SENSORY RECEPTOR - The part of a neuron or specialized cells that generates action potential in neuron. -Often associated with nonneural cells that surround it, forming a sense organ -Including mechanical (touch, pressure), thermal (degree of warmth), electromagnetic (light), chemical energy (odor, taste, concentration of O 2 and CO 2 ) -Require adequate stimulus to generate action potential
SENSORY MODALITY -Vision -Hearing -Smell -Taste -Rotational acceleration -Linear acceleration -Touch-pressure -Warmth -Cold -Pain -Joint position and movement -Muscle length -Muscle tension -Arterial blood pressure -Central venous pressure -Inflation of lung -Blood temperature in brain -Arterial PO2 -pH of CSF -Osmotic pressure of plasma -Arteiovenous blood glucose difference
Classification of sensory receptors: 1.Teleceptors (distance receivers) 2.Exteroceptors 3.Interoceptors 4.Proprioceptors (body image) Cutaneous sense : -Touch-pressure -Cold-warmth -Pain
Two systems in sensory transmission: 1.The dorsal column-Lemniscal System - localization touch system - fine touch system - vibratory sensation - position - pressure 2.The anterolateral system / sys. spinothalamicus lateralis - pain - thermal sensation - tickle and itch sensation - sexual sensation - crude touch
TONGUE Has 2 important innervations Has 2 important innervations 1.N. lingualis (branch of N. trigeminus), innervate the pressure, touch and pain. 2.N. facialis, innervate the taste
PAIN Sheringtons philosophy: unique built-in unpleasant affect the physical adjunct of an imperative protective reflex
PAIN Is one of the somatic sensory modalities Is one of the somatic sensory modalities Receptor: FREE NERVE ENDING Receptor: FREE NERVE ENDING Sensory peripheral nerve: - Aδ type (myelinated): for fast pain - C type (unmyelinated): for slow pain Sensory peripheral nerve: - Aδ type (myelinated): for fast pain - C type (unmyelinated): for slow pain Medulla spinalis conduction: - anterolateral system atau tractus spinothalamicus lateralis Medulla spinalis conduction: - anterolateral system atau tractus spinothalamicus lateralis Center of perception and interpretation: - gyrus post-centralis / SSA I Center of perception and interpretation: - gyrus post-centralis / SSA I
Fast pain: -Also known as sharp pain, pricking pain, acute pain, electric pain. -Occurs within about 0.1 seconds after pain stimulus applied Slow pain -Begins after 1 second or more seconds after pain stimulus applied and then increases slowly. -Also known as burning pain, aching pain, throbbing pain, nauseous pain, chronic pain. In which category DENTAL PAIN belongs to?
S. S. A. I : Gyrus Postcentralis PAIN - Impuls pathways Free nerve endings A / C Med. Spinalis Thalamus Tr. Spino- thala micus
Pain mechanism on Free Nerve Ending trauma Neurolemma / axolemma Some substances Free nerve ending
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