Mesoscopy and scanning electron microscopy of the trabelular projections in the superior sagittal sinus

MESOSCOPY AND SCANNING ELECTRON MICROSCOPY OF THE TRABELULAR PROJECTIONS IN THE SUPERIOR SAGITTAL SINUS (ABSTRACT)^*. THESIS. Botucatu, 1999.

SIDNEI PETRONI^**

The trabecular projections in the superior sagittal sinus were both classified and quantified depending on their presentation in types and subtypes, as well in thirds, portions and antimeres, according to their location.

The horizontal and vertical ones address the laminar blood flow, while the valvar type both guide the blood flow and protect the ostium of opening of the superior cerebral veins that empty in the superior sagittal sinus, that has been described as without valves.

According to a schematic model, it was observed that the trabecular projections of the valvar type presented a higher incidence than either the horizontal and vertical types and that all the types prevailed in the central third, the longest extension of the sinus.

There was a preponderance of simple subtype in the horizontal type over the ramified and reticular subtypes, while in the vertical type, the sagittal, parassagittal and unilateral subtypes presented very close values.

In the valvar type, the trabecular projections localized in the inferior portion of the lateral wall of sinus, prevailed over the projections presented at the superior portion of the wall.

Concerning the distribution in the sides of the sinus, the trabecular projections of horizontal and vertical types prevailed in the left side, a place where it presents its larger deviation, while the valvar type had almost the same distribuition on both sides, considering that the superior cerebral veins present only small variations.

Analyzing the distribuition of the superior sagittal sinus and the straight sinus in the confluence of the sinuses, it can be verified that the single or simple confluence presented a lesser incidence when compared with the sum of the forked types, and that the right transverse sinus presents a larger lumen, frequently receiving the blood from the superior sagittal sinus, while the straight sinus incline towards left and continues as the left transverse sinus.

KEY WORDS: dura mater, superior sagittal sinus, trabecular projections.

** Address: Departamento de Anatomia UNESP, Rubião Júnior, 18618-000 Botucatu SP, Brasil.

*

Mesoscopia e microscopia eletrônica de varredura das projeções trabeculares no interior do seio sagital superior (Resumo). Tese de Doutorado, Instituto de Biociências da Universidade Estadual Paulista (Área: Anatomia). Orientador: Oisenyl José Tâmega.

Publication Dates

• Publication in this collection
  03 Apr 2000
• Date of issue
  Dec 1999