A nurse is teaching a group of nursing students about the pathophysiology of obsessive-compulsive disorders (OCDs) Which brain circuit is thought to be involved in OCDs, and what are its main components responsible for regulating cognitive processes?
Limbic circuit consisting of the hippocampus, amygdala, and hypothalamus.
Central executive circuit comprising the prefrontal cortex and temporal lobes.
Cortico-striato-thalamo-cortical (CSTC) circuit including the orbitofrontal cortex, anterior cingulate cortex, striatum, and thalamus.
Ventral tegmental circuit involving the substantia nigra and ventral tegmental area.
The Correct Answer is C
Choice A rationale:
The limbic circuit consisting of the hippocampus, amygdala, and hypothalamus is not the main brain circuit involved in obsessive-compulsive disorders (OCDs) The limbic circuit is more closely associated with emotions and memory, rather than the cognitive processes that drive OCD symptoms.
Choice B rationale:
The central executive circuit comprising the prefrontal cortex and temporal lobes is responsible for higher-level cognitive functions like decision-making and working memory. However, this circuit is not primarily implicated in the pathophysiology of OCD.
Choice C rationale:
The correct choice. The cortico-striato-thalamo-cortical (CSTC) circuit plays a central role in the development of OCD. This circuit involves several key components: Orbitofrontal cortex: Responsible for assessing potential risks and rewards, and for decision-making. Anterior cingulate cortex: Involved in error detection, emotional processing, and regulating cognitive flexibility. Striatum: Responsible for habit formation and reward-based learning. Thalamus: Acts as a relay station for information between various brain regions. This circuit's malfunction can lead to repetitive behaviors and intrusive thoughts characteristic of OCD.
Choice D rationale:
The ventral tegmental circuit involving the substantia nigra and ventral tegmental area is primarily associated with the brain's reward system and the regulation of mood and motivation. It is not a key player in OCD's pathophysiology.
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Related Questions
Correct Answer is ["B","D"]
Explanation
Choice A rationale:
This choice does not indicate symptoms of Body Dysmorphic Disorder (BDD) Feeling sad about being overweight is not specific to BDD and could be related to body dissatisfaction or other emotional concerns.
Choice B rationale:
This choice indicates a symptom of BDD. Constantly comparing one's appearance to that of celebrities suggests a preoccupation with perceived flaws, which is a hallmark of BDD. Individuals with BDD often engage in such comparisons as a way to validate their negative self-image.
Choice C rationale:
While spending excessive time in front of the mirror can be a symptom of BDD, the statement alone does not definitively indicate the disorder. It's important to consider the reason behind the mirror checking behavior and the individual's emotional distress related to it.
Choice D rationale:
This choice indicates a symptom of BDD. Avoiding social situations due to the fear of being negatively evaluated or judged based on one's perceived flaws is a classic sign of BDD. Individuals with BDD often believe that others are fixated on their perceived defects.
Choice E rationale:
This choice does not indicate symptoms of BDD. Having a collection of items without attaching sentimental value is not specific to BDD. It's important to focus on behaviors and thoughts related to perceived physical flaws when assessing for BDD.
Correct Answer is A
Explanation
Choice A rationale:
Family history of OCD is a significant risk factor for developing the disorder. Genetic predisposition plays a role in the etiology of OCD, with a higher likelihood of the disorder occurring in individuals who have close relatives (e.g., parents or siblings) with the condition. While environmental factors and life experiences can contribute to OCD, they are not as directly linked as the genetic component.
Choice B rationale:
History of childhood trauma can contribute to the development of various mental health disorders, including anxiety and OCD. However, the strongest association with OCD is the genetic component. While childhood trauma can exacerbate symptoms in individuals who are genetically predisposed, it is not the most likely finding in the medical record of a client with OCD.
Choice C rationale:
Head injury can lead to neurological and psychological changes, potentially contributing to various psychiatric conditions. However, the primary cause of OCD is not head injury. It is important to consider the presence of other factors, especially the genetic predisposition, when attributing OCD to a particular cause.
Choice D rationale:
Brain tumor is an organic condition that can cause neurological and psychological symptoms. However, brain tumors are not a common or primary cause of OCD. The focus in the etiology of OCD is on neurotransmitter imbalances, genetic factors, and brain circuitry, rather than structural brain abnormalities like tumors.
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