PolyAxonal Amacrine PA2

References

• Postsynaptic connections (Input)
  • Wb/cb8 cone bipolar cells - Famiglietti '92 pg 427
    • This bipolar co-stratifies with the PA2 dendrites and putative contact is shown with light microscopy.
  • Ib ganglion cells - Famiglietti '92 pg 427
    • This ganglion cell (described in Famiglietti, '87) co-stratifies with the PA2 dendrites

• Presynaptic connections (Output)

• Function

• Morphology
  • Famiglietti '92
    • soma 9-14 um
    • dendrites
      • sparse branching
      • 10-20+ terminal branches
      • 1 um small spines and 3um long spines
      • "Both types of spine are more frequent in the proximal dendritic tree"
    • axons
      • 1-3 axons which arise from the soma or a proximal dendrite
      • all axons "are directed dorsalward toward the visual streak and/or medially toward the zero vertical meridian, both from temporal and nasal locations."
      • axonal field is at least 2-4 x larger than dendritic field and on par with the PA1, though sparser in branching

• Array characteristics

• Compartmental Model Characteristics

• Location
  • Famiglietti '92
    • soma displaced to the ganglion cell layer
    • dendrites
      • at the border of S4 and S5 of the IPL, "all class Ib ganglion cells (Famiglietti, '87), and wide-field type b (Wb) cone bipolar cells (Famiglietti, '81a) branch precisely at this level."
      • "sometimes partly bistratified, with a few dendritic branches in stratum 1."
    • axons

• Subclasses

• Synapse types

• Synapse Receptors

• Neurotransmitters
  • Somatostatin and/or substance P - Famiglietti '92 pg 423

• Immunoreactivity

• Nomenclature

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