Monday, February 21, 2011

Meyer's Loop

Meyer's loop is the most anterior extension of the optic radiation which sweeps back on its self into the temporal lobe. The last relay of the visual pathway corresponds to fibers from the lateral geniculate nucleus which project to the occipital cortex. As they go into the temporal lobe, these fibers are known as optic radiations, which constitute the geniculocalcarine tract. The anterior extension of these fibers in relation to the temporal horn is known as Meyer's loop, which travels around the temporal horn, making a wide anterior and lateral loop around the temporal horn of the lateral ventricle before curving around the posterior atrium to reach the occipital cortex. Meyer's loop can be injured in temporal lobectomy, resulting in a superolateral field cut, the so called pie-in-the-sky field cut.