Neuroanatomy and circuits — structured clinical viva · Psych Vivas

Prompt

You are in a FRANZCP/MRCPsych-style viva. The examiner shows a schematic of the brain and asks you to teach the neural circuits a psychiatrist must know. Be prepared to cover prefrontal syndromes, Papez versus modern limbic anatomy, Alexander–DeLong loops, four dopamine pathways, Menon triple network, and a first-episode psychosis localisation work-up. Expect follow-ups on Howes–Kapur, Grace phasic/tonic DA, and why fMRI is not a diagnostic blood test.

Interpretation

Reveal interpretation

Open with a framework. “I organise psychiatric neuroanatomy into five layers: prefrontal zones, limbic/Papez-plus, basal-ganglia loops, midbrain dopamine paths, and large-scale networks.” Avoid monologue without clinical anchors.[1][4]

Prefrontal. DLPFC — cognitive control/working memory; OFC/VMPFC — valuation and social-affective regulation; ACC/medial — motivation/conflict. Bedside syndromes: dysexecutive, disinhibited, abulic.[6]

Limbic. Teach Papez as historical closed loop (hippocampus–fornix–mammillary–anterior thalamus–cingulate) then immediately add amygdala and OFC as modern essentials.[7]

Loops. Alexander–DeLong: five parallel cortex–striatum–pallidum/SNr–thalamus–cortex circuits; psychiatric teaching emphasises DLPFC, lateral OFC, and ACC loops plus motor/oculomotor for movement-disorder interface.[1][6]

Dopamine. Four paths with clinical pairs; Howes–Kapur version III final common pathway and aberrant salience; Grace phasic vs tonic regulation as deeper viva polish.[2][3]

Networks. Raichle DMN; Seeley salience; Menon SN as switch between DMN and CEN. Explicitly say group imaging ≠ individual diagnosis.[4][5]

Clinical close. First-episode: organic screen + risk + MSE; circuit hypothesis guides differential and liaison, not prescription doses from memory of diagrams.[2][6]

Key points

[2] [4] [6]

References

[1]Alexander GE, DeLong MR, Strick PL Parallel organization of functionally segregated circuits linking basal ganglia and cortex Annu Rev Neurosci, 1986.PMID 3085570
[2]Howes OD, Kapur S The dopamine hypothesis of schizophrenia: version III--the final common pathway Schizophr Bull, 2009.PMID 19325164
[3]Grace AA Phasic versus tonic dopamine release and the modulation of dopamine system responsivity: a hypothesis for the etiology of schizophrenia Neuroscience, 1991.PMID 1676137
[4]Menon V Large-scale brain networks and psychopathology: a unifying triple network model Trends Cogn Sci, 2011.PMID 21908230
[5]Raichle ME, MacLeod AM, Snyder AZ, Powers WJ, Gusnard DA, Shulman GL A default mode of brain function Proc Natl Acad Sci U S A, 2001.PMID 11209064
[6]Cummings JL Frontal-subcortical circuits and human behavior Arch Neurol, 1993.PMID 8352676
[7]Papez JW A proposed mechanism of emotion. 1937 J Neuropsychiatry Clin Neurosci, 1995.PMID 7711480

Interpretation

Reveal interpretation

Limbic. Teach Papez as historical closed loop (hippocampus–fornix–mammillary–anterior thalamus–cingulate) then immediately add amygdala and OFC as modern essentials.[7]

Dopamine. Four paths with clinical pairs; Howes–Kapur version III final common pathway and aberrant salience; Grace phasic vs tonic regulation as deeper viva polish.[2][3]

Networks. Raichle DMN; Seeley salience; Menon SN as switch between DMN and CEN. Explicitly say group imaging ≠ individual diagnosis.[4][5]

Clinical close. First-episode: organic screen + risk + MSE; circuit hypothesis guides differential and liaison, not prescription doses from memory of diagrams.[2][6]

Key points

[2]

[4]

[6]

References

[1]Alexander GE, DeLong MR, Strick PL Parallel organization of functionally segregated circuits linking basal ganglia and cortex Annu Rev Neurosci, 1986.PMID 3085570
[2]Howes OD, Kapur S The dopamine hypothesis of schizophrenia: version III--the final common pathway Schizophr Bull, 2009.PMID 19325164
[3]Grace AA Phasic versus tonic dopamine release and the modulation of dopamine system responsivity: a hypothesis for the etiology of schizophrenia Neuroscience, 1991.PMID 1676137
[4]Menon V Large-scale brain networks and psychopathology: a unifying triple network model Trends Cogn Sci, 2011.PMID 21908230
[5]Raichle ME, MacLeod AM, Snyder AZ, Powers WJ, Gusnard DA, Shulman GL A default mode of brain function Proc Natl Acad Sci U S A, 2001.PMID 11209064
[6]Cummings JL Frontal-subcortical circuits and human behavior Arch Neurol, 1993.PMID 8352676
[7]Papez JW A proposed mechanism of emotion. 1937 J Neuropsychiatry Clin Neurosci, 1995.PMID 7711480