neuro: terms Flashcards
commisure
tract connecting one hemisphere to another
lemnisci
narrow strips of fibres
funiculi
rope/ cord
fasiculi
bundle
capsule
sheet of white matter fibres bordering a nucleus of grey matter
column
longitudinally running fibres separated by other structures (eg dorsal column)
cortex
laminated grey matter on outside of brain (eg motor cortex) (G)
nuclei
collections of nerve cell bodies within the CNS (eg arcuate nucleus) (G)
ganglia
collections of nerve cell bodies outside the CNS (eg dorsal root ganglia) and some inside the CNS that have a capsule (eg basal ganglia) (G)
afferents
axons taking information towards the CNS (eg sensory fibres) (G)
efferents
axons taking information to a site outside the CNS (eg motor fibres) (G)
reticular
‘netlike’, where grey and white matter mix (eg reticular formation of the brainstem
ipsilateral
same side
contralateral
opposite side
medial
towards midline
median
at midline
lateral
away from midline
rostral
towards nose (anterior)
caudal
towards tail (posterior)
dorsal in brain stem/ cord
posterior
ventral in brain stem/ cord
anterior
dorsal in cerebrum
superior
ventral in cerebrum
inferior
sulci (sulcus)
grooves
gyri (gyrus)
ridges
frontal lobe
- voluntary movement on opposite side of body
- frontal lobe of dominant hemisphere controls speech and writing
- intellectual functioning, thought processes, reasoning and memory
parietal lobe
receives and interprets sensations including pain, touch, pressure, size, shape and body part awareness
temporal lobe
understanding spoken words, sounds, memory and emotion
occipital lobe
understanding visual images and written words
where (roughly) is the white matter
underlying the cortex
thalamus
relay centre directing inputs to cortical areas (G)
hypothalamus
regulatory centre of temperature and water balance
cerebellum
coordinates movement and balance (W)
where is the cerebellum
lies over dorsal surface of brainstem attached by 3 peduncles (superior, middle and inferior)
what separates the cerebellum from the dorsal brainstem
4th (IV) ventricle
what is the cerebellum made up of (3 things)
folded cortex
white matter
deep inner nuclei
what 4 things can cerebral injury result in
asynergia (loss of coordination of motor movement)
intention tremor (movement tremor)
hypotonia (weak muscles)
nystagmus (abnormal eye movements)
asynergia
loss of coordination of motor movement
intention tremor
movement tremor
hypotonia
weak muscles
nystagmus
abnormal eye movements
colliculi
small swellings on the roof of the midbrain involved in vision and hearing
tectum
area of the midbrain responsible for vision and hearing reflexes
what is the tectum made up of
superior and inferior colliculi
peduncle
2 stalks at the front of the midbrain that attach the cerebrum to the brainstem
pons
bridge between cerebellum and cerebrum
where is the pons
above the medulla oblongata and below the midbrain
what are the 2 types of specialised cell in the CNS
neurones and glial (or neuroglial) cells
cerebrum function
controls voluntary actions
- learning
- memory
- personality
- conscious thought
cerebellum function
controls unconscious functions
- posture
- balance
- non-voluntary movement
medulla oblongata
used in autonomic control
- heart rate
- breathing rate
Association fibres
Axons which stay in one cerebral hemisphere (forebrain)
Projection fibres
White matter that connects the cortex with other areas in the CNS
Commisural fibres
White matter that connects the same cortical area in opposite hemispheres