Biomed mod.12 obj.14-17

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jnikrap
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194531
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Biomed mod.12 obj.14-17
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2013-01-22 23:38:59
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Biomed mod 12 obj 14 17
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Biomed mod. obj. 14-17
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  1. The brain is covered by a three layered bag that spans from the skull to the surface of the brain.  these layers are collectively called the _________.
    meninges (singular meninx)
  2. What are the three layers of the meninges?
    • Dura mater 
    • Arachniod mater
    • Pia mater
  3. Dura mater
    • Latin: "tough mother"
    • a leathery covering
  4. Arachnoid mater
    • "spiderweb mother"
    • resembles a wet spiderweb
    • is normally filled with cerebrospinal fluid (CFS)
  5. Pia mater
    • "delicate mother"
    • like a coating of paint on the surface of the brain, which cannot be sparated fron the substance (parenchyma) of the brain.
  6. epidural space
    space between the skull and the dura
  7. subdural region
    region between the dura and arachnoid
  8. subarachnoid space
    space between the arachnoid and the pial surface of the brain
  9. Patients who suffer bleeding into the brain may have blood collecting in the ______ space; tearing apart the ______ region; or filing up the __________ space.
    epidural, subdural, subarachnoid
  10. Ventricles
    Hollow spaces in the brain
  11. Cerebrospinal fluid (CSF)
    • Located in the ventricles and subarachnoid space
    • A filtrate of blood plasma that cushions and supports the brain.
    • supply's a favorable environment for nearons
  12. The ventricles include :
    • Lateral ventricles
    • third ventricle 
    • fourth ventricle
  13. Lateral ventricles
    Shaped like the letter C with a tail.

    are located beneath the white matter of the cerebral cortex.

    there is no first and second ventricles but there should be.
  14. The third ventricle
    a slit-like space between the two eggs of the thalamus
  15. The fourth ventricle
    between the brainstem and he cerebellum
  16. The ventricles are connected to each other by ________.
    apertures 
  17. Interventricular foramina
    connects the lateral ventricles and the third ventricle
  18. The third and fourth ventricles are joined by the ______ _______.
    cerebral aqueduct
  19. The fourth ventricle communicates with the subarachnoid space surrounding the ____ and _____ _____ via three apertures: two lateral apertures and a single ______ aperture. 
    brain, spinal cord, median
  20. Choroid plexus
    • where cerebrospinal fluid (CFS) is made
    • A special tissue tha is found mainly in the lateral ventricles and fourth ventricle
    • There the blood is filtered by ependymal cells, a type of glial cell.
  21. CFS is almost identical to ______; it is slightly _____ in glucose and amino acids than plasma, and much lower in ______.
    plasma, lower, protein
  22. _______ circulates ans is turned over about four times a day. Because of this circulation, a _______ puncture may detect bleeding that originated (for example) in the subarachnoid _______ around the frontal cortex.
    CSF, lumbar, space
  23. Arachnoid villi
    • a collection of structures along the midline of the superior aspect of the skull.
    • The resorption of CSF is thought to occur here
  24. Summary:

    CSF Production, Circulation, and Resorption
    • Production: choroid plexus
    • Circulation:
    •    -Lateral ventricles (cortex and basal nuclei)
    •    -Third ventricle (thalamus)
    •    -fourth ventricle (cerebellum and pons)
    •    -subarachnoid space of spinal cord
    •    -Subarachnoid space of brain
    • Resorption: arachnoid villi
    •    -dumped back into venous circulation
  25. True or false.
    The skull of an adult is capable of expansion.
    False.

    The skull of an infant is capable of expansion   an adults skull is bony and unyielding.
  26. If the ventricles or apertures become occluded in an adult, a life-threatening condition known as __________ occurs.
    hydrocephalus

    • Latin: "water-brain" 
    • It can also result from overproduction of CFS, or from slow absorption of CFS
  27. Blood Brain Barrier (BBB)
    • a collaboration between the lining of capillaries and the end-feet of astrocytes.
    • Keeps most substances in the bloodstream from entering the brain
    • Drugs must pass the BBB to affect the brain
    • If brain abscess developes, antibiotics have  difficulty crossing the BBB
  28. The area postrema
    • also called the "vomiting center"
    • small area of the medulla oblongata that has no BBB, which gives it access to any toxins or irritants which might be circulating in the blood.  
    • if it detects them, then it triggers emesis (vomiting) through the nearby vagus nerve
  29. True or False.
    The Blood-Brain Barrier can keep out drugs (particularly antibiotics) that we might want to use to help patients.
    True.
  30. Hypothalamus
    • Located just underneath the thalamus
    • intimately associated with the pituitary gland
    • contains dozens of small nuclei, clusters of brain cells that are responsible for a particular function
    • The Main control center for body homeostasis
  31. What are the homeostatic mechanisms for the body controlled by the hypothalamus?
    • Body temp
    • sexual function
    • eating
    • drinking
    • emotional state
    • circadian rhythms
    •    -activity levels related to time of day

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