Morphology Of The Opl And IPL (Em)
17 Questions
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P. 156-158
Questions and Answers
- 1.A cone pedicle has more invaginations than a rod spherule.
- A.
True
- B.
False
- 2.Describe the post synaptic cell arrangement in cone ribbon synapses.
- 3.In cones, the invaginating synapses are involved in the ___ pathway and the flat synapses are involved in the ___ pathway.
- A.
Off; on
- B.
On; off
- 4.Rods typically have more than 1 central process.
- A.
True
- B.
False
- 5.In cone ribbon synapses, the horizontal cells are NOT connected by gap junctions.
- A.
True
- B.
False
- 6.Gap junctions:
- A.
Connect all photoreceptors to each other
- B.
Electrically couple photoreceptors
- C.
Are found between horizontal cells in rod ribbon synapses
- D.
2 of the above
- E.
All of the above
- 7.Adherent junctions are made of ___ gap junctions which are made of _______ (protein)
- A.
1; connexins
- B.
3; microtubules
- C.
3; connexins
- 8.How many different BPs are there in primates?
- A.
1
- B.
5
- C.
7
- 9.Diffuse BPs contact ____ cone(s) and midget BPs contact ____ cone(s)
- A.
Many; 1
- B.
1; many
- 10.Indicate the types of IPL synapses.
- A.
Conventional dyad
- B.
BP-BP
- C.
Amacrine-amacrine
- D.
Reciprocal
- E.
Reverse
- F.
Serial
- 11.What are the first and second most common IPL synapses in primate?
- A.
1. amacrine-amacrine; 2. conventional dyad
- B.
1. conventional dyad; 2. amacrine-amacrine
- C.
1. conventional dyad; 2. serial
- 12.In an amacrine-amacrine synpase; one BP synapses with one amacrine which then synpases on another amacrine
- A.
True
- B.
False
- 13.A serial synapse in the IPL allows for:
- A.
Informational integration
- B.
Information amplification
- C.
Information refinement
- D.
2 of the above
- E.
All of the above
- 14.In a reciprocal synapse in the IPL, information can flow both ways between a BP and a GC
- A.
True
- B.
False
- 15.Cats have ___ GCs and primates have___.
- A.
2;3
- B.
3;2
- C.
3;3
- 16.Which type of GC has the largest dendritic spread, axon diamter and cell body?
- A.
Alpha
- B.
Beta
- C.
Gamma
- 17.Which type of GC has the smallest dendritic spread?
- A.
Alpha
- B.
Beta
- C.
Gamma
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