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The hypothalamus I

Hypothalamic nuclei

Medial zone nuclei
Lateral zone nuclei
   1. Pre optic
   2. Anterior
   3. Supra chiasmatic
   4. Para ventricular
   5. Dorso – medial
   6. Ventero – medial
   7. Arcuate (Infundibular)
   8. Posterior
   1. Pre optic
   2. Supra chiasmatic
   3. Supra optic
   4. Lateral
   5. Tuberomammilary
   6. Lateral tuberal


Position of the hypothalamic nuclei


image
Hypothalamus receives information via:

1) Nervous connections
2) Blood stream
3) CSF


A. Afferent pathways of the hypothalamus

image


Pathway
Origin
Destination
  • Visual fibers
Retina
Supra chiasmatic nucleus
  • Medial & spinal lemnisci, tractus solitarius & RF
Viscera & somatic structures




Hypothalamic nuclei
  • Medial forebrain fibers
Olfactory mucus membrane
  • Auditory fibers
Inner ear
  • Cortico – hypothalamic fibers
Frontal lobe of the cerebral cortex
  • Amygdalo – hypothalamic fibers
Amygdaloid nucleus
  • Thalamo – hypothalamic fibers
Thalamus
  • Tegmental fibers
Tegmentum of the midbrain
  • Hippocampo – thalamic fibers (Limbic system)
Hippocampus
Nuclei of mammillary body



B. Efferent pathways of the hypothalamus


image


Pathway
Origin
Destination
  • Descending fibers in RF to brainstem & spinal cord
Pre optic, anterior, posterior & lateral nuclei of hypothalamus
Cranio – sacral parasympathetic & thoraco – lumbar sympathetic outflows
  • Mammillo – thalamic tract

Nuclei of mammillary body
Anterior nucleus of thalamus, relayed to Cingulate gyrus 
  • Mammillo – Tegmental tract
RF in Tegmentum in midbrain
  • Multiple pathways
Hypothalamic nuclei
Limbic system
The hypothalamus I The hypothalamus I Reviewed by Radiology Madeeasy on August 05, 2010 Rating: 5
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