Diencephalon

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  • very informative...just as given in snell neuro anatomy...jazak ALLAH
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Diencephalon

  1. 1. DIENCEPHALON DEVELOPMENT
  2. 2. ANATOMY OF DIENCEPHALON• CONSISTS OF THE THIRD VENTRICLE AND THE STRUCTURES THAT FORM ITS BOUNDARIES• EXTENT• INTERVENTRICULAR FORAMEN--- ANTERIORLY TO• THE POINT WHERE THE 3rd VENTRICLE BECOMES CONTINUOUS WITH THE AQUEDUCT---POSTERIORLY
  3. 3. ANATOMY OF DIENCEPHLON• INFERIOR SURFACE• ONLY EXPOSED AREA• INCLUDES FROM ANTERIOR TO POSTERIOR----• OPTIC CHIASMA &OPTIC TRACT• INFUNDIBULUM WITH TUBER CINEREUM• MAMMILARY BODIES
  4. 4. ANATOMY OF DIENCEPHALON• SUPRIOR SURFACE• FORMED BY THE ROOF OF 3rd VENTRICLE• CONCEALED BY FORNIX---A THICK BAND OF FIBRES----ARISES IN THE HIPPOCAMPUS--- ARCHES OVER THE THALAMUS TO JOIN THE MAMMILARY BODIES
  5. 5. ANATOMY OF DIENCEPHALON• MEDIAL SURFACE• FORMED BY—• THALAMUS AND• HYPOTHALAMUS• LATERAL SURFACE• BOUNDED BY• INTERNAL CAPSULE
  6. 6. DEVELOPMENT OF DIENCEPHALON• DEVELOPS FROM FOREBRAIN VESICLE• ROOF AND FLOOR PLATES REMAIN THIN• LATERAL WALLS BECOME THICK• WITH THE CLOSURE OF THE ROSTRAL NEUROPORE A DIVERTICULUM------THE OPTIC VESICLE APPEARS ON EACH SIDE OF THE FOREBRAIN• PART OF BRAIN CAUDAL TO OPTIC VESICLE FORMS THE DIENCEPHALON
  7. 7. DEVELOPMENT OF DIENCEPHALON• RETINA AND OPTIC DISK DERIVED FROM OPTIC VESICLE AND STALK• CAVITY OF DIENCEPHALON FORMS THE GREATER PART OF 3rd VENTRICLE• SMALL PART OF THE CAVITY OF THE TELENCEPHALON ALSO CONTRIBUTES TO THE FORMATION OF 3rd VENTRICLE
  8. 8. DEVELOPMENT OF DIENCEPHALIN• DIENCEPHALON CONSISTS OF---• A ROOF PLATE AND• TWO ALAR PLATES• ROOF SHOWS A SMALL DIVERTICULUM IMMEDIATELY ANTERIOR TO MIDBRAIN WHICH WILL FORM THE PINEAL BODY• REMAINDER OF THE ROOF WILL FORM THE CHOROID PLEXUS OF 3rd VENTRICLE
  9. 9. DEVELOPMENT OF DIENCEPHALON• THREE SWELLINGS DEVELOP IN THE LATERAL WALL OF 3rd VENTRICLE WHICH LATER BECOME THE---• 1 EPITHALAMUS• 2 THALAMUS• 3 HYPOTHALAMUS
  10. 10. DEVELOPMENT OF DIENCEPHALON• THALAMUS SEPARATED FROM EPITHALAMUS BY EPITHALAMIC SULCUS• THALAMUS SEPARATED FROM HYPOTHALAMUS BY HYPOTHALAMIC SULCUS• PINEAL BODY• INITIALLY APPEARS AS AN EPITHELIAL THICKENING IN MIDLINE• BY 7th WEEK BEGINS TO EVAGINATE• BECOMES A SOLID ORGAN ON THE ROOF OF MESENCEPHALON
  11. 11. DEVELOPMENT OF DIENCEPHALON• THALAMUS• ARISES AS A THICKENING OF ALAR PLATE ON THE LATERAL WALLS OF 3rd VENTRICLE• DEVELOPS RAPIDLY ON EACH SIDE• BULGES INTO THE CAVITY OF 3rd VENTRICLE REDUCING IT TO A NARROW CLEFT• IN 70 % OF BRAINS THE THALAMI MEET AND FUSE IN THE MIDLINE FORMING A BRIDGE OF GRAY MATER ACROSS THE 3rd VENTRICLE---THE INTERTHALAMIC ADHESION OR MASSA INTERMEDIA
  12. 12. DEVELOPMENT OF DIENCEPHALON• MEDIAL GENICULATE BODY AND• LATERAL GENICULATE BODY• DEVELOP AS SOLID BUDS---- THE METATHALAMUS
  13. 13. DEVELOPMENT OF DIENCEPHALON• HYPOTHALAMUS• ARISES BY PROLIFERATION OF NEUROBLASTS IN LOWER PART OF ALAR PLATE ON EACH SIDE OF 3rd VENTRICLE VENTRAL TO HYPOTHALAMIC SULCUS• A NUMBER OF NUCLEI CONCERNED WITH ENDOCRINE ACTIVITIES AND HOMEOSTASIS DEVELOP
  14. 14. DEVELOPMENT OF DIENCEPHALON• MAMILLARY BODIES• A PAIR OF NUCLEI• FORM PEA-SIZED SWELLINGS ON THE VENTRAL SURFACE OF HYPOTHALAMUS
  15. 15. DEVELOPMENT OF DIENCEPHALON• THIRD VENTRICLE• DEVELOPS FROM THE---• 1 CAVITY OF DIENCEPHALON AND• 2 SMALL PART OF THE CAVITY OF TELENCEPHALON
  16. 16. DEVELOPMENT OF DIENCEPHALON• THIRD VENTRICLE [ CONTD ]• ROOF PLATE OF DIENCEPHALON IS THIN MADE UP OF A SINGLE LAYER OF EPENDYMA COVERED BY VASCULAR MESENCHYME FORMING THE CHOROID PLEXUS• ROOF EXTENDS FROM THE INTERVENTRICULAR FORAMEN TO HABENULAR COMMISSURE
  17. 17. DEVELOPMENT OF DIENCEPHALON• THIRD VENTRICLE [ CONTD ]• ANTERIOR WALL• FORMED BY THE LAMINA TERMINALIS• LATERAL WALL• FORMED BY THE THALAMI• FLOOR• EXTENDS FROM OPTIC RECESS ON THE SUPERIOR SURFACE OF OPTIC CHIASMA INTO THE INFUNDIBULAR RECESS AND THEN ABOVE MAMILLARY BODY TO THE AQUEDUCT
  18. 18. THANK YOU

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