Fig. 43-16 Median sections. A shows important features of the brain stem and a cross section of the midbrain. The interthalamic adhesion is indicated by an asterisk. B emphasizes the meninges, subarachnoid space, and cisterns. Aq., aqueduct; Ep., epiphysis (pineal body); 1, fissura prima; 2, fissura secunda; 3 and 4, third and fourth ventricles. The interrupted line indicates the orbitomeatal plane, which has been used for orientation, thereby rendering the brain stem almost vertical.
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