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 Dorsal median sulcus Dorsal horn Lateral horn
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

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
preganglionic myelinated 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. #68 Nerve 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. #71-2A Motor end plate
Terminal bouton

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