Cat Bipolar cb2 (na1 or na2, CBa1, ?, ?)

References

• Postsynaptic connections (Input)
  • Cone Photoreceptor
    • McGuire, Stevens and Sterling (1984)
      • At least 3 flat synaptic contacts with 1 cone.
  • Horizontal Cell
  • Amacrine Cell
  • McGuire, Stevens and Sterling (1984) - sublamina A inputs
    • AII (12,12 synapses or 43%,29% of sub A inputs)
    • Reciprocal synapse with Unkown Amacrine (2,3 synapses or 7%,7% of sub A inputs)
    • Non-reciprocal synapse with Unkown Amacrine (14,26 synapses or 50%,64% of sub A inputs)
    • Totals: Cell #1 = 28, Cell #14 = 41

• Presynaptic connections (Output)
  • Amacrine Cell
    • McGuire, Stevens and Sterling (1984) - sublamina A outputs
      • AII (12,15 synapses or 18%,29% of sub A inputs)
      • Reciprocal synapse with Unkown Amacrine (1,1 synapses or 1%,2% of sub A inputs)
      • Non-reciprocal synapse with Unkown Amacrine (10,4 synapses or 15%, 8% of sub A inputs)
      • Amacrine Totals: Cell #1 = 34%,24 Cell #14 = 39%,20
      • Totals: Cell #1 = 69, Cell #14 = 50
    • Kolb and Nelson, 1984
      • A8
  • Ganglion Cell
    • McGuire, Stevens and Sterling (1984) - sublamina A outputs
      • Dark (probably Off-Beta/X) (19,8 synapses or 28%,16% of sub A inputs)
      • Pale (probably Off-Alpha/Y) (9,12 synapses or 13%,23% of sub A inputs)
      • Ganglion Cell Totals: Cell #1 = 41%,28 Cell #14 = 39%,20
      • Totals: Cell #1 = 69, Cell #14 = 50
    • Off Beta/X via ribbon synapses (Kolb and Nelson, 1993)

• Function
  • Presumably an off-bipolar (feeds off-ganglion cells) so hyperpolarizes to light
  • Karschin and Wassle (1990): "Light responses typically consist of graded and sustained potential changes of 20-25 mV from an average dark potential between -50 and -30 mV, without the occurrence of repeititive action potentials."

• Morphology
  • Kolb, Nelson and Mariani (1981)
    • 30-80 um dendritic span - wide-field
    • Axon is typically a single process leaving the soma
  • McGuire, Stevens and Sterling (1984)
    • soma 8.8 x 11 um
    • Single dendrite split into several branches in the outer plexiform layer.
    • Primary dendritic diameter 1.1 um
    • Primary axon diameter 1.4 um
    • Makes contacts in sublamina a

• Array characteristics

• Compartmental Model Characteristics

• Location
  • Kolb, Nelson and Mariani (1981)
    • processes in S1/S2 border of sublamina a of the IPL.
  • McGuire, Stevens and Sterling (1984)
    • soma in the middle of the INL.
    • Axon stratification in S1 and S2 of the IPL.

• Subclasses

• Synapse types

• Synapse Receptors

• Neurotransmitters
  • Does not accumulate glycine. Cohen and Sterling '86

• Immunoreactivity

• Nomenclature
  • Kolb et al '81 named it cb2
  • They equated it to the "smooth" flat cone bipolar of Boycott and Kolb '73
  • McGuire et al '84 equated cb2 to their CBa1 and to Famiglietti '81s na1 or na2

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