ZOO 2090 Lecture Notes - Lecture 19: Platypus, Oval Window, Golgi Tendon Organ

• School: University of Guelph
• Department: Zoology
• Course: ZOO 2090
• Professor: Fred Laberge

Document Summary

Components of sensory organs the receptor is a transducer that transforms a stimulus into electrical impulses which spread to cell body along its axon and to other neurons, usually cns. Photoreceptors cells capable of phototransduction (generate electrical potential with photon absorption) photoreceptor neurons are organized into the complex epithelium of the retina in the eyes rods for light, cones for colour. Retina signal from photoreceptor neurons is processed within the retina before it reaches the ganglion cells, the output neurons of the eyes. Adaptation to dim light: large eyes: large pupil, large lens close to retina, few cones or none, slender rod cells are closely packed, tapetum lucidum (mirror) can be present (deer in the headlights) Infrared receptors cells capable of detecting infrared radiation emanating from the surface of warm objects. Muscle spindles and golgi tendon organs monitor muscle contraction and limb flexion, enabling the brain to keep track of body position.