343 Lecture 5: Lecture 5
Document Summary
Touch and pressure: baroreceptors (vertebrates), tactile receptors (vertebrates and inverts) and proprioceptors (vertebrates and inverts) Equilibrium and hearing: (vertebrates and inverts) statocysts, hair cells, neuromasts and electroreceptor. Detect pressure changes in the walls of blood vessels, parts of the heart, digestive system, reproductive system and urinary tracts. Eg: carotid sinus baroreceptors (in the carotid body) monitor blood pressure to the brain. Detect touch, pressure and vibration on the body. They are tonic receptor cells (send a signal as long as there is stimulus). They detect light touch and pressure on the skin"s surface. Free nerve endings: sensory neurons with dendrites interspersed among epidermal cells. Merkel"s disks: enlarged epidermal cell associated with free nerve endings. They have small receptive elds which allow for ne discrimination to stimulus. Root hair plexus: nerve endings wrap around the base of hair follicles and respond when the hair is displaced (phasic). Detect changes in movement across the body"s surface.
