How To Remove An Embedded Tick On A Dog Or A Cat. 1  1. First, you have to locate where the tick is by pushing the fur away from the site. 2  2. Get tweezers or a tick removal tool with thin ends and grip the tick sideways near its head. 3  3. Try to pull it quickly so that the wound will not be infected.
The pupillary light reflex (PLR) is a reflex that controls the diameter of the pupil, in response to the intensity (luminance) of light that falls on the retinal ganglion cells of the eye, thereby assisting in adaptation to various levels of lightness/darkness.he pupillary reflex pathway begins with the photosensitive retinal ganglion cells, which convey information to the optic nerve (via the optic disc). The optic nerve connects to the pretectal nucleus of the upper midbrain, bypassing the lateral geniculate nucleus and the primary visual cortex.
The response to this light reduction is the same as that in the first instance both pupils dilate to an appropriate amount. The afferent pupillary defect (Marcus Gunn pupillary escape phenomenon) depends on the light-reduction response that occurs in the presence of a conduction defect in the optic nerve.In attempting to demonstrate the afferent pupillary defect in a patient, the physician shines the light into each eye separately.he response to this light reduction is the same as that in the first instance both pupils dilate to an appropriate amount. The afferent pupillary defect (Marcus Gunn pupillary escape phenomenon) depends on the light-reduction response that occurs in the presence of a conduction defect in the optic nerve.