Case 12 Flashcards
(343 cards)
4 central dopamine pathways
Mesocortical - VTA to PFC
Mesolimbic - VTA to NAc
Nigrostriatal - Substantia Nigra to Striatum
Tuberoinfundibular - Hypothalamus to Pituitary
Components of limbic system
Hippocampus
Cingulate gyrus
Hypothalamus
Anterior thalamic nuclei
Function of limbic system
Cortical control of emotion
Storage of memory
Function of prefrontal cortex
Planning and executing actions
PFC and limbic system are connected by
Cortical-Subcortical-Cortical loops
Connections between PFC and Limbic system are affected by…
Major depressive disorder
Schema
Pattern of negative thoughts
about self, the world, and the future
Biased attention
Negative views about self
Biased processing
Negative views about the world
Biased memory
Negative views about the future
Areas of the brain which have increased activity in depression (increased metabolism)
Hippocampus
Amygdala
Thalamus
Areas of the brain which have decreased activity in depression (decreased metabolism)
Prefrontal cortex
Dorsal Anterior Cingulate Cortex
Dorsolateral prefrontal cortex
Dorsal Vs Ventral Anterior Cingulate Cortex
Dorsal - Cognitive (connected to prefrontal cortex)
Ventral - Emotional (connected to amygdala and hippocampus)
Function of Ventrolateral PFC
Mediator of pain, aggression, libido and appetite
Function of Lateral-Orbital PFC
Mediator of maladaptive, perseverative mood states
Function of Dorsolateral PFC
Maintains executive function, sustained attention/concentration and working memory
(Hypoactive in depression - appear withdrawn)
Dopamine binds to…
D1 and D2 receptors
Noradrenaline binds to…
Adrenergic receptors
Excitatory and inhibitory neurotransmitters are… (fast/slow)
Fast
Exert effects in less than 1 millisecond
Modulatory neurotransmitters are… (fast/slow)
Slow
Take up to minutes but have longer lasting effects
Excitatory neurotransmitters
Glutamate
Dopamine (D1)
Noradrenaline
Adrenaline
Inhibitory neurotransmitters
Dopamine (D2)
Serotonin
GABA
Tyrosine Hydroxylase
Converts Tyrosine to L-DOPA
Requires Fe2+, O2 and BH4
Conversion of L-DOPA to Dopamine requires…
AADC enzyme
Vitamin B6 cofactor