Final answer:
Tetanus is a condition caused by a severe injury to the midbrain, resulting in muscle stiffness, spasms, and rigidity. Lockjaw is a common symptom of tetanus. Vaccination is important for prevention, and treatment involves antitoxin and supportive care.
Step-by-step explanation:
The symptoms described in the question, such as teeth clenching, extended arms and legs, and flexed wrist, are consistent with a condition called tetanus. Tetanus is caused by a severe injury to the midbrain, which leads to the release of a neurotoxin called tetanospasmin. This toxin affects the motor neurons and causes muscle stiffness, spasms, and rigidity.
Lockjaw, or the inability to open the mouth, is a characteristic symptom of tetanus. This condition can become generalized and affect other muscles in the body, leading to severe complications.
Tetanus is usually prevented through vaccination, and treatment involves administration of antitoxin and supportive care.