Neuromuscular, Digestive and Respiratory Systems: Sympathetic trunk

Sympathetic trunk

SYMPATHETIC TRUNK

Composed of chain ganglia viz vertebral ganglia.
This extends from upper cervical to coccygeal vertebrae.
Sympathetic trunk is represented as a paired structure having a ganglion for each thoracic, lumbar, sacral & upper coccygeal nerve.
Segmental ganglia in the cervical region is fused into three large ganglia (cranial cervical, middle cervical & caudal vertical ganglia)
Stellate ganglion is the fusion of caudal cervical ganglia with upper two thoracic ganglia.
Fibres from trunk composed of pre ganglionic & post ganglionic system.
Sympathetic pre ganglionic fibers in thoracic cavity, neck , head, blood vessel and sweat glands synapse with vertebral ganglia.
Those supplying abdominal and pelvic organs do not synapse within the vertebral ganglia
But collateral ganglia are formed by the synapse formed by these pre ganglionic fibers with post ganglionic neurons.

Last modified: Wednesday, 14 September 2011, 9:08 AM

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VPB 121: Veterinary Physiology - II (2+1)

Sympathetic trunk

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