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Development of metencephalon

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Development of metencephalon

  1. 1. DEVELOPMENT OF METENCEPHALON
  2. 2. MOTOR AND SENSORY NUCLEI Som. efferent: CN VI SVE: motor nuclei of CN V and CN VII GVE: Sublingual and submandibular gland ………………………… SA: CN VIII,CN V SVA: GVA:
  3. 3. CEREBEELUM
  4. 4. RHOMBIC LIPS Dorsolateral part of alar plate bends medially to form rhombic lips POSITION: Caudally: widely seperated Just below the mesencephalon: approach each other in the midline
  5. 5. CEREBELLAR PLATE With further deepening of pontine flexure, rhombic lips are compressed craniocaudally to form cerebellar plate
  6. 6.  VERMIS: a midline tubercle appear on c.plate CEREBELLAR HEMISPHERES: one on each side of vermis TRANSVERSE FISSURE: seperates nodule from vermis and flocculus from cerebellar hemispheres
  7. 7. LAYERS OFCEREBELLUM Initially: Neuroepithelial layer, Mantle layer, Marginal layer EXTERNAL GRANULAR LAYER OF CEREBELLUM:A number of cells produced from neuroepi layermigrate towards the surface and form this layer.+ Cells of this layer retain their ability to divide andform a proliferative zone in cerebellum
  8. 8.  GRANULE CELLS: cells of ext.granular layer form a variety of cells which migrate towards differentiating purkinje cells to form granule cells. BASKET AND STELLATE CELLS: formed in white matter of sp.cord
  9. 9. CELLS OF CEREBELLAR CORTEX(REACHTHEIR DEFINITIVE SIZE AFTER BIRTH) Purkinje cells Golgi II cells External granular cells
  10. 10. DEEP NUCLEI(REACH THEIR FINAL DEFINITIVEPOSITION BEFORE BIRTH) Dentate nucleus

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