Fissure

Fissure

A deep cleft in the brain; distinguished from sulci, which are shallower cortical infoldings.

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Part of Speech: noun
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Industry/Domain: Biology
Category: Neuroscience
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Related terms

fissure

Biology; Neuroscience

A deep cleft in the brain; distinguished from sulci, which are shallower cortical infoldings.

fissure

Natural environment; Coral reefs

A deep and narrow depression cutting across the reef front with origins relating to jointing planes in the reef limestone or non-limestone bedrock.

fissure

Education; SAT vocabulary

A crack or crack-like depression.

fissure

Environment; Land preservation

A long narrow crack in a rock or cliff. If water has dissolved minerals in it passes through a fissure,it becomes filled with minerals.

fissures

Natural environment; Volcano

Elongated fractures or cracks on the slopes of a volcano. Fissure eruptions typically produce liquid flows, but pyroclastics may also be ejected.

fissure

Astronomy; Planetary science

Crack extending far into a planet or moon through which magma travels to and erupts onto the surface.

medial longitudinal fasciculus

Biology; Neuroscience

Axon tract that carries excitatory projections from the abducens nucleus to the contralateral oculomotor nucleus; important in coordinating conjugate eye movements.

commissures

Biology; Neuroscience

Axon tracts that cross the midline of the brain. See also anterior commissure.

postganglionic axons

Biology; Neuroscience

Axons that link visceral motor neurons in autonomic ganglia to their targets.

climbing fibers

Biology; Neuroscience

Axons that originate in the inferior olive, ascend through the inferior cerebellar peduncle, and make terminal arborizations that invest the dendritic tree of Purkinje cells.