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Nervous System, Ilyanna Sanchez, Period 1 - Coggle Diagram
Nervous System, Ilyanna Sanchez, Period 1
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Tissues
- Neuroglia (glial cells): small cells that surround and wrap delicate neurons
- Neurons (nerve cells): excitable cells that transmit electrical signals
- Astrocytes
▪ Most abundant, versatile, and highly branched of glial cells
▪ Cling to neurons, synaptic endings, and capillaries
- Microglial cells
▪ Small, ovoid cells with thorny processes that touch and monitor neurons
▪ Migrate toward injured neurons
▪ Transforms to phagocytize microorganisms and neuronal debris
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Spinal nerves
- 8 pairs of cervical nerves (C1–C8)
- 12 pairs of thoracic nerves (T1–T12)
- 5 pairs of lumbar nerves (L1–L5)
- 5 pairs of sacral nerves (S1–S5)
- 1 pair of tiny coccygeal nerves (C0)
- Ventral roots: motor fibers from ventral horn motor neurons that innervate skeletal muscles
- Dorsal roots: sensory fibers from sensory neurons in dorsal root ganglia that conduct impulses from peripheral receptors
- ventral and dorsal roots are branched medially as rootlets that then join laterally to
form spinal nerve
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