Seios venosos durais

Seios venosos durais
Seios venosos durais
Veias durais
Secção sagital do crânio, mostrando os seios venosos da dura-máter.
Nome Latim s. durae matris

Os seios venosos durais (também chamados de seios durais, seios cerebrais ou seios cranianos) são canais venosos encontrados entre as camadas de dura-máter no cérebro.[1]

Eles recebem sangue das veias internas e externas do cérebro,

Recebem ainda líquido cefalorraquidiano (líquor) do espaço subaracnóideo através de granulações aracnoideias que se encontram presentes nas cavidades areolares da dura máter (também chamadas de saculações) (apenas no seio sagital superior).

Drenam na veia jugular interna.

Uma trombose nalguns destes seios provoca um aumento de pressão craniana que em última analise pode levar à morte.[2]

Seios venosos

Nome Drena para
Seio sagital inferior Seio reto
Seio sagital superior Confluência dos seios
Seio reto Confluência dos seios
Seio occipital Confluência dos seios
Confluência dos seios Seio transverso
Seio cavernoso Seios petrosos superior e inferior
Seio transverso Seio sigmóide
Seio petroso superior Seio sigmóide
Seio petroso inferior Veia jugular interna
Seio sigmóide Veia jugular interna

Relevância Clinica

Trauma aos seios venosos durais pode resultar em trombose dentro destes. Outra causa comum de trombose dos seios durais é celulite orbitária. Embora raras, as tromboses de seios venosos durais podem resultar em hemorragia, necrose tecidual e edema cerebral. Tais complicações ocasionalmente levam à deficiências neurológicas, epilepsia e até morte.[3]

Referências

  1. ↑ Kiernan, John A. (2005). Barr's The Human Nervous System: An Anatomical Viewpoint. [S.l.]: Lippincott Williams & Wilkins. pp. 428–230. ISBN 0-7817-5154-3. Consultado em 4 de fevereiro de 2008. Arquivado do original em 14 de maio de 2011 
  2. ↑ Michael Rubin and Joseph E. Safdieh. Netter's concise neuroanatomy. [S.l.]: Saunders Elsevier 
  3. ↑ de Bruijn SF, Stam J (1999). «Randomized, placebo-controlled trial of anticoagulant treatment with low-molecular-weight heparin for cerebral sinus thrombosis». Stroke. 30 (3): 484–8. PMID 10066840. doi:10.1161/01.str.30.3.484 
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