dorsal root

dorsal root

n.

The sensory root of a spinal nerve. Also called posterior root.

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dorsal root

Etymology: L, dorsalis, back; AS, rot

the sensory component or posterior root of a spinal nerve, attached centrally to the spinal cord.

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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.

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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

see endodontics.

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.

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dorsal root

 Posterior root, see there