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Session 10 - Life Sci 2C03 Session 10 Session 10...

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Life Sci 2C03 – Session 10 Session 10 – Neuroanatomy – Meninges, CDF and Hydrocephalus 1. Foramen Magnum – whole in base of skull 1. Medulla oblongata emerges from here (imp.) 2. Cerebellum on top of this 1. Sagital Suture 1. Fontala develops later in life 2. Suture line not fused as birth so that boney skull is slightly flexible Brain Stem 1. ‘vital centers’ for cardiovascular and respiratory functions 2. Major highway 3. Pressure on medulla oblongata = immediate death b/c major nerves present here 4. Brain Herniation 1. Through foramina magnum 2. Cause: increased intracranial pressure 3. Structures that herniate: brain stem, hippocampus, cerebellum 4. can lead to death due to pressure on “vital centre” **** Meninges 1. layers that surround the brain 2. 3 layers 1. Dura Mater – outermost dense layer; closely adherent to skull 2. Arachnoid Mater – middle layer 3. Pia Mater – innermost ; closely adherent to the brain Dura Mater 1. Thickets outermost layer; 2. Has dense innervations by pain-fibres via trigeminal nerve (V cranial nerve) 3. no pain fibres after Dura Mater 4. Dura forms two layers:
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Life Sci 2C03 – Session 10 1. Outer layer 1. strictly attached to bone 2. fracture in skull – outer layer tears 2. Inner layer 1. folds along sagittal and transverse planes to form scaffolds falx cerebri and
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