anterior horn


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an·te·ri·or horn

[TA]
1. the frontal or anterior division of the lateral ventricle of the brain, extending forward from the Monro interventricular foramen;
See also: anterior column, gray columns.
2. the anterior horn or anterior (ventral) gray column of the spinal cord as appearing in cross section. The anterior horn is composed of the spinal laminae VIII and IX [TA] of Rexed with portions of VII also extending into its geographical boundaries in lumbosacral and cervical levels. The nuclei of the anterior horn are the anterolateral nucleus [TA] or ventrolateral nucleus [TAalt] (nucleus anterolateralis [TA]), anterior nucleus [TA] (nucleus anterior [TA]), anteromedial nucleus [TA] or ventromedial nucleus [TAalt] (nucleus anteromedialis [TA]), posterolateral nucleus [TA] or dorsolateral nucleus [TAalt] (nucleus posterolateralis [TA]), retroposterior lateral nucleus [TA] or retrodorsal lateral nucleus [TAalt] (nucleus retroposterolateralis [TA]), posteromedial nucleus [TA] or dorsomedial nucleus [TAalt] (nucleus posteromedialis [TA]), central nucleus [TA] (nucleus centralis [TA]), and the accessory nucleus and phrenic nucleus (both found in cervical levels only).
See also: anterior column, gray columns.
Synonym(s): cornu anterius [TA], ventral horn

anterior horn

Etymology: L, ante + prior, foremost, cornu, horn, spina, spine; Gk, chorde, string
one of the hornlike projections of gray matter into the white matter of the spinal cord. The anterior horn contains efferent fibers innervating skeletal muscle tissue. Also called anterior column, ventral column, ventral horn.

an·te·ri·or horn

(an-tēr'ē-ŏr hōrn) [TA]
1. The anterior or frontal division of the lateral ventricle of the brain, extending forward from Monro interventricular foramen.
See: lateral ventricle
2. The anterior or ventral gray column of the spinal cord as appearing in cross-section.
See also: gray columns
Synonym(s): cornu anterius [TA] , precornu, ventral horn.

an·te·ri·or horn

(an-tēr'ē-ŏr hōrn) [TA]
1. [TA] Frontal or anterior division of the lateral ventricle of the brain, extending forward from the interventricular (Monro) foramen.
2. Anterior horn or anterior (ventral) gray column of the spinal cord as appearing in cross-section.
References in periodicals archive ?
Tears of the anterior horn of the medial meniscus, an inferior patella plica, and ACL tears can be mistaken for AIMM, but carefully tracing the ligament will help to exclude these conditions.
Nonspecific immunoglobulin and plasmapheresis should be considered for patients with Guillain-Barre syndrome but are not indicated for patients with paralysis due to damage of anterior horn cells (30).
One hypothesis is that the reduction of the number of anterior horn cells at the initial onset of the poliovirus is a factor.
These findings were consistent with a severe, asymmetric process affecting anterior horn cells or motor axons.
In seven cases, the evaluation suggested involvement of spinal cord gray matter--specifically anterior horn cells.
Werdnig-Hoffman disease is a neuromuscular disorder caused by loss of anterior horn cells and motor nuclei of cranial nerves V through VIII.
5 mm AP diameter base of left anterior horn core 27.
I-waves are also diminished upon reaching the anterior horn cell, necessitating a sequential time-locked train of activity rather than a single stimulus.
The intrameniscal signal in the anterior horn was compatible with mucinous degeneration.
Autopsy studies have long told us that patients with CNS infection by the poliovirus needed to lose at least 50% of anterior horn cells before detectable muscle strength loss occurred," the authors wrote.
A poliomyelitislike syndrome likely involving spinal anterior horn cells is the most common mechanism of WNV-associated paralysis and is associated with significant short- and long-term illness and death.
Destruction of the spinal anterior horn cells may also cause acute flaccid paralysis (AFP), presenting as asymmetric limb weakness, hypoflexia or areflexia, and acute bowel or bladder dysfunction that may appear without signs of meningoencephalitis.

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