After completion of this video session, it is expected that you will be able to List the four cranial parasympathetic ganglia: ciliary, pterygopalatine, otic...
Frontotemporal dementia is a rare disorder, related to Alzheimer's disease. Learn about frontotemporal dementia and Pick's disease causes, signs and symptoms and treatment and get support resources.
These are 2 flowcharts that I made to help me understand the basic blood supply to the brain and drainage via the venous sinus system. They don't go into huge detail, but rather give a general overview and schematic. Enjoy :P
Human brain. Volume rendered from T1 weighted MRI, an average of 27 scans (Colin27, Montreal Neurological Institute) and its conjunction with Brodmann a... Human brain Brodmann blend
The cerebrospinal fluid (CSF) is produced from
arterial blood by the choroid plexuses of the lateral
and fourth ventricles by a combined process of diffusion,
pinocytosis and active transfer. A small amount is
also produced by ependymal cells. The choroid plexus consists
of tufts of capillaries with thin fenestrated endothelial
cells. These are covered by modified ependymal cells
with bulbous microvilli. The total volume of CSF in
the adult ranges from140 to 270 ml. The volume of the
ventricles is about 25 ml. CSF is produced at a rate
of 0.2 - 0.7 ml per minute or 600-700 ml per day. The
circulation of CSF is aided by the pulsations of the
choroid plexus and by the motion of the cilia of ependymal
cells. CSF is absorbed across the arachnoid villi into
the venous circulation and a significant amount probably
also drains into lymphatic vessels around the cranial
cavity and spinal canal. The arachnoid villi act as
one-way valves between the subarachnoid space and the
dural sinuses. The rate of absorption correlates with
the CSF pressure. CSF acts as a cushion that protects
the brain from shocks and supports the venous sinuses (primarily the superior sagittal sinus, opening when CSF pressure exceeds venous pressure).
It also plays an important role in the homeostasis
and metabolism of the central nervous system.
The nervous system is composed of more than 100 billion cells known as
neurons
. A
neuron
is
a cell in the nervous system whose function it is to receive and transmit information
. As you can see in
Figure3.2, Components of the Neuron
, neurons are made up of three major parts: a cell body, or
soma
, which
contains the nucleus of the cell and keeps the cell alive
; a branching treelike fiber known as the
dendrite
, which
collects information from other cells and sends the information to the soma
; and a long, segmented fiber known as the
axon
, which
transmits information away from the cell body toward other neurons or to the muscles and glands
.
In my 2-Minute Neuroscience videos I simplistically explain neuroscience topics in 2 minutes or less. In this video, I discuss pain and the anterolateral sys...
