The nurse evaluates the Babinski reflex and strokes the sole of the patient's foot from the outer heel to the little toe. The patient was in an automobile accident and has a decreased level of consciousness. Which response indicates an abnormality in the cerebral cortex?

The foot remains in the same position prior to stroking the sole of the foot.

Great toe bends upward and smaller toes fan outward.

Great toe bends downward.

The opposite foot assumes the same position as the foot being stroked.

Answer and Explanation

The Correct Answer is B

Choice A reason: This is incorrect. The foot remaining in the same position prior to stroking the sole of the foot is a normal response in adults. It indicates that the spinal cord and the brain are intact and functioning properly.

Choice B reason: This is correct. Great toe bending upward, and smaller toes fanning outward is an abnormal response in adults. It indicates a positive Babinski reflex, which is a sign of damage to the cerebral cortex or the pyramidal tract. The cerebral cortex is the outer layer of the brain that controls higher functions such as thinking, reasoning, and movement. The pyramidal tract is a bundle of nerve fibers that connects the cerebral cortex to the spinal cord and controls voluntary movements.

Choice C reason: This is incorrect. Great toe bending downward is also a normal response in adults. It indicates that the spinal cord and the brain are intact and functioning properly.

Choice D reason: This is incorrect. The opposite foot assuming the same position as the foot being stroked is not related to the Babinski reflex. It is a phenomenon called mirror movement, which may occur in some people due to genetic or developmental factors. It does not indicate any abnormality in the cerebral cortex.

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Correct Answer is B

Explanation

Choice A reason: Decreasing intracranial pressure with decerebrate posturing is not the correct answer. Decerebrate posturing is a sign of severe brain damage that involves the extension and outward rotation of the arms and legs, and the arching of the back. It is not associated with decreasing intracranial pressure, but rather with increased pressure or brainstem compression.

Choice B reason: Increasing intracranial pressure with decorticate posturing is the correct answer. Decorticate posturing is a sign of severe brain damage that involves the flexion of the arms at the elbows and the extension of the legs. It is associated with increased intracranial pressure or lesions in the cerebral hemispheres.

Choice C reason: Decreasing intracranial pressure with decorticate posturing is not the correct answer. Decorticate posturing is a sign of severe brain damage that involves the flexion of the arms at the elbows and the extension of the legs. It is not associated with decreasing intracranial pressure, but rather with increased pressure or lesions in the cerebral hemispheres.

Choice D reason: Increasing intracranial pressure with decerebrate posturing is not the correct answer. Decerebrate posturing is a sign of severe brain damage that involves the extension and outward rotation of the arms and legs, and the arching of the back. It is associated with increased intracranial pressure or brainstem compression, but it is not the posture described in the question.

A. macrocytic, normochromic B. microcytic, hypochromic C. normocytic, normochromic D. microcytic, normochromic

Correct Answer is A

Explanation

Choice A reason: This is correct. Folic acid deficiency causes macrocytic, normochromic anemia, which means that the red blood cells are larger than normal, but have normal color and hemoglobin content. Folic acid is a vitamin that is needed for the synthesis of DNA and the maturation of red blood cells.

Choice B reason: This is incorrect. Microcytic, hypochromic anemia means that the red blood cells are smaller than normal and have less color and hemoglobin content. This type of anemia is caused by iron deficiency, not folic acid deficiency.

Choice C reason: This is incorrect. Normocytic, normochromic anemia means that the red blood cells are normal in size, color, and hemoglobin content, but there are fewer of them. This type of anemia is caused by blood loss, hemolysis, or bone marrow failure, not folic acid deficiency.

Choice D reason: This is incorrect. Microcytic, normochromic anemia means that the red blood cells are smaller than normal, but have normal color and hemoglobin content. This type of anemia is rare and is caused by disorders of red blood cell production, such as thalassemia or sideroblastic anemia, not folic acid deficiency.

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The nurse evaluates the Babinski reflex and strokes the sole of the patient's foot from the outer heel to the little toe. The patient was in an automobile accident and has a decreased level of consciousness. Which response indicates an abnormality in the cerebral cortex?

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