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.
Answer 4-2. In the right eye the medial rectus and the superior oblique would be the prime movers, while in the left eye, the lateral rectus and the inferior rectus would be most active. 4-3. What position will the patient's head assume (in order to prevent diplopia) if their right trochlear nerve is damaged?