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
- 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 the vermis •It’s connected to the brainstem by the superior, middle & inferior cerebellar 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. 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. 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. The white matter White 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 cerebellum 4 masses of grey matter are embedded in the white matter forming 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. The white matter The cerebellum (Superior view) www.Medicallecturenotes.com
- 7. The white matter The lobes of the cerebellum www.Medicallecturenotes.com
- 8. The white matter Positions of the intra cerebellar nuclei www.Medicallecturenotes.com
- 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