WordNet

plant by the roots
(botany) the usually underground organ that lacks buds or leaves or nodes; absorbs water and mineral salts; usually it anchors the plant to the ground
a number that, when multiplied by itself some number of times, equals a given number
cause to take roots
take root and begin to grow; "this plant roots quickly"
(linguistics) the form of a word after all affixes are removed; "thematic vowels are part of the stem" (同)root word, base, stem, theme, radical
the part of a tooth that is embedded in the jaw and serves as support (同)tooth_root
come into existence, originate; "The problem roots in her depression"
toward or on or near the belly (front of a primate or lower surface of a lower animal); "the ventral aspect of the human body"; "the liver is somewhat ventral in position"; "ventral (or pelvic) fins correspond to the hind limbs of a quadruped"
the condition of belonging to a particular place or group by virtue of social or ethnic or cultural lineage; "his roots in Texas go back a long way"; "he went back to Sweden to search for his roots"; "his music has African roots"
the process of putting forth roots and beginning to grow

PrepTutorEJDIC

《しばしば複数形で》『根』 / 『根元』 / 《the~》『根源』,根本;根底 / 《複数形で》(その人の根底にある)ある場所との根源的なつながり / (数学で)根,ルート / (派生語の)語根(例えばrootlessの中のroot) / 〈植物〉‘を'『根づかせる』 / 《しばしば受動態で》(根をおろしたように)(…に)…‘を'『定着させる』『+『名』+『to』(『in』)+『名』》 / (…に)『根を下ろす』,定着する《+『in』(『on』,『to』)+『名』》
〈豚などが〉(…をあさって)鼻で地面を掘る《+『about』(『around』)『for』+『名』》 / (…を捜して)〈人が〉かき回す《+『about for』+『名』》
(…を)声援する,(…の)成功を願う《+『for』+『名』》
腹の,腹部の
《補語にのみ用いて》(植物が)根づいた / (考えなどが)定着した

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2013/05/14 08:57:08」(JST)

In anatomy and neurology, the ventral root (or anterior root) is the efferent motor root of a spinal nerve.

At its distal end, the ventral root joins with the dorsal root to form a mixed spinal nerve.

Cervical vertebra
Medulla spinalis
A spinal nerve with its anterior and posterior.
The motor tract.
Diagrammatic transverse section of the medulla spinalis and its membranes.
A portion of the spinal cord, showing its right lateral surface. The dura is opened and arranged to show the nerve roots.
Scheme showing structure of a typical spinal nerve.

SUNY Figs 02:04-12
Atlas of anatomy at UMich n3a6p1 - "Autonomic Connections of the Spinal Cord"
Anatomy Atlases - Microscopic Anatomy, plate 06.114 - "Spinal Root Nerve Fibers"
Diagram at tcc.fl.edu (look for #2)

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Anterior root of spinal nerve
	The formation of the spinal nerve from the dorsal and ventral roots
Latin	radix anterior nervi spinalis
Gray's	subject #208 916
MeSH	Ventral+Roots