to form a spinal nerve. Certain cranial nerves, e.g., the trigeminal, also have nerve roots.
posterior root the posterior, or sensory, division of each spinal nerve, attached centrally to the spinal cord and joining peripherally with the anterior root to form the nerve before it emerges from the intervertebral foramen; each posterior root bears a spinal ganglion that conveys sensory fibers to the spinal cord. Called also dorsal root.
sensory root posterior root.
ventral root anterior root.

dorsal root

n.
Either of the two roots of a spinal nerve, consisting of sensory fibers and arising from the posterior section of the spinal cord.

dorsal root

Etymology: L, dorsalis, back; AS, rot
the sensory component or posterior root of a spinal nerve, attached centrally to the spinal cord.

dorsal root

 Posterior root, see there.

dor·sal root

(dōr'săl rūt)
The sensory root of a spinal nerve, having a dorsal root ganglion containing the nerve cell bodies of the fibers conveyed by the root in its distal end.

dorsal root

a nerve trunk containing only sensory axons, that enters the SPINAL CORD near the dorsal surface.

root

1. the descending and subterranean part of a plant.
2. that portion of an organ, such as a tooth, hair or nail, that is buried in the tissues, or by which it arises from another structure, or the part of a nerve that is adjacent to the center to which it is connected, e.g. root of neck, root of tail.

calcified root canal
restriction of the diameter of the root canal due to calicification; seen in older animals.
root canal
that part of the dental pulp cavity extending from the pulp chamber to the apical foramen. Called also pulp canal.
root canal therapy
dental root elevator
screwdriver-shaped instrument with a grooved and beveled blade. By pushing the tip of the blade between the tooth root and the alveolar wall the periodontal membrane is broken and the root is elevated and removed.
dorsal root
the sensory division of each spinal nerve, attached centrally to the spinal cord and joining peripherally with the ventral root to form the nerve before it emerges from the intervertebral foramen.
hair root
the part of the hair buried in the hair follicle.
mesenteric root
the small area of attachment of the mesentery to the dorsal abdominal wall at about the level of the first lumbar vertebrae. It encloses the vessels and nerves that supply the intestine.
motor root
ventral root.
nerve r's
the series of paired bundles of nerve fibers which emerge at each side of the spinal cord, termed dorsal (or posterior) or ventral (or anterior) according to their position. A series of dorsal and ventral roots join to form a spinal nerve. Certain cranial nerves, e.g. the trigeminal, also have nerve roots.
penis root
the attachment of the penis by two crura to the lateral parts of the ischial arch.
root perforation
an accidental occurrence when filing a root canal.
root planing
see dental planing.
sensory root
dorsal root.
root signature
referred pain down a limb, causing lameness or elevation of the limb, resulting from entrapment of the spinal nerve, usually by an extruded intervertebral disk.
root sheath cuticle
single layer of cornified cells of the hair follicle interdigitating with the cornified cells of the hair cuticle.
tongue root
caudal part of the tongue attached to the hyoid bone, soft palate and pharynx.
ventral root
the motor division of each spinal nerve, attached centrally to the spinal cord and joining peripherally with the dorsal root to form the nerve before it emerges from the intervertebral foramen.