functional orgainsation of the brain and spinal cord Flashcards
Anterior name for brain
Rostal
FRONT
Posterior name for brain
Caudal
dorsal
top of brain
ventral
bottom of brain
Brainstem and spinal cord
Rostal at top and caudal at bottom
Functional divisions of brain (4)
Brainstem
Cerebellum
Dienephalon
Cerebrum
Brainstem
Medulla, pons, midbrain
Diencephalon
Thalamus and hypothalamus
Cerebrum
Cortex, amygdala, hippocampus, basal ganglia, white matter
Brain stem fibre tracts
sensory and motor functions via cranial nerves
sensory and motor function of body via spinal cord
Medulla function
CVS and respiratoyr control
Nuclei that relay info about taste, hearing, balance , control of neck and facial muscles
Pons function
Respiration, sleep, taste, bladder control, hearing, swallowing, taste, eye and facial movements, posture, facial sensation, nuclei that relay info about movement and sensation, major input to cerebellum
Midbrain function
Components of auditory and visual systems, auditory and visual reflexes
Pineal body of the brainstem
Regulation of the diurnal rhythms
Synthesise melatonin
Superior and inferior colliculi of the brainstem
Visual and auditory functions
Thalamus location
Alongside 3rd ventricle
Thalamus function
Essential for transfer of sesnsory info ( except olfaction)- nuclei in thalamus receive sensory info then relay to cortex
Gates and modulates sensory info
Involved in integration of motor control
Influences attention and consciousness
Cerebellum function
Maintaining posture, coordinating head and eye movements, fine tuning movements, motor learning
Hypothalamus function
Homeostasis and sexual reproduction
Growth, drinking, eating, maternal behaviors
Connected to pituitary gland =hormonal secretions
Cerebrum functions
HIGHER functions
Perceptions, motor planning, cognition, emotion, memory
Amygdala
Social behaviours and emotion
Hippocampus
Memory
Basal ganglia function
MOVEMENT control
Axons - white matter
Carry info to and from cortex, between structures
Lobes of the cortex
Frontal,parietal, temporal and occipital
Sulci vs gyri
Sulci = grooves Gyri= raised areas between grooves
Central nervous system
Brain , spinal cord
Peripheral nervous system
Cranial nerves -12 pairs in periphery
Spinal nerves - 31 pairs in periphery
Autonomic nervous system
Consists of sympathetic and parasympathetic divisions
2 neurone chain and ganglia
Cerebral arteries distribution
Anterior - motor and sensory cortex of the lower limb
Middle - motor and sensory cortex of upper limb and face and auditory cortex
Posterior - whole of visual cortex
What are watershed infarcts
Where territories overlap - arteries
Perfusion pressure too low - terminal branches loose supply
Central sulcus
Frontal from parietal lobe division
Cerebral cortex - 2 areas
Sensory cortex- somatosensory cortex, gustatory cortex, visual, olfactory, auditory , vestibular
FRONTAL LOBE =Motor cortex - supplementary motor cortex , primary motor cortex, premotor cortex
Brodmanns areas of the cerebral cortex
Different numbers
Anatomical distinction - cell body, cell type etc
How did we find out that different areas of the cereberal cortex have different functions
Post mortems Experiements Taking out certain parts of the brain Learning and memory - hippocampus new memories fMRI - wheres activity
Anterograde amnesia
Inability to make new memories
Somatomotor ns
1 somatic motor fiber
2 main blood supplies into the brain
Common arotid- internal cartoid- middle cerebral- anterior cerebral artery
Vertebral arteries -along brainstem- basilar artery along pons
VENTRAL SURFACE of brain
Middle cerebral artery
Lateral surface of frontal and parietal lobe
Occipital
Atnerior cerebral artery
medial part Frontal and parietal part
Posterior cerebral artery
MEDIAL PART Temporal lobe and occipital
main symptoms of a stroke - FAST
Face dropped
Arms weak
Speech slurred
Time - dial 999
2 types of strokes
Hemorrhagic- bleeding in brain
Ischemic( o2 deprived) brain tissue
Common site of stroke
MIDDLE CEREBRAL ARTERY
controlateral - left side of brain = right side of body
Limits of autoregulation of blood flow - above and below
BELOW- central blood flow decreases = ischaemic damage
ABOVE- intracranial pressure increases= oedema and crushigng of brain tissue, shifting of brain structures, restriction of blood flow and herniation
Local blood flow
Increases very quickly after neuronal excitation
Glutamate release - acts of astroctes- increase in calcium- activation of nitric oxide synthase - release of NO - dilation of vessels
Detecting changes in local blood flow
Functional MRI
Detect rapid changes
Changes in blood flow an alter the signal
Oxyhaemoglobin and deoxyhaemoglobin RATIO - react differently to magnetic flux
Can be used with vascular markers and contrasting agents eg gadolinium