BIOL373L Study Guide - Stapes, Vergence, Dorsal Root Of Spinal Nerve
10 Jun 2014
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The special senses: vision, vision acuity, snellen chart used to determine visual acuity, visual acuity: the degree of detail the eye can distinguish, stand 6 meters from the chart (without corrective glasses). The somatic senses: like the proprioceptors, the receptor cells of the skin are widespread, not grouped into organs, there are a variety of sensory neurons in the skin, each sensitive to one type of stimulus: In the skin, stimulation of at least two spatially separated touch-sensitive nerve endings must occurred. More likely to happen if the touch stimuli are widely spaced and if the two stimuli occur in sensitive areas of the skin. 15-25 cold points per cm2 in the lips, 3-5 cold points in the finger, and less than 1 point in some broad areas of the trunk. The receptor is a sensor cell which converts the stimulus to a sequence of action potentials that are passed along an afferent (sensory) neuron to the spinal cord.
