CNS Structure And Function Flashcards
Function of the Thalamus
- Relay all sensory info EXCEPT Smell
- Provide Crude awareness
- Role in Arousal and Alert
- Initial Autonomic response of the body to Intense Pain
Dopamine is secreted by what kind of cells?
Most neurons in the Substantia Nigra
Second messengers
- Can have multiple fxns that deal w/ Channels OR Nucleus
- May stimulate GENES
- Alter Metabolism
- SLOW Response
What NT is ALWAYS Excitatory?
Glutamate
Lateral Geniculate body is used to relay what?
Visual
The Medulla Oblongata is located where?
The Hindbrain
ACh are secreted by what kind of cells?
- Pyramidal cells
- Alpha Motor Neurons
- Postganglionic Neurons of the para/sympathetic system
- Some Neurons in the Basal Neuclei
(PAPS)
Na+ is an _____ Cation channel and Cl- is a _____ Anion channel.
- Excitatory
&
- Inhibitory
Glutamate is secreted by what kind of cells?
- Sensory pathways entering the CNS
- Cerebral Cortex
How long is the Synaptic delay?
0.5 milliseconds
Ventral Geniculate body is used to relay what?
Taste
Glycine is secreted by what kind of cells?
Synapses in the Spinal cord
What does Synaptic delay depends on?
- Time to release NT from Pre-syn
- Diffusion across the cleft
- Change in permeability
- movement of ions
Indirect Activation of ion channels usually involve what?
G-Proteins
- Slower activating
Is Dopamine usually excitatory or inhibitory?
Usually Inhibitory
Is ACh usually excitatory or inhibitory?
Excitatory
GABA is secreted by what kind of cells?
Many areas in the
- Spinal cord
- Cerebral cortex
What is Synaptic Delay?
- The time it takes to transmit a signal from a PRE-synaptic Neuron to a POST-synaptic Neuron
Norepinephrine is secreted by what kind of cells?
- Neurons Located in the Brain Stem and Hypothalamus
- PONS
- Postganglionic Neurons of the sympathetic system
Electrotonic Conduction
- Direct spread of Electrical current by ion conduction in dendritic fluid
- Does NOT generate an AP
Is Norepinephrine usually excitatory or inhibitory?
Can be EITHER!
Medial Geniculate body is used to relay what?
Auditory
T/F: Dendrites generally CAN transmit AP
False
Much of a dendrites potential is lost because of what?
Leakage
Ligand gated Ion channels characteristics
AKA Ionotropic
- Receptors also fxn as Channel
- Rapid Signaling
- Inactivated when ligand in Unbound
Major Slow Acting NT
- Calcitonin
- Oxytocin
- Bradykinin
- Substance P
- Neurotensin
- Vasopressin
- Carnosine
COBS N VC
Role of the Limbic system
- Emotional behavior
- Olfactory senses
Hypothalamus characteristics
- Size of almond
- Connects nervous system to Endocrine (Via Pituitary)
- Involved in Behavior
- Involved in metabolic regulation
What NT are ALWAYS Inhibitory?
GABA
&
Glycine
