Chapter 8 (nervous system)
What are dendrites?
Branching structures w/ cell body, are secreative to chemical manonical and sermical stimulation
What is the main job of the afferent division?
Bring sensory info to the CNS
What do the posterior horns of the spinal cord contain?
Sensory nuclei
What is the job of an ascending pathway?
Sensory receptors release info to process in brain
What part of the PNS brings info to the CNS?
Afferent division
What does all-or-none principal state?
All stimuli great enough to bring the membrane to the threshold will produce identical action potentials
What are the largest and most numerous of the glial cells in the CNS?
Astrocytes
What glial cells are responsible for maintaining the blood brain barrier?
Astrocytes
Neurons that have one axon and one dendrite with the soma between them are called what?
Bipolar neurons
What makes up the CNS?
Brain and spinal cord
What are collaterals?
Branches that sometimes occur along the length of an axon
The gray matter of the spinal cord is dominated by what?
Cell bodies of neuron and glial cells
What region of the brain is involved in conscious thought and intellectual function as well as processing somatic sensory and motor info?
Cerebrum
Name 2 places there are enlargements in the spinal cord
Cervical and lumbar regions
What is the primary connection between the cerebral hemispheres?
Corpus collasum
The thalamus is the largest portion of which major brain region?
Dicephalon
Is sending signals to the muscles an example of efferent or afferent division?
Efferent
Which neuroglial cells produce CSF in some regions of the brain?
Ependymal cells
What is the most sensitive body region?
Face
Is the nervous system fast or slow acting?
Fast
Changes in the membrane potential that cannot spread far from the site of stimulation are called what?
Graded potentials
What are some major autonomic functions of the medulla oblongata?
Heart rate regulation, blood pressure respirarion
The projections of gray matter extending through the white matter toward the outer surface of the spinal cord are called what?
Horns
Where are association areas?
Interpreting data and coordinating Motor response
If Broca's area is damaged, what might result?
Lack of speaking
What system establishes the emotional state?
Limbic system
The 2 cerebral hemispheres are separated by what?
Longitudinal fissure
What is amnesia?
Loss of memory as a result of disease or trauma
Small phagocytic glial cells, which are derived from white blood cells are called what?
Microglia
Most neurons in the brain are....
Multipolar
Neurons have 2 or more dendrites and a single axon extending away from the soma are called what?
Multipolar neurons
What is the PNS made up of?
Neural tissue outside of the CNS
During an EEG, when are alpha waves detected?
Normal resting adults
Where is the visual cortex of the cerebrum located?
Occipital lobe
The myelin sheaths that surround the axons of some of the neurons in the CNS are formed by what?
Oligodendrocytes
Where are interneurons found?
Only in the CNS
What is the job of the prefrontal cortex?
Performs intellectual functions, predict future convenience extensor actions
The neurilemma of axons in the peripheral nervous system in the outer layer of what?
Schwann cells
How many segments is the spinal cord divided into?
31
What are ganglia?
Bundles of CNS axons that share a common origin, destination, and function