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The Nervous System

General Senses Touch, Pressure, Stretch, Hot, Cold and Pain. Receptors for general senses are located thru out the body
Thermoreceptors Temperature
Nociceptors Pain receptors, respond to tissue injury
Mechanoreceptors Touch, vibration, stretch and pressure
Receptors in the Skin Free nerve ending, Tactile corpuscles, Hair receptors, Lamellar corpuscles, Bulbous corpuscles and Tactile disk
Free Nerve Ending Dendrites with no associated with connective tissue, Widspread, Respond to heat, cold and pain
Tactile Corpuscles Mechanoreceptor for light, toch and texture(the difference between silk and sand paper)
Hair Recptors Mechanoreceptors for any light touch that bends the hair
Lamellar Corpuscles Mechanoreceptors for deep pressure(something smashing you), stretch and vibration
Bulbous Corpuscles Mechanorecptorss for heavy touch, pressure and stretching of the skin
Tactile Disk Mechanoreceptor for light touch
General Senses in the Skin Neurons for general senses send messages on the type of touch were receiving(hot,deep,stretch), location, intensity and thr duration of the sensation
Cranial Nerve General Senses Responsible for sensation related to our head
Spinal Nerve General Senses Responsible for sensation below the head
Referred Pain Pain signals from the internal organs often follow the same pathways as skin receptors. not actually felt in the organ
Sensation Messages Sent to the Hypothalamus or Amygdala may initiate an emotional response
Special Senses located in the head Taste, Smell, Hearing, Equilibrium and vision
Smell Bipolar Neuron in shape, Olfactory cell, that stick out the mucosa in the nasal cavitiy thru the cribiform plate to the brain.
Olfactory Hairs in Mucosa Are Chemoreceptors
Phyiology of Smell The pathway for smells involves the olfactory nerve and does not go thru the thalamus on its way to the frontal lobe
Pathway for Smell Bipolar Neuron- CNI- Temporal Lobe(general sensory area) to the Frontal Lobe(decision area) or Hypothalamus and amygdala( emotional response)
Taste sense organ is the taste bud
Taste Buds Located mostly on the tongue and contain different cells. within taste buds are taste hairs that are chemoreceptors
Basal Cells in Taste Bud Stem cells that replace dead taste cells
Support Cells Physically support the 50-150 taste cells in each taste bud
Primary Taste Salt,sweet,sour,bitter and umani (delicious)
Interperting Taste 80% smell
Pathway for Taste 3 Cranial nerve- Medulla Oblongata- to the pons, midbrain, thalamus, to the parietal lobe or to the hypothalamus and amygala
Hearing The ear can be divided into 3 sections: External ear, the middle ear and the inner ear
External Ear 2 Parts Pinna and External Auditory Canal
Pinna/Auricle (fleshy part) Funnel like structure made of cartliage and skin, attached to side of head
External Auditory Canal Short tube extending from pinna to eardrum, has ceruminous glands
Cerumen Ear wax
Sound Waves Hit the pinna enter the auditory canal to the middle ear
Middle Ear 4 components Typanic Membrane(Eardrum), Typanic Cavity, Auditory Tube and Ear Ossicles
Typanic Membrane Stretched piece of membrane inside the auditory canal, outside covered in skin inside covered in mucous membrane
Typanic Cavity Filled with air in the temporal bone, helps to process sound
Auditory Tube Connects typanic cavity with the pharynx, equalizing air pressure behind the ear so the eardrum can function properly
Ear Ossicles 3 tiny bones Mallus, Incus and Stapes interact with eachother to transmit sound waves
Vibrations from Typanic Membrane Pass from the Malleus(takes sounds from the typanic membrane) to the Incus to the Stapes then vibrates on the oval window of inner ear
Inner Ear 2 series of tubes and chambers one inside the other.
Created by: myrnasGirl3
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