Illustrated Encyclopedia of Human Anatomic Variation: Opus II: Cardiovascular System

Absence of Dural Sinuses. Absence of Confluens of Dural Sinuses. Bifurcation and Reunion of Superior Sagittal (Longitudinal) Brief Doubling of Superior Sagittal (Longitudinal) Sinus.

Ronald A. Bergman, PhD
Adel K. Afifi, MD, MS
Ryosuke Miyauchi, MD
Peer Review Status: Internally Peer Reviewed

A: Absence of confluens (after Hallett). COL, Communication between the right occipital sinus and the sigmoid sinus (on the same side) is absent; CSO, common canal of the occipital sinuses; POI, internal occipital protuberance; SC, cavernous sinus; SLL, left transverse sinus; SLR, right transverse sinus; SLS, superior sagittal sinus; SPI, inferior petrosal sinus; SPS, superior petrosal sinus; SR, sinus rectus (straight); TO, foramen magnum; VC, vein (occipital emissary) communicating to region of confluens (rare observation).

B: Bifurcation of superior sagittal sinus. B, Bifurcating branch of superior sagittal sinus; PH, confluens of sinuses (torcular herophili); SLL, left transverse sinus; SLR, right transverse sinus. C: Bifurcation of superior sagittal sinus (after Vicq d'Azyr).

Redrawn from Labbé, C. Anomalies des sinus de la durc-mere. Dévelopment de ces sinus. Considérations sur la suppléance réciproque de ces canaux veineux dans les cas d'absence de I'un d'eux description de quelques sinus peu connus. Arch. Physiol. S. 3 1:1-27, 1883.

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