THRC.9 Flashcards
Neurons of the sympathetic system
Preganglionic neurons
After entering the sympathetic trunk, give the fate of the preganglionic neurons
- Synapse with the local ganglion
- Run cranially/caudally to a vertebral ganglion
- Splanchnic nerves
Give the divisions of truncus sympaticus
- Cephalic part
- Cervical part
- Thoracic part
- Abdominal part
- Sacral part
- Coccygeal part
Which system is the sympathetic system part of?
Autonomic nervous system
In the spinal cord: Sympathetic neurons communicate with peripheral sympathetic neurons via…
Sympathetic ganglia
Give examples of sympathetic effects
- Pupil dilation
- Increased heart rate
- Increased blood pressure
Preganglionic neurons span which region of the spinal cord?
Th1 - L3
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Cranial cervical ganglion
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Cervical part of the sympathetic trunk
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Stellate/cervicothoracic ganglion
- Medial to R1
- Marks the end of the cervical sympathetic trunk
- Fusion of caudal cervical and cranial thoracic ganglia
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Middle cervical ganglion
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Cervical cardiac nerve
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Sympathetic trunk
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Vertebral nerve
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Greater splanchnic nerve
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- Solar plexus
- Celiac ganglion
- Cranial mesenteric ganglion
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Lesser splanchnic nerve
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Lumbar splanchnic nerves
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Caudal mesenteric ganglion
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Sacral splanchnic nerves
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Hypogastric nerve
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Pelvic ganglia
What is shown?
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Sacral + coccygeal part of sympathetic trunk (Cat)
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Last lumbar vertebral ganglion
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Vertebral ganglion
on level with S1
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Right sympathetic trunk
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Coccygeal ganglion (fused)
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Sympathetic trunk
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Middle cervical ganglion
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Vertebral nerve
1
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Cranial cervical ganglion
2
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Stellate/cervicothoracic ganglion
3
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Ansa subclavia
- Between middle cervical and stellate ganglion
At what point does the sympathetic trunk separate from the vagus nerve?
At the atlas
- Terminating into the cranial cervical ganglion
Function of cranial cervical ganglion
Sympathetic innervation for the head
Path of the internal carotid nerve
Cranial cervical ganglion → Innervates blood vessels in the cranium
- Travels through the for. lacerum
Branches of the stellate ganglion
- Communicating branches
- Vertebral nerve
- Cervical cardiac nerves
- Perivascular branches
- Thoracic part of sympathetic trunk
The splanchnic nerves connect…
The prevertebral ganglia
Hypogastric nerves pass from the
Caudal mesenteric ganglion
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Cranial cervical ganglion