Which statement is most descriptive of a concussion?
a. Petechial hemorrhages cause amnesia.
b. Visible bruising and tearing of cerebral tissue occur.
c. It is a transient, reversible neuronal dysfunction.
d. A slight lesion develops remote from the site of trauma.
ANS: C
A concussion is a transient, reversible neuronal dysfunction with instantaneous loss of awareness and responsiveness resulting from trauma to the head. Petechial hemorrhages along the superficial aspects of the brain along the point of impact are a type of contusion but are not necessarily associated with amnesia. A contusion is visible bruising and tearing of cerebral tissue. Contrecoup is a lesion that develops remote from the site of trauma as a result of an acceleration/deceleration injury.
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