Biology 251: Lecture 8Fall 1996

Nervous System II

  1. Sensory System: Sensillum (-a)
    1. Function
    2. General structure
      1. Sensory neuron
      2. Accessory cells

  2. Sensory System: Receptor types
    1. Mechanoreceptors
      1. Trichoid sensilla
      2. Campaniform sensillia
      3. Hair plates
      4. Chordotonal sensilla (= scolopidia)
        1. Johnston's organ
        2. Tympanic organ
        3. Subgenal organ
    2. Chemoreceptors
      1. Generalist receptors vs specialist receptors
      2. Uniporous receptors vs. multiporous receptors
    3. Photoreceptors
      1. Compound eyes
        1. Ommatidium (-a)
          1. Cornea
          2. Crystalline cone
          3. Rhabdom
          4. Retinula cell
        2. Pigment cells
        3. Apposition receptors vs. superposition receptors
      2. Simple eyes
        1. Ocelli
        2. Stemmata
    4. Thermorecepetors
    5. Hygroreceptors
    6. Magnetoreceptors


"A journey of a thousand miles must begin with a single step."
Lao-Tsu