Definitions Flashcards
what makes up white matter
myelinated axons
what makes up grey matter
cell bodies - no myelin sheaths
what are oligodendrocytes
myelinated axons in CNS
what are Schwann cells
myelinated axons in PNS
what is a tract
location of a pathway - axons gather in tracts
what is a commissure
tract connecting 1 hemisphere to another - cross midline
what is a lemniscus
narrow strip of fibres
what does funiculi mean
rope/ cord
what is a fasciculus
bundle
what is a capsule
sheet of white matter fibres that border a nucleus of grey matter
what is a column
longitudionally running fibres that separate other structures e.g. dorsal column
what is a cortex
Laminated grey matter on outside of brain
what is a nuclei
collection of nerve cell bodies within CNS
what is a ganglia
collection of nerve cell bodies outside CNS
what is the difference between nuclei and ganglia
collection of nerve cell fibres within CNS (nuclei) v outside CNS (ganglia)
what are afferent fibres
axons taking information towards CNS - sensory
what are efferent fibres
axons taking information to another site from the CNS - motor
what is reticular
‘netlike’; where grey/ white matter mixes
what is a nerve fibre
single axon
what is a nerve
bundle of fibres bound together by connective tissue
what is a cas a experiment
diagnosis - some bahvioural/ physiological/ pharmacological variable is manipulated, effet on brain activity/ structure are measured
what is a type b experiment
treatment
some aspect of brain structure or activity manipulated and effect on behaviour/ physiology etc measured
what are methods of detection of brain activity
neurotransmitters/ beakdown products detected in CSF
more O2 so more blood = modern imaging
EEF - indication of regional brain activity
describe the dorsal root strucutre
afferent
sensory
unipolar
cell bodies grouped in dorsal root ganglion
peripheral endings in sensory receptor
central processes end in dorsal horn of spinal cord
