pwerpint - Special Senses Click to edit Master subtitle...

Info icon This preview shows pages 1–13. Sign up to view the full content.

View Full Document Right Arrow Icon
Click to edit Master subtitle style 7/12/11 Special Senses
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
7/12/11 Stimulus/Receptor A stimulus is sensory input that causes changes within the body pain, heat, pressure, sound Receptors are specialized structures that receives stimulus and converts it to another form of energy transduction Receptors may be simple – bare nerve endings or complex such as sense organs –
Image of page 2
7/12/11 Stimulus/Receptor Sensory receptors transmit 4 kinds of information 1 . Modality – type of stimulus such as vision, pain 2. Location – which nerve fibers are sending signals to the brain Receptive field Intensity – sound may be loud or soft/light maybe bright or dim Duration – how long a stimulus lasts; when the stimulus is prolonged, the firing of the neuron gets slower and become less aware of the stimulus - adaptation
Image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
7/12/11 Classification of Receptors 1 . Stimulus modality Thermoreceptors Chemoreceptors Nociceptors Photoreceptors Mechanoreceptors 2 . Origin of stimulus Exteroceptors Interoceptors Proprioceptors
Image of page 4
7/12/11 Somatic Sensation Originate from receptors present at more than one location in the body Temperature, pain, touch, vibration, awareness of body movements Essential in helping to coordinate movements, avoid dangers and maintain body temperature Located throughout the body in the skin, joints, skeletal Parts of the body with the greatest sensitivity involve more neurons
Image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
7/12/11 Special Senses Special senses restricted to particular areas of the body Taste – tongue Smell – nose Hearing – ear Balance – ear Vision - eye
Image of page 6
7/12/11 Nociceptors Pain receptors Pain is adaptive and necessary sensation Two types of nociceptors Myelinated pain fibers; fast pain – sharp pain, localized stabbing pain Non-myelinated pain fibers; slow pain – dull, diffuse pain Injured tissues release chemicals that stimulate the nociceptors
Image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
7/12/11 Nociceptors Pain signals reach brain via 2 routes From head – brain stem by 4 cranial nerves to pons then descend to medulla oblongata; then to thalamus and cerebral cortex From neck and below – travel by 3 ascending spinal cord tracts – to thalamus then to cerebral cortex
Image of page 8
7/12/11 Nociceptors Referred Pain Pain from visceral is often misinterpreted as coming from skin Example pain from heart attack – along left shoulder and down medial side of left arm Referred pain is convergence of neural pathways; nerve input from heart and skin converge on same spinal interneurons Then input goes from thalamus to cerebral cortex Pain modulation CNS produces analgesics such as enkephalins,
Image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
7/12/11 Nociceptors
Image of page 10
7/12/11 Chemoreceptors Respond to chemicals in an aqueous environment Receptors are excited by food chemicals in saliva ; excited by airborne chemicals that dissolve in mucus The receptors for taste and smell complement each other and respond to many of the same stimuli
Image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
7/12/11
Image of page 12
Image of page 13
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern