On a Snellen chart we determine the line that the person can just recognize. If that line is twice as large as the reference standard (20/20), we state that that personâs MAgnification Requirement (MAR) is 2x. If the MAgnification Requirement is 2x, the visual acuity is 1/2 (20/40).
Posterior cranial fossa: It is the deepest and most capacious of the 3 cranial fossae. It contains the cerebellum, pons, and medulla oblongata. The foramen magnum is located centrally and inferiorly in the posterior fossa.
(A) The pons functions to link the cerebellum with the higher conscious centers. (B) The limbic system alerts the cortex of incoming stimuli. (C) The limbic system is associated with emotional responses. (D) The nuclei of cranial nerves 5, 6, 7, and 8 are located in the pons.