PSY290H5 Lecture Notes - Lecture 3: Multipolar Neuron, Unipolar Neuron, Respiratory Tract
Notes: Microanatomy
1st Hour
● Test structure
○ SA
■ 3-4 QUESTIONS
● One Q per lecture
○ Fill in the blank section
■ diagrams
○ All sections can have diagrams
■ Lec 2 and Lec 3 as guides for anatomical views
○ 30+ MC
○ 1hr and 30 minutes test
○ 1-3 lectures will be tested
■ Only be assessed on material presented in lecture
● Neuron Doctrine
○ Neuron is the fundamental unit of behavior
● Neurons are classified into three principle types
○ Multipolar neuron
■ Many dendrites extending from the cell body
● Found in the Input Zone
■ Single axon
● One long branch
■ Most abundant type of neuron in brain
○ Bipolar neuron
■ Single dendrite extending from the cell body
■ A single axon
■ Appearance
● One extension from either side of the cell body
○ Unipolar neuron
■ Has a single branch that extends in two directions from the cell body and
serves as both a dendrite and an axon
■ Cell body
● In the conducting zone
■ One main extension from the cell body and then branches out into 2
○ All neurons have the same 4 functional zones
■ Input zone
● Neurons collect and integrate information either from the
environment or from other cells
■ Integration zone
● Where the decision to produce a neural signal is made
■ Conducting zone
● Where information can be transmitted over great distances
■ Output zone
● Where the neuron transfers information to other cells
● Done via axon terminals
● Golgi-stained Pyramidal and Stellate Neurons
○ Cortical Pyramidal Cell
■ Involved in excitation in our brain
■ Cell body looks triangular (pyramidal)
■ Abundant in the brain
○ Cortical Stellate Cell
■ No single branch that is prominent
■ Many branches are there
■ Several dendrites that radiate from the cell body
■ Prominent role in inhibitory role in our brain
○ 80% or more neurons involved in excitatory
■ 20% involved in inhibitory
● Top Hat Question
○ Answer is A
■ Several dendrites from the cell body
■ Single distinct extension from one end
Document Summary
Lec 2 and lec 3 as guides for anatomical views. Only be assessed on material presented in lecture. Neuron is the fundamental unit of behavior. Neurons are classified into three principle types. Many dendrites extending from the cell body. Most abundant type of neuron in brain. Single dendrite extending from the cell body. One extension from either side of the cell body. Has a single branch that extends in two directions from the cell body and serves as both a dendrite and an axon. One main extension from the cell body and then branches out into 2. All neurons have the same 4 functional zones. Neurons collect and integrate information either from the environment or from other cells. Where the decision to produce a neural signal is made. Where information can be transmitted over great distances. Where the neuron transfers information to other cells. Several dendrites that radiate from the cell body. Prominent role in inhibitory role in our brain.
