Lecture+03_Anat_virtual

Lecture+03_Anat_virtual - Neuroanatomy (continued) Quick...

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Neuroanatomy (continued)
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Quick Review 1. What were 2 main divisions of Nervous System, and what structures did they consist of? 2. What were subdivisions of PNS? 3. What were subdivisions of ANS? 4. What are 2 main cells types in nervous system? 5. What are 3 ways neurons can be classified? 6. What are the 3 protective layers between skull & brain called?
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Brain Neuroanatomy: Outline I. Anatomical terms II. Meninges III. Development IV. Ventricular system V. Divisions VI. Nerves
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III. Development of CNS 1. Neurogenesis : proliferation of neurons in neural tube & migration of cells to predetermined locations 2. Axons & dendrites grow: arborization (dendritic branching) 3. Synaptogenesis 4. Myelination 5. Pruning 6. Regional, lobular & convolutional development
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IV. The Ventricular System
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CEREBRUM THALAMUS MIDBRAIN PONS MEDULLA SPINAL CORD The divisions of the brain are seen here in a Frontal (Coronal) Slice of a postmortem brain.
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LV (left) Upper horn LV(left) Lower horn LV (left) Upper horn 4th V 3rd V 3rd V Right LV Left LV 4th V LV (right) Lower horn
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Appreciating the lateral ventricles in an angled resection
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Cerebrospinal Fluid (CSF) Contained w/i 4 brain ventricles (CSF build up results in hydrocephalus ) Produced by the choroid plexus Functions: net weight of brain (~ 1.4Kg to < 80g); cushions brain against mechanical shock; provides reservoir of hormones & nutrition for brain & spinal cord LV LV 3V
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Lumbar Puncture : sampling CSF for diagnostic purposes The area is made numb by local anesthetic, and a small needle is passed between the bones (vertebrae) of the spine, and posterior to the end of the spinal cord. There is no risk of paralysis.
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V. Divisions of the Brain Major division ventricles subdivision Cerebral cortex, hippocampus, basal ganglia, amygdala Hypothalamus, thalamus inferior colliculi, substantia nigra Note : complete forebrain = prosencephalon ; complete hindbrain = rhombencephalon pons, cerebellum medulla Areas of major interest
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V. Structure of the Brain Divisions: Hindbrain The Hindbrain consists of the: Medulla. Pons.
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Lecture+03_Anat_virtual - Neuroanatomy (continued) Quick...

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