unknown anatomy part 2 - innervation...

Question 1

Sympathetic supply

Answer 1

thoracolumbar outflow T1-L2, sympathetic chain also known as para vertebral chain or prevertebral ganglia

Question 2

Parasympathetic supply

Answer 2

Craniosacral outflow - some cranial nerves + S2, S3 and S4

Question 3

Sympathetic trunk

Answer 3

Like a string of beads in front of vertebrae with the beads being ganglia

Question 4

Where must a sympathetic nerve fibre go to get from the vertebrae to the sympathetic chain (T1-T4/5)

Answer 4

Start at lateral grey horn (in vertebra) to ventral ramus of spinal nerve
Through white ramus communicantes
To paravertebral ganglion
After synapsing, it leaves the ganglion (grey rami communicantes) and passes to pulmonary/cardiac/oesophageal plexi

Question 5

which levels do the greater, lesser and least splanchnic nerves arise from

Answer 5

Greater: T5-9
Lesser: T10-11
Least: T12

Question 6

How splanchnic nerves leave vertebra (T5-T12)

Answer 6

Same route as sympathetic trunk, but when they enter the ganglion, they don’t synapse
They synapse in the prevertebral (pre-aortic) ganglia and then pass to abdominal viscera