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Peripheral Nervous System (nervous Tissue)

Peripheral Nervous System (nervous Tissue). September 23, 2009. Spinal cord, DRG, Sympathetic and Parasympathetic Ganglia. Netter pl. 154. IX. parasympathetic. X (vagus). Dorsal horns: Interneurons Ventral horns: Motor neurons Lateral horns:

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Peripheral Nervous System (nervous Tissue)

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  1. Peripheral Nervous System(nervous Tissue) September 23, 2009

  2. Spinal cord, DRG, Sympathetic and Parasympathetic Ganglia Netter pl. 154 IX parasympathetic X (vagus) Dorsal horns: Interneurons Ventral horns: Motor neurons Lateral horns: Sympathetic neurons Parasympathetic (S2-4) neurons DRG:Sensory (pseudounipolar) neurons Autonomic ganglia: Post ganglionic neurons with unmyelinated axons. Sympathetic: paravertebral ganglia Parasympathetic: In organs Somatic motor sensory Sympathetic: pre- & post-ganglionic fibers Pelvi splanchnic (parasympathetic)

  3. #65 Spinal cord and DRG 65-1N, Trichrome 65-2, H&E 65-1, Trichrome Dorsal median sulcus Dorsal horn Lateral horn Ventral horn Ventral median fissure Dorsal root ganglion (DRG)

  4. Motor neurons, glial cells and neuropil Glial cells Neuropil

  5. Dorsal root ganglion 65-1 65-1N 65-2

  6. Autonomic Nervous System(only several points relevant to today’s histology lab) • Consists of sympathetic and parasympathetic divisions. • Is a two fiber system consisting of • preganglionicmyelinated fibers and postganglionic unmyelinated fibers. • preganlionic fibers make synaptic contacts with postganglionic neuron cell bodies in respective ganglia. • Sympathetic ganglia are arranged alongside the vertebral column , forming a chain (chain or collateral ganglia) • Parasympathetic ganglia are located near or within the target organ (peripheral or terminal ganglia). • Preganglionic neuron cell bodies are located: • In sympathetic division, in the spinal cord (T1 – L2 or 3). • In parasympathetic division, • In the nuclei of CN III, VII, IX, and X • In S2, S3 and S4 of the spinal cord

  7. Spinal cord, DRG, Sympathetic and Parasympathetic Ganglia Netter pl. 154 IX parasympathetic X (vagus) Dorsal horns: Interneurons Ventral horns: Motor neurons Lateral horns: Sympathetic neurons Parasympathetic (S2-4) neurons DRG:Sensory (pseudounipolar) neurons Autonomic ganglia: Post ganglionic neurons with unmyelinated axons. Sympathetic: paravertebral ganglia Parasympathetic: In organs Somatic motor sensory Sympathetic: pre- & post-ganglionic fibers Pelvi splanchnic (parasympathetic)

  8. #74 Sympathetic ganglion cells

  9. #75 Parasympatheic ganglion cells(in Seminal vesicle)

  10. #250 Parasympatheic ganglion cells in vaginal wall

  11. Sensory and Autonomic Ganglia (cells)(DRG Parasympathetic)

  12. Sensory and Autonomic Neurons(DRG) (Parasympatheitc)

  13. #29 Parasympathetic ganglia #155

  14. #68Nerve bundle in transverse section Epineurium Perineurium

  15. #67 Peripheral nerve

  16. #67 Longitudinal and Transverse Section of P. Nerve Schwann cell membrane Axon

  17. A Schwann cell myelinate one axon A Schwann cell wraps around several unmyelinated axons

  18. #71-2AMotor end plate Terminal bouton

  19. #71-1A Neuromuscular spindle (junction)stretch receptor Intrafusal fibers #71-1B

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