A stereotaxic X-ray map of the hypothalamus of the marmoset monkey Callithrix jacchus

Summary Precise hypothalamic surgery in the marmoset monkey Callithrix jacchus cannot be performed by means of the Horsley-Clarke stereotaxic procedure. Thus, a simple stereotaxic X-ray technique was developed. Technical requirements are a stereotaxic frame for small animals and a dental X-ray source.A sagittal map shows hypothalamic structures in relation to surrounding bony landmarks. Corresponding coronal plates allow target determination in that plane. Intracerebral coordinates based on the position of the optic chiasma can be transformed into individual Horsley-Clarke coordinates. The error of the atlas is estimated as ± 0.25 mm anteroposteriorly, ± 0.1 mm coronally, and ± 0.5 mm vertically.List of Abbreviations AP-O Anteroposterior zero plane of Horsley-Clarke - BO Bulbus olfactorius - CA Commissura anterior - CC Corpus callosum - CM Corpora mamillaria - CO Chiasma opticum - CSM Commissura supramamillaris - FC Flocculus - FS Fissura lateralis (Sylvii) - FX Fornix - GA Decussatio supraopticus dorsalis (Ganser) - H₁ Field H₁ - H₂ Field H₂ - HH Horizontal plane of Horsley-Clarke - HHL Hypophysis, posterior lobe - HVL Hypophysis, anterior lobe - HY Hypophysis - INF Infundibulum - LMI Lamina medullaris interna - LPC Lobus posterior cerebelli - N II Foramen nervi optici - N III Fissura orbitalis superior (with Nervus oculomotorius) - PI Hypophysis, pars intermedia - PT Nuclei posteriores tuberis - PV Nucleus paraventricularis - SC Sulcus calcarinus - SO Nucleus supraopticus - ST Nucleus subthalamicus - STS Sulcus temporalis superior - TH Thalamus - THP Tractus habenulopeduncularis - TL Nucleus tuberis lateralis - TMT Tractus mamillothalamicus - TO Tractus opticus - VMH Nucleus ventromedialis hypothalami