Basic Neuroanatomy
Gage- 1838-survived- but was not Gage as b4
Personality changed- fitful-irreverent & profain
Localisation of Functions
specifc areas have specific functions
Broca & Wernike- lesions left hem = affected language
Parts of the brain
Major Divisons
Forebrain
Telencephalon
Most complex functions
Interprets Sensory Input
Initiates Voluntary Movement
mediates Complex Cognition
Cerebral Cortex
Ventricles & Fissures
Latteral Fissure
Longitudinal Fissure
Central Fissure
Corpus Callosum
Third Ventricle
Lateral Ventrical
Gyrus's - Lobes & Fissures
Precentral Gyrus
Central Fissure
Postcentral Gyrus
Superior Temporal Gyrus
Frontal Lobe
Parietal Lobe
Temporal Lobe
Occipital Lobe
Brodmann's Areas
Limbic System
Controls Motivated Behaviours
Feeding
Fighting
Fucking
Fleeing
Basal Ganglia
Controls Voluntary Motor Responses
Damaged in Parkinsons- Huntingtons & other movement control diseases
Diencephalon
Thalamus
multiple Nuclei
Sensory relays
Receive, Process & transmit to Sensory Cortex
LGN- Visual
MGN- Auditory
VPN- Somatosensory
Hypothalamus
Regulates Motivated Behaviours
Pituatry Gland
Hormone release
Mammillary Bodies
Hypothalamic Nuclei
Suprachiasmatic Nuclei
Biological Rhythms
Midbrain
Mescencephalon
Tectum
Inferior Collucilli
Superior Collucili
Tegmentum
Periaqueductal Gray
Substantia Nigra
Red Nucleus
Hindbrain
Myencephalon
Medulla (Oblongata)
Reticular Formation
Controls Nervous System
Cardiac
Circulatory
Respiratory Reflexes
Metencephalon
Pons Nuclei for several cranial nerves
Cerebellum Sensorimotor structure
Parts of Nervous system
CNS- central nervous system
PNS- Peripheral nervous system
Brain Protection
Layers of Protection
Scalp
Skull
Dura mater menynx
Arachnoid menynx
Subarachnoid space
Pia mater menynx
Cortex
Skull & 3 sheets of tissue(meninges)
Space filled with CSF- Cerebrospinal Fluid
Ventricles
Ventricles
Lateral Ventricle
Third Ventricle
Cerebral Aqueduct
Forth Ventricle
Central Canal
Cusions brain from Mechanical Shock
provides Buoyancy to support Brains Weight
Nutrition
Spinal Cord
grey matter
white matter
Central canal
Interactive Brain Online
Basic Neurophysiology
Certain Behaviours can be directly relates to individual neurons
deficiency in nutrition of neurons = Korsakoff's Syndrome
Alcohol abuse= changes structure of neurons
Anaesthetic drugs prevent tansmission of neurons
Glia- provides myelin sheath + helps conduction
Oligodendrocyte
Schwann cell
Astrocyte
Microglia
Neurons
Anatomy of Neurons
Cell Body
Dendrites
Nuclei
Axon Hilock
Axon
Myelin Sheths
Nodes of Ranvier
Buttons
Synapses
Neurotransmitters
Synaptic Transmission
Cell Membrane
Lipid Bilayer
2 layers of fat molecules
Numerous Protein Molecules
Classes of Neurons
Unipolar Neurons- one processes/connection to axon
Bipolar Neuron- two processes/connection to axon
Multipolar Neuron- many processes/connection to axon
Multipolar Interneuron- no axon
Resting Membrane Potential--70mV
=difference in voltage inside & outside cell
K+ & Protein-=inside
Na+ & CI- =outside
neuron potention 70mV less than outside
ions in Polarized state
Maintaining Resting Potential
Charge try to equalise
+out -in
2 factors working against each other
Na/K pump transports in + out
Concentration of Na/K pushes some through cell membrane
Generation of Potentials- EPSPs & IPSPs
chance of action potential dependant on amount & charge of neurotransmitter
Excitatory Post Synaptic Potential
Inhibitory Post Synaptic Potential
Generation of Action Potential
generated at Axon Hillock
Effect of post synaptic potentials
Voltage-activated ion channels
Na+ gates enter faster then K+ exits
Na+ gate closes- K+ gate opens wide
Conduction of Action Potential
Nodes of Ranvier regenerate action potential to conduct the singnal along the Axon
Neurotransmitters
The Process
Neurotransmitter Presursons
Synthesizing Enzymes
Vesicle
Degrading Enzymes
Vesicle fuse with presynaptic membrane
Neurotransmitter is released into Synapse bind with postsynaptic receptors
autoreceptors inhibit more NT release
neurotransmitter deactivated by reuptake or enzyme degradation
Types of Neurotransmitters
Classes
Amino acids
Monoamines
Soluble Gases
Acetylcholine
Neuropeptides
Each class either Excite or Inhibit
Drug effect on neurotransmitters
Mimic
Block
Increase
Agonistic Drug effect
Antagonistic Drug effect
Drug Examples
Cocaine
monoamine agonist
Increases Dopamine & Norepinephrine
Blocks reuptake from synapse= continually activates postsynaptic receptors
Effects= Euphoria- loss of appetite & insomia
Curare
used for anastetics to relax muscles
acetylcholine antagonist
binds to nicotinic receptors
Blocks transmission at neuromuscular junctions
Effects= paralysis & death thru lack of respiration
lec 3 and 4
Sensory & perceptual systems
Lecture3.pdf
Organisation of Motor system
Lecture4.pdf