Fibra de associação

*Fibras de associação*
Fibras de associação
	; Diagrama mostrando os principais sistemas de fibras de associação no cérebro.
	; Dissecção do córtex cerebral e do tronco cerebral mostrando as fibras de associação e o córtex insular após a remoção de sua substância cinzenta superficial.
Identificadores
Latim	Fibrae associationis telencephali

Fibras de associação são axônios mielinizados que conectam áreas corticais dentro do mesmo hemisfério cerebral.^[1]

Na neuroanatomia humana, os axônios (fibras nervosas) podem ser categorizados com base em seu curso e conexões como fibras de associação, fibras de projeção e fibras comissurais.^[1]

As fibras de associação unem diferentes partes do mesmo hemisfério cerebral e são categorizadas em dois tipos: (1) fibras curtas que conectam giros adjacentes; (2) fibras longas que fazem conexões entre partes mais distantes.^[2]

Fibras curtas

Muitas das fibras curtas de associação (também chamadas de fibras arqueadas ou "U") ficam imediatamente abaixo da substância cinzenta do córtex dos hemisférios e conectam-se aos giros adjacentes.^[2] Algumas ultrapassam de uma parede do sulco para a outra.^[2]

Fibras longas

As fibras longas de associação conectam os giros mais amplamente separados e são agrupadas em feixes,^[2] incluindo as seguintes:

Ver também

Interneurônio

Referências

↑ ^a ^b Standring, Susan (2005). Gray's Anatomy: The Anatomical Basis of Clinical Practice 39 ed. [S.l.]: Churchill Livingstone. 411 páginas. ISBN 9780443071683. The nerve fibres which make up the white matter of the cerebral hemispheres are categorized on the basis of their course and connections. They are association fibres, which link different cortical areas in the same hemisphere; commissural fibres, which link corresponding cortical areas in the two hemispheres; or projection fibres, which connect the cerebral cortex with the corpus striatum, diencephalon, brain stem and the spinal cord.
↑ ^a ^b ^c ^d Standring, Susan (2005). Gray's Anatomy: The Anatomical Basis of Clinical Practice 39th ed. [S.l.]: Churchill Livingstone. 411 páginas. ISBN 9780443071683. Association fibres may be either short association (arcuate or 'U') fibres, which link adjacent gyri, or long association fibres, which connect more widely separated gyri. Short association fibres may be entirely intracortical. Many pass subcortically betweena adjacent gyri, some merely pass from one wall of a sulcus to the other. Long association fibres are grouped into bunbles, [...]

Ligações externas

NeuroNames ancil-672
NeuroNames ancil-673

[:0-1] Standring, Susan (2005). Gray's Anatomy: The Anatomical Basis of Clinical Practice 39 ed. [S.l.]: Churchill Livingstone. 411 páginas. ISBN 9780443071683. The nerve fibres which make up the white matter of the cerebral hemispheres are categorized on the basis of their course and connections. They are association fibres, which link different cortical areas in the same hemisphere; commissural fibres, which link corresponding cortical areas in the two hemispheres; or projection fibres, which connect the cerebral cortex with the corpus striatum, diencephalon, brain stem and the spinal cord.

[:1-2] Standring, Susan (2005). Gray's Anatomy: The Anatomical Basis of Clinical Practice 39th ed. [S.l.]: Churchill Livingstone. 411 páginas. ISBN 9780443071683. Association fibres may be either short association (arcuate or 'U') fibres, which link adjacent gyri, or long association fibres, which connect more widely separated gyri. Short association fibres may be entirely intracortical. Many pass subcortically betweena adjacent gyri, some merely pass from one wall of a sulcus to the other. Long association fibres are grouped into bunbles, [...]

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