1 / 11

DIENCEPHALON II

DIENCEPHALON II. Dr. Ahmed Fathalla Ibrahim. SUBTHALAMUS. SUBTHALAMUS. SITE: below thalamus, dorsolateral to hypothalamus COMPONENTS: Subthalamic nucleus: connected to globus pallidus (by subthalamic fasciculus) & to substantia nigra

rockyr
Download Presentation

DIENCEPHALON II

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. DIENCEPHALON II Dr. Ahmed Fathalla Ibrahim

  2. SUBTHALAMUS

  3. SUBTHALAMUS SITE: below thalamus, dorsolateral to hypothalamus COMPONENTS: • Subthalamic nucleus: connected to globus pallidus (by subthalamic fasciculus) & to substantia nigra • Zona incerta (between thalamus & subthalamic nucleus): rostral extension of brain stem reticular formation • ROLE: control of voluntary movements

  4. HYPOTHALAMUS SITE: • Below thalamus, separated from it by hypothalamic sulcus • Lies in the interpeduncularfossa (tuber cinereum, infundibulum, mammillary bodies) RELATION TO THIRD VENTRICLE: forms: • The lower part of lateral wall • Floor FUNCTION: regulator

  5. HYPOTHALAMUS

  6. HYPOTHALAMIC NUCLEI LATERAL HYPOTHALAMIC: “feeding center”: lesion aphagia MEDIAL HYPOTHALMIC: • Supraoptic: produces vasopressin • Paraventricular: produces oxytocin • Suprachiasmatic: controls diurnal rhythm • Anterior: stimulates parasympathetic system

  7. HYPOTHALAMIC NUCLEI TUBERAL: • Ventromedial:“satiety centre”: lesionhyperphagia • Arcuate:produces releasing & release-inhibiting factors MAMMILARY REGION: • Mammillary: a part of limbic system • Posterior: stimulates sympathetic system

  8. MEDIAN SAGITTAL SECTION

  9. THE THIRD VENTRICLE

  10. THE THIRD VENTRICLE CAVITY: of diencephalon COMMUNICATIONS: • With lateral ventricle:through interventricular foramen of Monro • With fourth ventricle:through cerebral acqueduct of Silvius

  11. THE THIRD VENTRICLE BOUNDARIES: • ROOF: layer of ependyma covered by pia • FLOOR: hypothalmus • LATERAL WALL: • Upper part: thalamus • Lower part: hypothalamus • ANTRERIOR WALL: anterior commissure, lamina terminalis • POSTERIOR WALL: posterior commissure, pineal body

More Related