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Old 10-17-2012
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Neuro Effect of Hypoxia on Brain Functioning

A 25 year old medical student is buried by an avalanche of snow while skiing. Upon rescue, it is necessary to revive him from cardiopulmonary arrest. Although resuscitated, he remains in a coma for several hours before regaining consciousness. It is known that the patient has suffered global hypoxia. The function most likely to have been lost under this condition is the ability to

A. move facial muscles
B. Walk
C. move arms
D. move eyes
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Old 10-17-2012
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Move eyes?
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Old 10-17-2012
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Default c. move arms

Man in a barrel syndrome!
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Old 10-17-2012
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Correct Answer

C

The first of the motor functions to become deficient during hypoxic injury to the brain is the ability to move the arms. This is because the most distal ends of the anterior and middle cerebral arteries anastamose in the cerebral hemispheres over the location on the motor gyrus controlling the arms. The neurons in this anastomosing zone are very sensitive to hypoxic injury.
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Nervous-System-, Neuroanatomy-, Physiology-, Step-1-Questions

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