brain Flashcards
function of cerebrum
primary motor and somatosensory cortex
function of cerebellum
subconscious coordination and control of ongoing movements of body part
function of thalamus
filters info passing only a small portion of arriving sensory info.
function of hypothalamus
maintain homeostasis of body
function of pituitary gland
master of endocrine system, releases hormones
brain stem ( two)
pons: voluntary control of respiratory
medulla: transmits info btwn spinal cord and brain for autonomic activities like breathing or heart rate
whats the function of the bones of the skull (protect, noruish and support)
protects from impact that can happen
whats the function of the cranial meninges (protect, noruish and support)
protect the brain, physical stability and shock absorption for the cns
whats the function of blood brain barrier (protect, noruish and support)
filter, protect delicate brain tissues
rich blood supple (protect, nourish and support)
gives energy for brain
difference btwn cranial and spinal meninges
-brain has 2 dural layers (periosteal and meningeal) and spinal only has one (meningeal)
-epidural space in brain doesn’t have nerves or tissues, spinal does
meningeal layers (DAP)
outer most: dura mater (periosteal and meningeal); tough (collagen fibres), fuses with the adventitia of blood vessels
middle: arachnoid mater- delicate, avascular (no blood vessels)
Inner layer: pia mater: anchored to brain tissue by astrocytes
epidural space
potential space in brain ( not visible)
real in spinal cord (visible)
subdural space
potential space in both brain and spinal cord
dural sinus
- channels that drain venous blood, where cerebrospinal fluid returns to venous circulation
subarachnoid space
real space that hold CSF
cerebrospinal fluid
cushions neural structures, supports brain and transports nutrients
-only has a little bit of protein and circulates circumventricular organs and in subarachnoid space
csf formed by what
choroid plexus (epndymal cells and specialized blood capillaries)
arterial blood (oxygenated)
blood goes to brain through common carotid arteries
venous blood (deoxygenated)
supplied by internal and external jugular vein, also dural sinuses
blood brain barrier
prevents proteins, toxins and viruses circulating in blood to enter brain tissues
structure: endothelial- tight junctions and lack of vesicular transport
astrocytes surround and help support tight junctions
where is BBB different compared to brain
pineal gland, portions of hypothalamus. posterior lobe of pituitary gland and choroid plexus
