Neuroscience Brain Function

# Neuroscience Brain Function

## 1. Neural Signaling
AP propagation follows the all-or-none principle. Voltage-gated Na+ channels trigger depolarization, followed by K+ efflux for repolarization. Synaptic transmission involves exocytosis of NTs into the cleft, binding to post-synaptic receptors (ionotropic vs. metabotropic).

## 2. Synaptic Plasticity
LTP is the cellular basis of memory. NMDA receptor activation requires depolarization to remove Mg2+ block, allowing Ca2+ influx. This triggers kinase cascades, increasing AMPA receptor density at the synapse.

## 3. Cortical Architecture
Functional localization: 
- PFC: Executive function, impulse control, working memory.
- Hippocampus: Declarative memory consolidation.
- Amygdala: Emotional valence, fear conditioning.
- Visual Cortex (V1-V5): Hierarchical processing of sensory input.

## 4. Neuromodulation
Systems like the dopaminergic (reward/motivation) and cholinergic (arousal/attention) networks modulate global brain states, influencing the efficacy of local circuit processing.

## 5. Advanced Clinical Correlation
Neurodegenerative states often result from proteinopathy (e.g., Tau/Amyloid-beta) disrupting synaptic integrity, leading to cognitive decline. Understanding these pathways is critical for therapeutic development in CNS disorders.