Physiology of Sensations

  1. Sensory Receptors
    structures that transmit information about changes in the external and internal environment of the animal
  2. Exteroreceptors
    located at or near the surface of the body and are sensitive to stimuli outside the body
  3. Interoreceptors
    transmit sensations of pressure, pain, fatigue, hunger, thrist, and nausea
  4. Mechanoreceptors
    detect mechanical or physical deformation of the receptor itself or adjacent cells
  5. Thermoreceptors
    detect changes in temperature
  6. Nociceptors
    detect pain, usually as a result of physical or chemical damage to tissues
  7. Photoreceptors
    detect light on the retina of the eye
  8. Chemoreceptors
    detect taste in the mouth, smell in the nose, and chemicals in body fluids such as oxygen, CO2, water, and glucose
  9. Simple Receptors
    typically modified dendritic endings of sensory neurons and are found in the skin, mucous membranes, muscles, and connective tissues
  10. General Senses
    detect tactile sensations (such as pressure, stretch, touch, vibration), pain, hear, cold, and proprioception
  11. Complex Receptors
    sense organs comprised of a variety of cells that work together to accomplish specific receptive processes
  12. Special Senses
    equilibrium, hearing, sight, smell, taste; confined to the head and are highly localized, either housed within complex sensory organs or within distinct epithelial structures
  13. Cutaneous Sensations
    include tactile sensations (pressure, stretch, touch, vibrations), thermoreceptive sensations, and pain
  14. Punctate Distribution
    unequal distribution of receptors
  15. Pacinian Corpuscles
    largest of the corpuscular receptors and are found deep in the dermis and respong to strong deep pressure when it is first applied and then adapt rapidly
  16. Merkel Discs
    consist of free dendritic endings associated with enlarged. disc-shaped epidermal cells
  17. Root Hair Plexuses
    free dendritic endings that entwine hair follicles like a basket and detect the bending of hairs and adapt rapidly
  18. Meissner's Corpuscles
    small receptors consisting of a few spiraling dendrites wrapped in Schwann cells and CT
  19. Krause's End Bulbs
    mechanoreceptor found in the CT of the mucosae (mouth and conjunctiva of the eye) and in the hairless skin near body openings (lips)
  20. Ruffini's Corpuscles
    consist of numerous dendritic endings enclosed in a flattened capsule; located in the dermis, subcutaneous tissue, and joint capsules and respond to deel and continuous pressure and adapt slowly
  21. Nociceptors
    naked or bare dendritic endings that detect pain
  22. heat receptors
    receptors are most sensitive to temperatures above 25C and become unresponsive at temperatures above 45C; if temp goes above 45, pain kicks in
  23. cold receptors
    receptors that are most sensitive to temperatures between 10C and 20C; if temp drops below 10C, pain kicks in
  24. gustation
  25. olfaction
  26. How many taste buds do we have?
    about 10,000
  27. Olfactory Epithelium
    olfactory receptor cells line the roof of the nasal cavity forming a yellow-tinged patch of pseudostratified epithelium
  28. Color Deficiency
    absence or deficiency of one or more of the cone pigments results in the inability to perceive that color
Card Set
Physiology of Sensations
AFF gannon university lab practical one