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 central nervous system : brain and spinal cord

peripheral nervous system : 

Brain Anatomy and How the Brain Works | Johns Hopkins Medicine 

src : johns hopkins medicine

cerebellum : helps in learning new things

cortex :  4 lobes

frontal lobe : times action and control movement


parietal lobe : sensory touch information


temporal lobe : auditory information , memory 


occipital lobe : visual information from eye  


Brain Basics: What Part of the Brain Controls Thinking?

src: mindvalley blog

limbic structure  : emotion, learning,memory of animals

What Is The Limbic System? Definition, Parts, And Functions

hippocampus : forming new memory , patient H.M

amygdala : fear and anxiety

hypothalamus : flighting,fighting,feeding,fucking

pituitary gland :

spinal cord: 90% cells are glia(glue), 

astrocytes: star shaped cells



average human 100 billion neurons

each 10,000 connections to other called synapses

A Helpful Guide To Neuron Anatomy With Diagrams 

src : simple psychlogy

Santiago Ramón y Cajal 


neuron is either on or off , resting potential, communicate through ions , positive ions outside 

on receiving neurotransmitter at dendrite through synapse neuron allows charge to flow in once charge inside reach action potential axon hillock allows charge to flow through axon to axon terminal where it activates vesicles contining neurotransmitter

some neurotransmitters



neuromuscular junction




reuptake : proton pump , reform vesicles i.e take back neurotransmitters


measured in breakdown products in urine etc, cant be measured directly


same neurotransmitter can activate different compartments of brain


presynaptic and postsynaptic cell

memory and knowledge happens in synapse


synapse, the site of transmission of electric nerve impulses between two nerve cells (neurons) or between a neuron and a gland or muscle cell (effector). A synaptic connection between a neuron and a muscle cell is called a neuromuscular junction. 


hebbian plasticity

repetition drives memory

Long-term potentiation (LTP)

 hippocampus is site of memory 

 severe LTP causes PTSD

ethanol disrupts LTP



noise in neurons

interaction of many neurons (100 billions) 

temporal inhibition

spatial inhibition : send signal to neighbour 

pain sensation

sharp pain, dull throbbing pain

visual stimuli

edge,contrast detection 

hubel and wisel









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