Damage to Wernicke's area of the brain may cause which of the following problems?
Difficulty speaking with proper grammar.
Inability to form words.
Inability to understand what others are saying.
Paralysis of the muscles used for speech.
The Correct Answer is C
Choice A rationale
Difficulty speaking with proper grammar while maintaining some ability to communicate is more characteristic of Broca's aphasia, which involves the motor speech area. Patients with Broca's damage can understand language but struggle to produce the mechanical sounds and complex grammatical structures. Wernicke's area, conversely, is located in the temporal lobe and focuses on the linguistic processing and comprehension of language rather than the motor output or grammatical construction of spoken sentences.
Choice B rationale
The inability to form words is known as expressive aphasia and is caused by damage to Broca's area in the frontal lobe. This area coordinates the muscles of the mouth and larynx to produce speech. A person with an injury here knows what they want to say but cannot physically execute the words. Wernicke's area damage results in a different problem where words can be formed easily, but they lack any coherent meaning or relevance to the conversation.
Choice C rationale
Wernicke's area is the primary region for language comprehension. Damage here results in receptive aphasia, where the patient can hear words but cannot grasp their meaning, much like hearing a foreign language. They may speak fluently and with normal rhythm, but the sentences are often nonsensical or contain "word salad.”. This occurs because the brain's ability to decode the symbolic meaning of auditory or written language has been fundamentally compromised by the injury.
Choice D rationale
Paralysis of the muscles used for speech is a motor deficit often caused by damage to the motor cortex or the cranial nerves, such as the hypoglossal or facial nerves. This is a physical inability to move the tongue or lips rather than a cognitive language disorder. Wernicke's area is a purely associative and cognitive region; it does not control the actual muscles. Therefore, a patient with Wernicke's aphasia usually has no physical paralysis of the speech apparatus.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A rationale
The motor pathways in the brain, specifically the corticospinal tract, undergo decussation or crossing over at the level of the medulla oblongata. This means that the motor neurons originating in the left hemisphere of the brain control the muscle movements on the right side of the body. When a stroke occurs in the left hemisphere, the resulting damage to these neurons manifests as contralateral weakness or paralysis on the right side.
Choice B rationale
Due to the contralateral organization of the central nervous system, injury to the left side of the brain does not typically result in isolated weakness on the same side. Ipsilateral weakness would only occur if the damage was below the point of decussation in the spinal cord. In the context of a hemispheric stroke, the physical deficits appear on the opposite side of the brain lesion. Therefore, left sided weakness would indicate a right hemisphere stroke.
Choice C rationale
A stroke involving the left hemisphere typically impacts the primary motor cortex or the internal capsule, which are essential for voluntary movement. It is medically expected that such an event will produce some level of neurological deficit unless the stroke was extremely small or located in a non functional area. Weakness or paralysis is a classic symptom of middle cerebral artery strokes. Suggesting that no side is affected ignores the basic principles of clinical neurology.
Choice D rationale
Weakness on both sides of the body, or quadriparesis, usually indicates a lesion in the brainstem or a very large bilateral injury, rather than a stroke confined to the left hemisphere. The brainstem contains the motor pathways for both sides before they fully separate or decussate. A focal stroke in one hemisphere is characterized by hemiparesis or hemiplegia, affecting only one half of the body. Bilateral weakness is not a standard expectation for a unilateral hemispheric stroke.
Correct Answer is C
Explanation
Choice A rationale
Infection of the endocardium describes endocarditis, which is an inflammatory process usually involving the heart valves and the inner lining of the heart chambers. This condition is typically caused by bacteria entering the bloodstream and colonizing damaged heart tissue. While serious, it is a different pathological process from a myocardial infarction, which is primarily a vascular event involving the coronary arteries rather than a primary infectious process of the heart lining.
Choice B rationale
A temporary deficit of oxygen that resolves with rest is the physiological definition of angina pectoris, specifically stable angina. In this state, the heart muscle experiences ischemia, which causes pain, but the cells do not suffer permanent damage or death because blood flow is restored quickly. Myocardial infarction is distinguished from this by the fact that the deprivation of oxygen is prolonged enough to cause irreversible tissue death and cellular necrosis.
Choice C rationale
Myocardial infarction occurs when a coronary artery is completely or nearly completely obstructed, often by a ruptured plaque followed by thrombus formation. This total blockage halts the delivery of oxygen and nutrients to the downstream cardiac tissue. Without blood flow, the myocytes undergo anaerobic metabolism, eventually leading to cell death and the loss of contractile function. This permanent structural damage is the defining characteristic of an infarction versus transient ischemia.
Choice D rationale
An increase in oxygen consumption by myocardial cells can trigger ischemia if the supply cannot keep up, but it does not describe the primary mechanism of an infarction. While high heart rates or hypertension increase demand, an infarction is defined by the failure of the supply line, usually due to a physical blockage. Increased demand is more often the precipitating factor for stable angina in a patient who already has narrowed, but not blocked, arteries.
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