Neuroscience of Communication: Chapter 7

White Matter Tracts, Protective Infrastructure and Brain Blood Supply

connectivity pathways of CNS

association vs commisural vs projection

whats white matter tract?

define each type

white matter pathways of the cerebrum are being recognized as key factors to understanding the expression of normal and disordered behavior

-the white matter forms the bases of those network connections, much like fiber-optic cabling forms the information transfer backbone of the Internet.

largest set of commissural fibers?

• whats corona radiata?

• whats internal capsule?

largest = corpus callosum. commissural fibers interconnect brain areas in the medial to lateral dimension

association is anterior to posterior

Within the cerebrum, though, corticopetal and corticofugal fibers congregate into two massive interconnected white matter structures:

• the internal capsule (IC) - ascending to descending nerve (Deep V)

• corona radiata - association

describes the meninges layers that protect the CNS

1. dura mater

2. arachnoid layer (with the subarchnoid space)

3. pia layer

dural folds function

what do they form

main function ? compartmentalization provides a strong and semi-stiff protective and supportive framework for the soft tissues of the cerebral and cerebellar hemispheres.

they form the falx cerebri, falx cerebelli, tentorium cerebelli

The falx cerebri (red) compartmentalizes the cerebral hemispheres (R/L)

the falx cerebelli (blue) compartmentalizes the cerebelar hemispheres.

The horizontaly oriented tentorium cerebeli (green) separates the cerebellum from the cerebrum

function of cerebral spinal fluid

viscosity, buoyancy, and slight positive pressure of the CSF operate to absorb and reduce the acceleration and deceleration forces experienced by the CNS

ventricles that are a system of interconnected chambers filled with CSF (4)

1. TWO lateral ventricles

2. 3rd ventricle

3. 4th ventricle

whats the difference btwn atrieal blood and venous blood

arterial - oxygen rich

venous - oxygen poor

oxygen consumption of the brain???

the vascular system..

aterial vs venous

describe the anterior circulatory system of the brain

common carotid artery contains internal and external carotid.

internal carotid divides into anterior cerebral , middle cerebral, and anterior chorodial artery

anterior cerebral leads to anterior communicating artery

middle cerebral leads to posterior communicating/posterior cerebral artery

describe the posterior circulatory system of the brain

SUBCLAVIAN ARTERY BABY

• these lead into the basilar arteries

• basilar arteries are superior cerebellar, anterior inferior cereballar and pontine arteries

• the pontine arteries have 3 subsections.

  • L and R (PCA),

  • postet inferior cereb arteries(PICA)

  • anterior spinal artery

what are the 4 venous sinues drains

1. superior saggital

2. inferior saggital

3. straight sinus

4. L/R transverse sinus **confluence

cerebral aneurysms are often asymptomatic and located usually on the ___

anterior and communicating arteries

internal carotid

posterior communicating

middle cerebral artery

symptoms of aneurysm

treatment?

bloom in artery wall

ischemicvs embolic stroke

sympotoms and treatment

gradual

history of cvd

hemorrhagic

symptoms and treatment

less common

sudden

doctor

arteriovenous malformations are ______ of small blood vessels.

what are the symptoms and treatment?

congiental tangled

symptom: seziers, migrains when moving

treatment: observe to surgery