The cerebellum i

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human body, neurology, neuroscience, human brain, the parts of the brain, human anatomy, neurosurgery, about the human brain, a human brain, the human brain, structure of brain,cerebellum

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The cerebellum i

  1. 1. www.MedicalLecturenotes.com
  2. 2. •The position of the cerebellum 1)Situated in the posterior cranial fossa 2)Covered superiorly by the tentorium cerebelli 3)Lies posterior to the 4th ventricle, pons & medulla oblongata•Cerebellum has 2 hemispheres & they are joined by thevermis•It’s connected to the brainstem by the superior, middle & inferiorcerebellar peduncles•Cerebellum has 3 lobes : Anterior, Middle (Largest) &Flocculonodular lobe•Cerebellum has 2 covering outer of grey matter (Cortex) &inner white matter www.Medicallecturenotes.com
  3. 3. Cortex (The grey matter) Layers of the cerebellar cortex 1) External layer : Molecular layer (Contains 2 types of neurons) • Stellate cells (Outer) • Basket cells (Inner) 1) Middle layer : Purkinje layer (Purkinje cells are large Golgi type I neurons) 2) Internal layer : Granular layer (Packed with small cells) www.Medicallecturenotes.com
  4. 4. Cortex (The grey matter) Functional areas of the cerebellar cortex 1. Vermis : Influence the movements of the long axis of the body (Neck, shoulder, thorax, abdomen & hips) 2. Intermediate zone : Control the muscles of the distal parts of the limbs – Hands & feet 3. Lateral zone : Involved in planning sequential movements & conscious assessment of movement errors www.Medicallecturenotes.com
  5. 5. The white matterWhite matter is made up of 3 groups of fibers •Intrinsic fibers : Don’t leave the cerebellum, but connect different parts of the organ •Afferent fibers : Proceed to the cerebellar cortex •Efferent fibers : Constitute the output of the cerebellum4 masses of grey matter are embedded in the white matterforming intra cerebellar nuclei (Lateral to medial) •Dentate nucleus •Emboliform nucleus : Axons form the superior cerebellar peduncle •Globose nucleus •Fastigial nucleus : Axons form the inferior cerebellar peduncle www.Medicallecturenotes.com
  6. 6. The white matterThe cerebellum (Superior view) www.Medicallecturenotes.com
  7. 7. The white matterThe lobes of the cerebellum www.Medicallecturenotes.com
  8. 8. The white matterPositions of the intra cerebellar nuclei www.Medicallecturenotes.com
  9. 9. "It will take only 2 sec to say thanks and will take only 10 sec to write a comment it will be a nice encouragement for us "Dr. Pulasthi Senaratna www.medicallecturenotes.com

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