KROK 1 Stomatology 2013 – Question 26 · KROK (Dentistry)
In the experiment, an animal had its brain stem cut, which caused a rapid increase of extensor muscle tone (decerebrate rigidity). This condition arose because the muscles were no more under the control of the following brain structure:
- A. Blue spot
- B. Gray tuber
- C. Black substance
- D. Red nucleus
- E. Striatum
Hint
Think about which midbrain structure normally inhibits the excitatory vestibulospinal influence on extensor motor neurons, and where the cut must pass to release that influence.
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