n :  any of the three large depressions in the posterior, middle, and anterior aspects of the floor of the cranial cavity  a  :  the posterior one that is the largest and deepest of the three and lodges the cerebrum, pons, and medulla oblongata - called also posterior cranial fossa , posterior fossa   b  :  the middle one that lodges the temporal lobes laterally and the hypothalamus medially - called also middle cranial fossa , middle fossa   c  :  the anterior one that lodges the frontal lobes - called also anterior cranial fossa , anterior fossa  .
 
 
 
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