Which of the following neurotransmitters is correctly matched with its synthesis site?

Appeared in: NORCET -4 , 2023

Explanation

The question asks to identify the correctly matched pair of a neurotransmitter and its primary site of synthesis in the brain.
Serotonin, also known as 5-hydroxytryptamine (5-HT), is a monoamine neurotransmitter.
Its synthesis primarily occurs in a group of nuclei located in the brainstem called the Raphe nuclei.
From the Raphe nuclei, serotonergic neurons project to various brain regions to regulate functions like mood, sleep, appetite, and pain.
Therefore, the pairing of Serotonin with the Raphe nucleus is correct.

Option A: Acetylcholine is not synthesized in the substantia nigra. The substantia nigra is a primary site for dopamine synthesis.
Option C: Norepinephrine is not synthesized in the Nucleus basalis of Meynert. This nucleus is a primary site for acetylcholine synthesis.
Option D: Dopamine is not synthesized in the Locus ceruleus. The Locus ceruleus is the primary site for norepinephrine synthesis.

Visual 1: Diagram - A sagittal view of the human brain highlighting the locations of the Raphe nuclei (brainstem), Substantia nigra (midbrain), Nucleus basalis of Meynert (basal forebrain), and Locus ceruleus (pons). This helps visualize the distinct anatomical locations for each neurotransmitter's production.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Neurotransmitter Synthesis Sites as background academic context rather than a clinical decision trigger.
Understanding neurotransmitter origins is fundamental to psychopharmacology. For example, Selective Serotonin Reuptake Inhibitors (SSRIs) act on the serotonergic system originating from the Raphe nuclei to treat depression and anxiety.
Degeneration of dopaminergic neurons in the substantia nigra is the pathological hallmark of Parkinson's disease, leading to motor symptoms that nurses must manage.
Loss of cholinergic neurons in the Nucleus basalis of Meynert is a key feature of Alzheimer's disease, contributing to memory loss.

How to Approach the Question

This is a factual recall question requiring knowledge of neuroanatomy and neurochemistry.
First, identify the task: match the neurotransmitter with its correct synthesis site.
Evaluate each option systematically.
Option A: Recall that the substantia nigra produces dopamine, not acetylcholine. This is incorrect.
Option B: Recall that the Raphe nuclei are the main source of serotonin. This is correct.
Option C: Recall that the Nucleus basalis of Meynert produces acetylcholine, not norepinephrine. This is incorrect.

Concept Tested & Keywords

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Practise the full NORCET -4 , 2023

Attempt every question from this paper in a timed mock, then review the full solution for each one.