unit 2 CNS Flashcards
at 4 weeks the human brain is made of 4 regions, what are they?
Forebrain, midbrain, hindbrain, spinal cord
the forebrain is differentiated into these two regions
cerebrum, dienchephalon
the hindbrain is differentiated into these 3 regions
Medulla oblongata, cerebellum, pons
Name the three layers of meninges from innermost to outermost
Pia mater, arachnoid membrane, dura matter
where is cerebrospinal fluid produced?
In the coroid plexuses found within each of the 4 ventricals
How does CSF get into the subarachnoid space?
through apertures in the 4th ventrical
how does CSF escape the subarachnoid space?
through arachnoid villi that protrude into the dural sinus
what are two defining characteristics of CSF when compared to plasma?
CSF has very low protein and no blood cells
The presence of blood or protein in CSF indicates what?
infection
what creates the myelin sheath within the CNS?
oligodendrocytes
________ wrap around capillaries and secrete paracrine factors that promote tight junctions within the CNS
astrocytes
Dural sinus is also called s_________ sinus
superior sagittal sinus
three metabolic quirks of neural tissues
- require a lot of oxygen
- require a lot of glucose
- require a lot of blood
the four sections of the spinal nerves
cervical, thoratic, lumbar, sacral
the sympathetic nerves on the spinal cord are located in a section for the spine called the _____
thoraco-lumbar division
definition of nuclei in the CNS
cluster of synapses
definition of tracts in the cns
bundle of axons