It is a closed sac having two layers: the visceral layer (epicardium), immediately surrounding the heart, and the outer parietal layer, forming the sac, composed of strong fibrous tissue, the fibrous pericardium, lined with a serous membrane, the serous pericardium. Synonym(s): heart sac, theca cordis.
The right and left cavernous sinuses are interconnected by the anterior and posterior intercavernous sinuses. Tributaries of the cavernous sinus include the superior ophthalmic, superficial middle cerebral, and inferior cerebral veins and the sphenoparietal sinus.
double-outlet right ventricle incomplete transposition of the great ventricles in which both the aorta and the pulmonary artery arise from the right ventricle, associated with a ventricular septal defect. fifth ventricle the median cleft between the two laminae of the septum pellucidum.