Exam 14: The Brain and Cranial Nerves
Which of the following functional areas of the cerebrum is responsible for speech?
A
Which cranial nerve in the diagram has a somatic motor function primarily involved in moving the upper eyelid and eyeball?


C
In 1848,a railroad worker named Phineas Gage was seriously injured during an explosion on the job.A tapered metal rod ranging from 0.25 inches to 1.25 inches in diameter and over 3 feet long entered his skull just under his left cheek bone and exited through the top of his skull.The rod was found over twenty feet away.Amazingly,Gage lived even though he suffered massive damage to the left front of his brain.His personality and intellectual abilities changed,however.Before the accident,he was respected as a smart,capable and even-tempered man.After the accident,he was foul-mouthed and bad-tempered and could not make up his mind.In the years immediately preceding his death,he began to have epileptic seizures.Explain the changes observed in Mr.Gage based on your knowledge of the brain.
The accident apparently damaged the frontal lobe and specifically the prefrontal cortex of the left side of Mr.Gage's brain.The frontal lobe is involved in memory and intellect.The prefrontal cortex is involved in judgment,ethics,and conscious.The changes Mr.Gage experienced indicate that the right side of his brain could not compensate for the losses on the left side of the brain.It is remarkable that the story doesn't mention that Mr.Gage lost some motor function on his right side since it is controlled by the primary motor region on left side of the brain.There is also no mention of loss of speech,which is largely processed on the left side of the brain.Perhaps the iron rod just missed those areas.As far as the epileptic seizures are concerned,it is possible that the accident damaged the basal ganglia to some degree.As he aged and lost connections between neurons that damage might have become more evident as the basal ganglia could no longer communicate effectively with the rest of the brain.
Which cranial nerve in the diagram has an autonomic motor function primarily involved in the secretion of saliva and tears?


Patients with damage in the left hemisphere often exhibit aphasia (inability to use or comprehend words).This is an example of
Which three areas of gray matter found in each cerebral hemisphere are important in helping to control the initiation and termination of skeletal muscle movements?
Which of the labeled structures in the diagram is the thalamus?


Which of the following types of tracts are used to conduct nerve impulses between gyri within the same cerebral hemisphere?
An electroencephalogram (EEG)measures brain waves primarily generated by
Damage to which of the cranial nerves in the diagram would result in strabismus?


Which of the following glands is directly controlled by hormones produced by the hypothalamus?
Which of the following are networks of capillaries that produce cerebrospinal fluid and are found in the walls of the ventricles of the brain?
Which of the labeled structures in the diagram contains centers that control heart rate and blood pressure?


Which of the following is a fluid-filled cavity located in each hemisphere of the cerebrum?
Which region of the brain serves as the major relay station for most sensory impulses that reach the primary sensory areas of the cerebral cortex from the spinal cord and brain stem?
Which of the following is a narrow fluid-filled cavity found along the midline superior to the hypothalamus and between the right and left halves of the thalamus?
Which of the following functional areas of the cerebrum is responsible for vision?
A deep indentation found along the medial plane that separates the right and left cerebral hemispheres is called the
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