Neuroscience Test 1

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ggarriott
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Neuroscience Test 1
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2011-06-13 00:09:14
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Neuroscience Test 1
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  1. Term used to describe the brain and spinal cord.
    Neuraxis
  2. The brain, brainstem, cerebellum, and spinal cord make up the __________.
    Central Nervous System (CNS)
  3. Consists of the cranial nerves and spinal nerves & is sometimes called the lower motor neuron.
    Peripheral Nervous System (PNS)
  4. Consists of peripheral nerve fibers that send sensory information to the central nervous system AND motor nerve fibers that project to skeletal muscle.
    Somatic Nervous System
  5. Self-regulating functioning; part of the PNS. It controls many organs & muscles within the body & functions in an involuntary, reflexive manner. (Breathing, HR, BP, etc.)
    Autonomic Nervous System
  6. 3 membranes that enclose the CNS.
    Meninges
  7. Tough, slightly elastic, outermost membrane that encloses the brain & spinal cord and lines the inner surface of the cranial vault.
    Dura mater (meninges)
  8. Which layer of dura mater is vascular & attaches to skull forming the periosteal layer of the calvarium.
    Outermost
  9. Inner surface of the dura is attached to the ________.
    Arachnoid
  10. Complex system of cavities and channels where the layers of dura separate; collect used blood (venous) flowing down from brain & funnel it into jugular for return to heart & lungs.
    Dural Venous Sinuses
  11. Long, crescent-shaped band of dura that slips downward along the midline of skull dividing cranial vault into 2 compartments (hemispheres)
    Falx Cerebri
  12. Dome-shaped sheet of dura mater creating 2 compartments: upper-holds the hemispheres & lower-holds the cerebellum.
    Tentorium Cerebelli
  13. Cobweblike sheet of tissue sandwiched bet/ the dura & pia mater. It has no blood vessels & doesn't conform closely to the contours of the underlying pia mater, thereby creating a space.
    Arachnoid
  14. Space in the arachnoid that is filled with CSF.
    Subarachnoid space
  15. Cerebrospinal Fluid (CSF)Clear, colorless fluid that serves what 3 functions?
    • Cushions & protects CNS against trauma
    • Transport pathway for metabolic/nutritional compounds to reach CNS & waste products away from CNS
    • Diagnostic medium
  16. Arachnoid protrusions into the venous sinuses that provide places at which excess CSF is resorbed into the venous blood & removed from the subarachnoid space.
    Arachnoid Villi (granulations)
  17. Fragile, innermost meninges layer adhering tightly to the brain's surface like shrinkwrap.
    Pia Mater
  18. Outer surface of pia mater has many _________ that cross the space between the pia mater and the arachnoid.
    Capillaries (blood vessels)
  19. An average human brain weighs about ___ pounds which is _____% of body mass and is _____% water.
    • 3 lbs
    • 2% body mass
    • 75% water
  20. The brain requires _____% of blood & oxygen.
    25%
  21. Permanent brain damage can begin to occur after ___ minutes of loss of oxygen to the brain.
    2
  22. These cells are the "bricks & mortar" supporting and separating nerve fiber tracts & are also "housekeepers" that regulate fluid levels, remove foreign substances & participate in brain metabolism.
    Glial cells
  23. Gial cells are _____ times more numerous than neurons & account for ____ of the brain's solid mass.
    • 5-10 times
    • 1/2
  24. What part of a neuron generates impulses?
    Cell body
  25. What part of a neuron collects impulses?
    Dendrites
  26. What part of a neuron is the conducting process of a nerve cell and carries impulses?
    Axon
  27. Fatty material that surrounds axons of neurons providing an electrical insulation and allows transmission of info to be faster.
    Myelin sheath
  28. Point at which the transfer of impulse from axon to dendrite from one neuron to the next. What's the tiny space where this happens called? What type of process is this?
    • Synapse
    • Synaptic cleft
    • Chemical process
  29. What type of neurons respond to stimulation such as touch or temperature and serve as receptors?
    Sensory neurons
  30. What are the "first order neurons" of the CNS known as the pyramidal system & is responsible for initiating control skilled, specific voluntary movements and inhibit reflexive innervation motor& are made up of motor neurons in the mortor cortex together with projection fibers?
    Upper Motor Neuron (UMN)
  31. The top-to-bottom "unit" responsible for direct innervation of specific skeletal muscle
    UMN
  32. Loss or damage to UMNs result in what effect on the body?
    Spasticity
  33. What tract of UMNs go from the cortex to the cranial nerves in the brainstem?
    Corticobulbar
  34. What tract of the UMNs go between the cortex to the spinal nerves of the spinal cord?
    Corticospinal
  35. Another name for PNS that consists of the cranial & spinal nerves that provide gross, crude, undifferentiated innervation of muscle. Where reflexive motor actions are mediated.
    Lower Motor Neurons (LMN)
  36. "Final common pathway" for motor commands going to muscle fibers
    LMN
  37. LMNs that exit the CNS
    ... below the cranium are called (_______ nerves
    …inside the cranium are called (_______nerves)
    • Spinal
    • Cranial
  38. Loss/Damage of LMN results in what effect on the body?
    Flaccidity
  39. Stimulation of a sensory nerve is transmitted to a motor nerve via what type of nerve cell activating the reflex arc.
    Interneuron
  40. Permits rapid responses/movements to stimuli (pain) w/out participation of higher centers of the nervous system.
    Reflex arc
  41. What matter consists of neurons and glial cells?
    Gray matter
  42. What matter consists of bundles of myelinated axons arranged into nerve fiber tracts.
    White matter
  43. What's the term for collections of interacting neurons whose function is closely related?
    Nuclei
  44. What are the major divisions of the brain?
    • Cerebrum
    • Deep Brain Structures (Ventricles, Diencephalon, Internal Capsule)
    • Brainstem
    • Cerebellum
  45. What deep fissure divides the cerebrum into 2 hemispheres?
    Longitudinal Cerebral Fissure
  46. Rigid sheet of dura mater that serves as a partitition w/in the longitudinal cerebral fissure & crosses front to back on the midline of the cranial vault.
    Falx Cerebri
  47. Rigid sheet of dura that horizontally separates the cerebellum from the base of the brain.
    Tentorium Cerebelli
  48. Convolutions/ridges of the brain's surface
    Gyri
  49. Depressions/valleys in the brain's surface
    Sulci
  50. Very deep sulci
    Fissures
  51. Prominent sulcus/fissure that travels vertically down each hemisphere dividing it into roughly equal anterior and posterior regions. (3 names for the same area)
    • Central Sulcus
    • Fissure of Rolando (marble roll on down)
    • Central Cerebral Fissure
  52. Deep groove that separates the temporal lobe in each hemisphere from the frontal and parietal lobes horizontally. (3 names)
    • Lateral Cerebral Fissure
    • Fissure of Sylvius
    • Frontotemporoparietal
  53. Less prominent deep groove in the occipital lobe of each hemisphere. It's important bec/ visual cortex is adjacent to it.
    Calcarine fissure (calx-heel)
  54. What are the 4 names of lobes of the brain?
    • Frontal (2)
    • Parietal (2)
    • Temporal (2)
    • Occipital (1)
  55. Anterior 1/3 of the brain involved in planning.
    Inferior boundary--Lateral Cerebral (Sylvian) Fissure
    Posterior boundary--Central sulcus (Rolandic fissure)
    Frontal lobes
  56. Part of cortex where sensory strip is located so is important for somesthic sensation (skin, muscle, joint, & tendon).
    Anterior boundary--Central sulcus (Rolandic fissure)
    Posterior boundary--Occipital pole
    Inferior boundary--Lateral (Sylvian) fissure
    Parietal lobes
  57. Bottom 1/3 of each hemisphere; important role in language & audition.
    Superior boundary--Lateral (Sylvian) fissure
    Inferior boundary--Midline underside of hemisphere
    Posterior boundary--Imaginary Occipital anterior boundary line
    Temporal lobe
  58. Most posterior portion of the brain hemispheres where the visual cortex is located.
    Superior boundary--Parietal lobe
    Anteror boundary--Occipital lobe's longitudinal fissure
    Occipital Lobe
  59. Patch of cortex folded into the Lateral (Sylvian) fissure; operculum surrounds it.
    Insula
  60. Which gyrus anterior to central sulcus is the motor strip located?
    Precentral gyrus
  61. Structure where we initiate specific, voluntary movements***
    Precentral gyrus
  62. Which gyrus posterior to central sulcus is the sensory strip located?
    Postcentral gyrus
  63. What are the superior, middle, and inferior temporal gyri responsible for?
    Listening
  64. What gyrus (curves around the end of the Lateral (Sylvian) fissure) is important for the process of writing?
    Supramarginal gyrus
  65. What gyrus (posterior to supramarginal gyrus/end of superior temporal gyrus) is important for reading?
    Angular gyrus
  66. Strip of brain cortex in the posterior frontal lobes said to be important for planning volitional movements.
    Premotor cortex
  67. Area of brain cortex responsible for reasoning, thinking, & planning.
    Prefrontal cortex
  68. In what gyrus is Broca's area located?
    3rd Inferior Frontal convolution/gyrus
  69. What term of the brain derives from "bark"?
    Cortex
  70. Largest & most important crescent-shaped commissure (structural bridge bet/2 hemispheres); responsible for interhemispheric communication.
    Corpus Callosum
  71. Major fiber tract in the left hemisphere that's considered the major pathway by which info from lang. centers in temporal lobe reach frontal lobe for conversion into spoken or written output.
    Arcuate fasciculus
  72. Integral gyrus of the limbic system which is involved with emotion formation and processing, learning, and memory.
    Cingulate gyrus
  73. The ventricles contain _____% of CSF; ____% in the subarachnoid space
    • 15%
    • 85%
  74. What are the 4 CSF filled cavities called ventricles within the brain?
    • Lateral (2)
    • Third (1)
    • Fourth (1)
  75. 2 largest crescent-shaped ventricles
    Lateral
  76. Irregularly-shaped disk-like cavity standing on the edge on the midline below the lateral ventricles
    Third ventricle
  77. Narrow tubular cavity extending down through the brain stem, ending at an opening into the subarachnoid space
    Fourth ventricle
  78. Clear, colorless fluid that fills the ventricles and surrounds the brain, brainstem cerebellum, and spinal cord
    Cerebrospinal Fluid (CSF)
  79. What are the 4 functions of CSF?
    • Protective (cushion)
    • Nutritive
    • Excretion (waste)
    • Diagnostic purposes
  80. Spongy masses of vascular tissue (capillaries), one in each ventricle, that are the body's primary producer of CSF; blood rich nutrients to CSF via these.
    Choroid Plexi (plexus)
  81. Short passageway bet/ each lateral ventricle & the third ventricle for movement of CSF
    Foramen of Munro (Interventricular foramen)
  82. Long narrow passageway bet/ third & fourth ventricles. Occlusion in this area is common cause of hydrocephalus.
    Aqueduct of Sylvius (Cerebral Aqueduct)
  83. 2 openings from the fourth ventricle into the subarachnoid space...also called Lateral aperatures.
    Foramina of Luschka (lateral aperatures)--"roof" of the fourth ventricle
  84. 2 openings from the fourth ventricle into the subarachnoid space...sometimes called the Median aperature.
    Foramen of Magendie "floor" of fourth ventricle
  85. Which foramen (2) empties the subarachnoid space?
    • Foramina of Luschka "roof"
    • Foramen of Magendie "floor"
  86. Deep central region w/in the brain hemispheres that contain the thalamus & basal ganglia. It plays an important part in the regulation & integration of motor activity & sensory experience.
    Diencephalon "Deep Brain"
  87. "Relay station" for all incoming sensory info; pair of egg-shaped nuclei in the diencephalon important for consciousness, alertness, attention, "appreciation" of pain. (may regulate overall activity of cortex)
    Thalamus
  88. Several nuclei in diencephalon near thalamus, responsible for regulation of major muscle groups that make postural adjustments & compensate for inertial forces during movement. Automatic background adjustments (Ex. walking on irregular sidewalk)
    Basal Ganglia
  89. Degeneration and fading of the ____________ (basal ganglia) is frequently seen in Parkinson's Disease.
    Substania Nigra
  90. Structures for regulating automatic, background adjustments
    Basal Ganglia
  91. Caudate nucleus, Putamen & Globus Pallidus (Lenticular Nucleus) make up what part of the deep brain?
    Basal Ganglia
  92. Major neural pathway for motor commands traveling from the cortex to:
    spinal nerves (________)
    cranial nerves (________)
    pons and cerebellum (__________).
    • corticospinal
    • corticobulbar
    • corticopontine (vestibulospinal)
  93. Region of highly compacted projection fibers deep in the cerebral hemispheres.
    Internal capsule
  94. Section of corticobulbar & corticospinal tracts that lies w/in the basal ganglia.
    Internal Capsule
  95. "Little Man"--drawing of a human figure showing topographic representation of motor cortex. Shows how many neurons are dedicated to a particular body part.
    Homunculus
  96. Stalklike structure at base of brain atop spinal cord containing centers that regulate vital functions & contains most cranial nerve nuclei.
    Brainstem
  97. Mesencephalon--deep brain region that makes up the upper 1/3 of the brain stem; contains several nuclei including cranial nerves that move the eyes.
    Midbrain
  98. Visual reflex processing (blinking)are mediated in this area of the midbrain.
    Superior Colliculi
  99. Auditory reflex processing (loud sound--> ossicles tighten) is mediated in this area of the midbrain.
    Inferior colliculi
  100. Prominent forward bulge of the middle 1/3 of brainstem containing 3 cranial nerve nuclei for eyes & face plus some nuclei concerned w/ balance & hearing
    Pons
  101. Hindbrain--bottom 1/3 of brainstem contains 5 cranial nerve nuclei plus centers (conerned with HR, vasoconstriction, breathing). Pyramidal decussation cross here.
    Medulla oblongata
  102. Structures in the central core of brainstem that regulate individual's overall level of consciousness.
    Reticular Formation
  103. Mini-brain lies beneath posterior temporal lobes. Important in integration & coordination of volitional movements
    Cerebellum
  104. Other than equilibrium and coordination, what other function is served by the cerebellum?
    Gamma system – (background muscle tone.)
  105. Structure for monitoring timing, range, and speed of movements.
    Cerebellum
  106. Projection fibers include what type of fibers?
    • afferent fibers
    • efferent fibers
    • (Both)
  107. Motor (______-______-_______)
    Sensory (______-______-_______) axons & cell bodies make up the spinal cord.
    • Motor--(Efferent-Anterior-Descending-DOWN)
    • Sensory--(Afferent-Posterior-Ascending-UP)
  108. Portion of the spinal cord that contains nerve cell bodies that transmit sensory information to the postcentral gyrus.
    Posterior Horn Cells
  109. "Up & Down" nerve fiber tracts that connect brain, brainstem, & spinal cord. Motor (efferent) or Sensory (afferent).
    Projection fibers
  110. "Across or Between" horizontal nerve fiber tracts that cary impulses from one hemisphere across to the other. Corpus callosum is the major tract.
    Commissural fibers (Commisures)
  111. "Within" hemispheric nerve fiber tracts connecting adjacent regions of the cortex. Arcuate fasciculus important for how brain deals with language.

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