Fig. 12 VIEW OF THE STRUCTURES OF THE HEAD IN A PLANE SLIGHTLY LATERAL TO THE MIDSAGGITAL PLANE
This figure offers an inside view of approximately the right half of the head. The cranial cavity, from which the brain was removed, is exposed in all its parts (except for the "roof"). In taking the brain out, all cranial nerves were cut off and left in their exits in the floor of the cavity (I, II, III, IV, V, VI, VII, VIII, IX, X, XI, XII). In the posterior fossa (137), besides the nerves, most of the venous sinuses through which the used-up blood, leaves the cranium, including the transverse (133) and the sigmoid sinuses (132), are seen. At its lower end, the foramen magnum (123), the posterior fossa narrows into thevertebral canal (124). The spinal cord (143) contained in it may be seen in the opposite Fig. 13. The cord having been removed, the segmental spinal roots and the long accessory nerve (XI) may be seen in the wall of the channel. The structures of the auditory apparatus, being more laterally situated, have completely disappeared except the acoustic nerve in the internal auditory meatus (VIII).