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Chapter 15: The Nervous System
The Brain and Cranial Nerves
25
Anatomy
Undergraduate 1
12/09/2011

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Cards

Term
About how many neurons does the brain contain?
Definition
roughly 20 billion
Term
Telencephalon
Definition

CEREBRUM

  • paired cerebral hemispheres seperated by the longitudinal fissure
  • executive function
  • conscious thought processes, intellectual functions, memory storage and retrieval, complex motor patterns originate in the cerebrum
  • working memory, attention, problem solving, verbal reasoning

[image]

Term
longitudinal fissure
Definition
separates the two cerebral hemispheres
Term
Diencephalon
Definition
deep portion of the brain that connects cerebrum to brain stem[image]
Term
What are the 3 subdivision of the diencephalon?
Definition
  1. epithalamus
  2. right and left thalamus
  3. hypothalamus
Term
epithalamus
Definition
contains the hormone secreting pineal gland an endocrine structure
Term
thalamus
Definition
sensory information relay and processing centers
Term
hypothalamus
Definition
floor of the diencephalon; a visceral control center, coordination of endocrine system, emotions, autonomic function, hormone production
Term
pineal gland
Definition
regulates sleep-wake cycle, reduces libido
Term
Mesencephalon
Definition

MIDBRAIN

  • process visual and auditory information and coordinate direct reflexive somatic motor response to these stimuli
  • maintenance of conciousness
Term
Pons
Definition
  • inferior to the mesencephalon
  • contains nuclei involved in both somatic and visceral motor control
  • connects cerebellum to brain stem
  • [image]
Term
cerebellum
Definition
  • lies posterior to the pons and inferior to the cerebral hemispheres
  • planning, executive function
  • [image]
Term
flocculondular lobes
Definition
  • maitenance of balance and eye movements
  • proprioception
  • posture
  • [image]
Term
medulla oblongata
Definition
  • where the spinal cord connects to the brain stem
  • relays sensory information to the thalamus and to other brain stem centers
  • also contains major centers concerned with regulation of autonomic function, such as heart rate, blood pressure, and digestive activitoes
Term
ventricles of the brain
Definition
  • fluid-filled cavities within the brain
  • filled with cerebrospinal fluid and lined by ependymal cells
  • [image]
Term
interventricular foramen
Definition
no connection between lateral ventricles but both communicate with the diencephalon ventricle through the interventricular foramen
Term
Where is the 3rd ventricle?
Definition
diencephalon
Term
where are the first two ventricles? (lateral ventricles)
Definition
in either cerebral hemisphere
Term
Where is the fourth ventricle?
Definition
between the pons and cerebellum
Term
blood-brain barrier (BBB)
Definition
neural tissue in the CNS has an extensive blood supply, yet it is isolated from the general circulation; maintains a constant environment
Term
cerebrospinal fluid
Definition

completely surrounds and bathes the exposed surfaces of the central nervous system

 

Term
What are the 3 functions of cerebrospinal fluid?
Definition
  1. cushioning delicate neural structures
  2.  supporting the brain
  3. transporting nutrients, chemical messengers, and waste products
Term
choroid plexus
Definition
  • produces CSF at a rate of about 500mL/day
  • the entire volume of CSF is replaced roughly every 8 hours
Term
limbic system
Definition
includes nuclei and tracts along the border between the cerebrum and diencephalon
Term
What are the functions of the limbic system?
Definition
  1. establishment of emotional states and related behavioral drives
  2. linking concious, intellectual functions of the cerebral cortex with the unconcious and autonomic functions of other portions of the brain
  3. facilitating memory storage and retrieval
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