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29 Cards in this Set

  • Front
  • Back
What does the nervous system do and what are its 2 classifications?
It makes everything work! Central Nervous System and Peripheral Nervous System
What is the Central Nervous System and what does it consist of?
Everything contained w/i the cranial vault and spinal cord including the brain, cerebellum, cerebrum, brain stem, diencephelon, basal ganglia...
What is the Peripheral Nervous System and what does it consist of?
All of the nervous system outside of the brain and spinal cord- Cranial nerves, cerebral blood system...
What is the calvaria?
the skull cap
What are the 3 bones that the outside calvaria is made up of?
Frontal bone
Parietal bone
Occipital bone
What suture connects the frontal and parietal bones together anterior/posteriorly?
The Coronal Suture
What suture do both sides of the Parietal bones connect?
Sagittal Suture
What is the suture that the occipital and parietal bones connect?
Lambdoid suture
Describe the inside calvaria?
On either side of midline- there are round pits called arachnoid granulations and granular foveolai for the granulations- indents that accomodate blood vessels, arteries, and veins- 2 ridges (sulcus) form valley from anterior to posterior (superior sagittal sinus)- essentially smooth
What does the cranial vault consisted of?
Top half- calvaria
Bottom half- posterior cranial fossa, middle cranial fossa, and anterior cranial fossa
What are the 3 sections (fossae) of the boney internal structure?
Posterior Cranial Fossae
Middle Cranial Fossae
Anterior Cranial Fossae
Describe the Anterior Cranial Fossae.
It's mainly in the frontal bone- rest in sphenoid bone- contains ethmoid bone and crista galley
Describe the Ethmoid bone.
has perforations (lacey) for neural fibers- used for smelling
Describe the Middle Cranial Fossae.
Found in the remainder of the sphenoid bone- cuplike area (Sella Tursica)- pituitary gland rests here- also in parietal bone, temporal bone- Internal auditory canal runs through it
What is the 8th Nerve?
the auditory nerve
Describe the Posterior Cranial Fossae.
Very large- In parietal bone, posterior temporal bone, clinoid process, spheniod bone (posterior to cella torsica), and occipital bone- smooth surface w/ 2 hemispheresof cerebellum, brain stem, and occipital bone
Where does the brain stem become the spinal cord?
Foramen Magnum
What is the importance of the foramen magnum?
Great hole where the brain goes when it swells- brain stem squishes thru here
What is the Jugular Foramen?
where the jugular vein (sigmoid sinus) leaves the brain to the neck
What is the foramen lacerum?
Where the carotid artery goes into the cranial vault for brains blood supply
What sense is the Anterior Cranial Fossae used for?
What are the surfaces of the anterior and middle cranial fossae like?
Very rough, spiney, boney projections
Why is the surface of the brain important to head injuries?
the brain can catch/snag on the projections housed in the fossate (anterior 1/3 of temporal lobes)
What do the temporal lobes snag?
Calvaria projections
Where is the anterior cranial fossae found?
Anterior/inferior frontal lobes and temporal lobes
How much does the brain weigh?
3 lbs- 2% body weight
uses 25% of bodies Oxygen supply and 20% of blood supply
What is the brain made up of?
a variety of Neural cells (10-14 billion cells)- each cell makes contact with 5000-50000 cell neighbors
What happens when the brain doesn't stay in balance of giving off waste products?
It's toxic!
How long till there is brain damage when no blood nourishes the brain?
10 seconds- lose consciousness
20- brain damage
2-3 minutes-permanent brain damage