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Sensory and Reproduc


What do sensory receptors change senstory stimuli into Nerve Signals
What do the components of the brain interact to do? Receive sensory input Integrate and Store info Transmit Motor Responses
Sensation Conscious or Unconscious awareness of external or Internal Stimuli
Superficial Sensation AKA Ecteroreceptive Sensation Includes Touch, Pain, Temperature from the surface of the body
Deep Sensation Includes muscle fascia, bone and joint pain, vibration, pressure and propicoeption
General Senses Touch, Pain, Itch, Tickle, Vibration and Pressure
Special Senses Vision, Smell, Taste hearing and equilibrium
4 components to perceive a sensation 1. Stimulation of the reception filed 2. Transduction of the stimulus 3. Impulse Generation and Conduction 4.Integration of Sensroy input
Stimulation of the receptive field (1) With approrpriate quality and strength will cause the sensory neuron to initiate a nerve impulse
Transduction of the stimulius (2) conversion
Impulse Generation and Conduction (3) From PNS - CNS
1ST order neuron conducts impulse from spmatoreceptros from brain to spinal cord
2ND Order Neruon Conducts impulse from somatosensoryreceptros to thalmus
3RD order Neuron Conducts impulse from thalamus to somatosenroy cortex, where conscious perception of sensation is located (3 synapses)
Free Nerve Endings found everywhere in the body
Encapsulated Nerve Endingds Found in non hairy parts of the skin
Separate Cells located in sense organs ex. eyes ears
Exterorecetors receptors to general and special sense , located on the surface of the body
Interoreceptors located in the blood
Propireceptors Located in muscles tendons joints stimulated by movement
Thermoreceptors Detect cahnge in temperature
nocireceptors detect chemical/physical damage to tissue
Chemoreceptros Detect taste in mouth
Tactile Sensation stimulation of receptors in skin tissues right beneath the skin
Vibration caused by rapid repetitive sensory signals
Itch/Tickle from receptors in superficial layer by release of bradykimin
Messiners Corpuscles encapsulated nerve endings that elicit large myelinated sensory nerve fibers
Merkels Disk Flattened dendrites of sensory neurons Allows you to determine continuous touch against skin
Ruffini's End Organ Deep layers of dermis/ fast adapting -determines heavy continuous touch and pressure
Lamellated -Stimulated by rapid tissue movement -Detects vibrations and other extreme changes
Crude Touch knowing something has touched the skin
Fine TOuch Ability to recgonize exact location, shape size and texture of stimulus
What is the only sensation you can elicit on yourself Tickle
An itch sensation alerts attention to a _____ stimulus on the skin surface, which -elicts the ____ reflex to rid the irritant 1. Mild 2. Scratch
If the scratch reflex is strong what receptors are stimulated? Pain
Phantom Pain Sensation of pain in an amoutated limb --> brain neurons are still active
Mechanoreceptors detect environment changes
Pain protective mechanism when tissues are being damaged
Fast Pain .1 second after stimulus (acute and sharp)
Slow pain 1. second after stimulus and increases over seconds. (throb, burning)
Somatic Pain Superficial: skin receptors Deep: Skeletal muscles and tendons
Visceral Pain comes from the internal organs. nociceptors send signals to the spinal cord and brain when damage is detected -- feels originated from skin
Referred Pain pain being felt in an area away from the actual source of the pain.
Joint Kinesthetic Receptors Respond to pressure around synovial joints, within the CT. Responds to excelleration and deceleration movements of joints
Muscle Spindle Apparatus Stimulated bu motor neurons to provide feedback on the degree of muscle stretching
Golgi Tendon Organs Protect tendons and muscles from damage by decreasing muscle tension
Posterior Column medial lemomisus pathway to the cortex impulses conducted along this pathway are concerned with fine touch, proprioception, and vibratory sensations
Gracile Fasciculus and Cuneate Fasciculus Ascending tracts from white matter
Posterior Pathway to the cortex 1st neuron -SC- medulla -2nd neurons- either gracile or cuneate fasiculi-either the gracile /cuneate nucleus -crossing over (decussating) in the medulla- medial lemniscus-Thalamus -- 3rd neurons-primary somatosensory cortex-perception of the sensation
ANTERIOLATERAL Mainly carry pain and temperature impulses
Syphilis Causes a progrssive degeneration of the posterior spinal cord
Syphalis Organism Treponema Pallidum Symptoms: uncoordinated gait, paralysis and insanity
Created by: christinarayyyy



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