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Brain development
The beginning
The beginning
The beginning
Spinal chord and PNS
Spinal chord and PNS
Migration of cells from spinal chord to periphery.
Development of motor neurons
Alignment of sensory and motor neurons (motor & proprioception)
Proper CPG and reflexes require proper development of local circuits
Anterior segments
Hindbrain
MidbrainMesencephalon
DiencephalonTelencephalon
Signaling cascades governCell differentiation & Migration
Eyes
Cortical layers
Glial fibers
Olfactory neurons
From sub-ventricular zone to olfactory bulb
Setting up the connections
Where and when should the axon grow?
Eyes to brain
Setting up topography…
Motor neurons to muscles
Setting up innervation
Cell death
Nerve growth factor
Cells are programed to die unless they get NGF….
Synaptic pruning - PNS
Competition among synapses
Synaptic pruning - CNS
Synaptic pruning - CNS
Occular dominance in a neonate monkey V1
Synaptic pruning is activity dependent
Hebbian learning
Synapses during development
Synaptic plasticity
Map space with inter-aural differences
Synaptic plasticity
Synaptic plasticity
Axonal projections from the Inferior Coliculus to the visual tectum shift.
This shift can only happen in young owls…
Critical periodsA developmental period with enhanced plasticity.
Imprinting
Critical periods
Bird song development
Critical periods
Critical periods
Innervation of primary visual cortex