root

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.

root

(rūt), [TA]

1. The primary or beginning portion of any part, as of a nerve at its origin from the brainstem or spinal cord. Synonym(s): radix (1)

2. Synonym(s): root of tooth

3. The descending underground portion of a plant; it absorbs water and nutrients, provides support, and stores nutrients.

4. Loosely used to denote the etiology of a process, event, or conflict requiring solutions to allow mitigation. For roots of pharmacologic significance that are not listed below, see specific names.

[A.S. rot]

root

(rldbomact) 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.

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anterior root of spinal nerve  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.

Diagram of a horizontal section of the spinal cord, with posterior and anterior roots and a spinal nerve.

dorsal root of spinal nerve  posterior r. of spinal nerve.

motor root of spinal nerve  anterior r. of spinal nerve.

nerve roots  the series of paired bundles of nerve fibers that emerge at each side of the spinal cord, termed posterior (or dorsal) or anterior (or ventral) according to their position. There are 31 pairs (8 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 1 coccygeal), each corresponding posterior and anterior root joining to form a spinal nerve. Certain cranial nerves, e.g., the trigeminal, also have nerve roots.

posterior root of spinal nerve  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.

sensory root  posterior r. of spinal nerve.

ventral root of spinal nerve  anterior r. of spinal nerve.

root

(ro͞ot, ro͝ot)

n.

1. The embedded part of an organ or structure such as a hair, tooth, or nerve, that serves as a base or support.

2. A primary source; an origin; radix.

root

[ro̅o̅t, roo͡t]

Etymology: AS, rot

the lowest part of an organ or a structure by which something is firmly attached, such as the anatomical root of the tooth, which is covered by cementum. Also called (Latin) radix.

root

Australian slang for:
noun Sexual intercourse.
 
verb To engage in sexual intercourse.

root

(rūt) [TA]

1. The primary or beginning portion of any part, as of a nerve at its origin from the brainstem or spinal cord.
Synonym(s): radix (1) [TA] .

2. Synonym(s): root of tooth.

3. The descending underground portion of a plant; it absorbs water and nutrients, provides support, and stores nutrients.

[A.S. rot]

Fig. 271 Root. Transverse section of a typical dicotyledon (buttercup) root.

root

that part of a plant which (usually) grows below ground. The root provides anchorage for the aerial parts, absorbs water and mineral salts from the soil, conducts water and nutrients to other parts of the plant, and often stores food materials over winter. Root structure is variable among higher plants, but generally the root, unlike the young STEM, has a central core of conducting tissue (the STELE) which also serves as a strong structural element, assisting the root as it pushes downwards and resisting upward pressures from the aerial parts.

Roots can be classified into three main types: primary, secondary (see LATERAL ROOT), and ADVENTITIOUS (1). The primary root of ANGIOSPERMS develops from the radicle of the seedling. Later, secondary roots emerge from the top of the primary root and then further down. At the apex of the root is a protective ROOT CAP. The typical root structure of a DICOTYLEDON is shown in Fig. 271.

In MONOCOTYLEDONS the number of xylem ‘arms’ is usually much greater than in DICOTYLEDONS, 12 to 20 in monocotyledons, 2 to 5 in dicotyledons. Roots frequently undergo SECONDARY THICKENING in dicotyledons, but not in monocotyledons.

root

(rūt) [TA]

1. Primary or beginning portion of any part, as of a nerve at its origin from the brainstem or spinal cord.

2. Synonym(s): root of tooth.

3. Loosely used to denote the etiology of a process, event, or conflict requiring solutions to allow mitigation.

[A.S. rot]

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.

Patient discussion about root

Q. How much does a root canal hurt? I have to get a root canal for my bottom tooth. I was wondering how much they hurt. And do you have any suggestions that help distract from the pain? Thanks.

A. i did one about two years ago- even the injection wasn't too bad! didn't feel a thing. but after the anesthesia worn off it hurt. but then the dentist told me to take Advil or any other NSAID and it helped.