CNS Flashcards
what comprises the CNS?
brain, spinal cord
where does the CNS lie?
withing the skull and vertebral canal?
what are the 3 meninges and what do they do?
dura mater, arachnoid membrane, pia mater, they provide functional protection- physical and chemical
what are the segments of the spinal cord
cervical, thoracic, lumbar, sacral, coccyngeal
what is the difference between white and grey matter in the spinal cord?
grey contains neuron cell bodies and some axons, white contains nerve axons
where is the dorsal horn(grey matter) and what does it contain?
posterior part of spinal cord, first-order afferent neuron terminals, and contains cell bodies of 2nd order sensory neurons
where is the ventral horn and what does it contain?
in anterior part of spinal cord, cell bodies of motor neurons, axons of motor neurons leave cord via ventral nerve roots
what part of the spinal cord has more white matter?
cervical and thoracic regions
what part of the spinal cord has more grey matter?
sacral and lumbar regions
describe the reflex pathway
stimulus-> sensory neuron -> inter neuron -> motor neuron -> response
where does grey matter surround white matter?
the brain
what are the 3 regions of the brain?
forebrain (cerebrum & diencephalon) midbrain and hindbrain (pons, medulla & cerebellum)
what is the function of the midbrain?
visual & auditory reflexes, pain control
what is the function of the hindbrain?
vital centres- breathing, heart, b.v, etc. - medulla, control of balance and posture - cerebellum
what are the 2 components of the diencephalon?
thalamus and hypothalamus
