posterior root

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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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

posterior root

One of the two roots by which a spinal nerve is attached to the spinal cord; contains afferent nerve fibers.
See also: root
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
For example, in a recent series, 31 (68.9%) of 45 patients undergoing repair of the posterior root of the medial meniscus reported only minor trauma prior to presentation.
Comparison of clinical and radiologic results between partial meniscectomy and refixation of medial meniscus posterior root tears: a minimum 5-year follow-up.
Biomechanical consequences of a tear of the posterior root of the medial meniscus.
Biomechanical consequences of a posterior root tear of the lateral meniscus: stabilizing effect of the meniscofemoral ligament.
LaPrade, "Influence of lateral meniscal posterior root avulsions and the meniscofemoral ligaments on tibiofemoral contact mechanics," Knee Surgery, Sports Traumatology, Arthroscopy, vol.
Gu, "The effect of complete radial lateral meniscus posterior root tear on the knee contact mechanics: a finite element analysis," Journal of Orthopaedic Science, vol.
F Laprade, "Qualitative and quantitative anatomic analysis of the posterior root attachments of the medial and lateral menisci," American Journal of Sports Medicine, vol.
After fixation, the lumbar spinal cords with posterior roots were removed en bloc and each was dissected into three gross samples (A, B and C): the transverse section with lumbar spinal cord of L3 (sample A) for light microscopic examination and TUNEL staining (see TUNEL staining for apoptosis below), the posterior corner section of L3 (sample B), and the posterior roots section of L3 (sample C) for electron microscopic examination.
The histological changes were mainly observed in posterior roots and the adjacent posterior white matter.
Our experiments suggest that histological changes within the spinal cord after 48 hours exposure to ropivacaine are similar to those from lignocaine, the neuronal injury being mainly in the posterior roots and posterior white matter.

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