nervous sytem anatomy Flashcards
what is the central nervous system?
brain and spinal cord
what end of the spinal cord forms the three primary brain vesicles?
superior
what are the adult structures from the primary brain vesicle?
cerebrum, diencephalon- thalamus and hypothalamus, midbrain, pons, cerebellum, medulla oblongata
what forms the cavities in the brain?
brain grows the embryonic vesicles fold over one another forming the cavities
what are cavities in brain?
ventricles
what are the ventricles connected too?
connected with each other and with the central canal of the spinal cord
what are the four ventricles?
lateral ventricles (1st and 2nd) in cerebral hemispheres
3rd ventricle in diencephalon connected to lateral from inter-ventricular foramen
4th ventricle in brain stem and cerebellum connected to 3rd ventricle from cerebral aqueduct
what do ventricles contain?
cerebrospinal fluid CSF
what are the functions of CSF?
supplies water and electrolytes
supplies nutrients (glucose)
removes waste
cushions against trauma
supports(reduces weight of brain)
characteristics of CSF?
formed from blood plasma(less protein)
continuously formed and regulated
formed by choroid plexus(tissue in roof of ventricle)
choroid plexus=ependymal cells
cells secrete CSF into ventricles
what are the meninges?
3 membranes surround brain in spinal cord
cover/protect/enclose CNS
three types of meninges?
dura mater
arachnoid mater
pia mater
what is the dura mater?
“tough mother”
most superficial menix
2 layers= periosteal layer+meningeal
dural sinuses blood filled space between two
form several partitions dural folds
what are the three dural folds?
falx cerebri- between L/R cerebral hemi
tentorium cerebelli tent over cerebellum
flax cerebilli- between/below crebellar hemispheres
what is the arachnoid mater
“spider mother”
deep to dura mater
spider-like web of c.t (support blood vessel)
CSF circulates in subarachnoid space below arachnoid mater
