ntroduction - related Area of skin innervated by dorsal...

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ntroduction Cells in the nervous system Neurones (nerve cells): afferents; efferents; interneurones that make up the CNS Glia (glial cells): Schwann cells; microglial cells; astrocytes; oligodendroglial cells; ependymal cells Common features of neurones (unipolar, bipolar or multipolar) o Dendrites: receptive field of the neurones, sensitive to neurotransmitter input o o o Synaptic terminals: release transmitters & communicate with other cells in a pathway/circuit The Central Nervous System Brain o Cerebrum: Cerebral hemispheres, Basal ganglia, Cerebellum, Thalamus, Hypothalamic region o Brainstem: Midbrain, Pons, Medulla Spinal Cord Dermatomes Segmental organisation of spinal cord & nerves & sensory innervation of skin are
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Unformatted text preview: related Area of skin innervated by dorsal roots of 1 spinal segmant is called a dermatome 1:1 relationship between dermatomes & spinal segments (forms stripes when mapped on body) Dermatomal map used clinically to determine & identify spinal segment damage (sensory loss) Functional organisation of nervous system Function is mapped in the brain Somatosensory homunculus Motor homunculus Brodmann areas Efferent subdivision of Peripheral Nervous System Somatic nervous system o Axon fibres carried by 31 pairs of spinal nerves, each arising from a single segment o Also 12 pairs of cranial nerves which enter the brain Autonomic nervous system o Axon fibres carried by thoracic, lumbar & sacral nerves o Also 4 pairs of cranial nerves...
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ntroduction - related Area of skin innervated by dorsal...

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