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.
pons. n. pl. ponÂ·tes (pÅnâ²tÄz). 1. A slender tissue joining two parts of an organ. 2.A band of nerve fibers on the ventral surface of the brain stem that links the medulla oblongata and the cerebellum with upper portions of the brain.Also called pons Varolii.ons. n. pl. ponÂ·tes (pÅnâ²tÄz). 1. A slender tissue joining two parts of an organ. 2.