Situation #1 A neurosurgeon is about to perform brain surgery. The surgeon touches (stimulates with an electrode)...

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Medical Sciences

Situation #1

A neurosurgeon is about to perform brain surgery. The surgeontouches (stimulates with an electrode) a tiny portion of thepatient’s brain, and the patient’s right finger moves. After notingthe reaction, the surgeon stimulates a portion of the brain a shortdistance away and the patient’s right thumb moves.

Questions to Answer

  1. What section of the brain has been stimulated? ____________What lobe is this in? ______________
  2. What hemisphere of the brain is being stimulated?________________
  3. During this stimulation, would the patient experience feelingsof pain? Why or why not?

Situation #2

A woman has suffered some type of damage to the brain. She isbeing tested to see where the damage might be. She is first shown apicture of herself and she is unable to recognize this picture.When she is shown a picture of her family, she is unable torecognize family members. What part of the brain might beinvolved?

Situation #3

In the case of “The Lost Mariner”, Oliver Sacks writes about a49 year-old man who suffered an accident at the age of 19. Hisscores on intelligence tests are unchanged over time, however, hehas trouble learning new information. What would your diagnosis be?What part of the brain do you think is affected?

Situation #4

Jim falls frequently and shows poor balance and an unusual gait.He shows jerky and uncoordinated movement. These difficulties maybe related to what part of the brain?

Situation #5

A 55 year old woman has suffered a minor stroke. Her majordifficulty is that she has no interest in eating or drinking. Whatarea of the brain may have been affected?

Situation #6

After a car accident, a young woman reports that she seems tohave a hole in her field of vision. She can’t see objects in aparticular location. Her eyes seem to be fine. What might be theproblem?

Situation #7

You are watching a suspenseful video late at night and you heara sudden crash in another room. You leap out of your chair in fear,then realize that your dog kicked over his water bowl. Yourfear/stress reaction involved activation of the______________nervous system. Calming down involved activation ofthe ______________nervous system.

Situation #8

After an accident, patient T. has trouble planning and makingdecisions about how to go about performing his job. He also hastrouble paying attention in meetings. Before the accident he was ahighly reliable employee. After the accident, he adopted anattitude that it did not matter whether he completed assignments orwas courteous to clients. What area of the brain may have beenaffected?

Situation #9

The setting: You are a famous neurosurgeon whospecializes in brain damage involving the language system. In eachof the following cases, make a diagnosis concerning where youbelieve brain damage has occurred.

Case 1: A 56-year-old female has suffered a recent stroke. Shespeaks in a curious manner resembling fluent English but thephrases make no sense. You also find that she comprehends yourverbal or written instructions and can even write them down, buthas difficulty repeating them.

Case2:  An intelligent businessman comes to you andexplains rather agitatedly that he awakened yesterday morning tofind, much to his dismay, that he could no longer read. Your testsdetermine the following: a) He is totally blind in the right visualfield. b) He speaks fluently and comprehends speech. c) He canwrite with his right hand but cannot read what he has written. d)He can copy written words but only with his left hand. You turn toyour puzzled assistant and remark that this is indeed a tough one,but you are willing to bet that you will find brain damage in atleast two areas, which are ________________ and_______________.

Answer & Explanation Solved by verified expert
3.7 Ratings (342 Votes)
Section 1 Primary motor cortex Brodmann area 4 is a brain region that in humans is located in the dorsal portion of the frontal lobe It is the primary region of the motor system and works in association with other motor areas including premotor cortex the supplementary motor area posterior parietal cortex and several subcortical brain regions to plan and execute movements Frontal lobe Left hemisphereright part of body controlled by left hemisphere Touch Thermoception and Noiception Yes it will be stimulated A number of receptors are distributed throughout the skin to respond to various touchrelated stimuli These receptors include Meissners corpuscles Pacinian corpuscles Merkels disks and Ruffini corpuscles Meissners corpuscles respond to pressure and lower frequency vibrations and Pacinian corpuscles detect transient pressure and higher frequency vibrations Merkels disks respond to light pressure while Ruffini corpuscles detect stretch The skin can convey many sensations such as the biting cold of a wind the comfortable pressure of a hand holding yours or the irritating itch from a woolen scarf The different types of information activate specific receptors that convert the stimulation of the skin to electrical nerve impulses a process called transduction There are three main groups of receptors in our skin mechanoreceptors responding to mechanical stimuli such as stroking stretching or vibration of the skin thermoreceptors responding to cold or hot temperatures and chemoreceptors responding to certain types of chemicals either applied externally or released within the skin such as histamine from an inflammation The experience of pain usually starts with activation of nociceptorsreceptors that fire specifically to potentially tissuedamaging stimuli Most of the nociceptors are subtypes of either chemoreceptors or mechanoreceptors When tissue is damaged or inflamed certain chemical substances are released from the cells and these substances activate the chemosensitive nociceptors Mechanoreceptive nociceptors have a high threshold for activationthey    See Answer
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