Spinal Rami

Question 0

What does the Small Dorsal Ramus innervate?

Answer 0

The posterior trunk via several branches in a simple segmented pattern.

Question 1

Immediately upon exiting the intervertebral foramen, the short spinal nerves branch into how many distal rami?
What do the distal rami carry?
Where are they located?

Answer 1

• 3-4 distal rami.
• contain mixed fibers.
• spinal rami are lateral to the nerve.

Question 2

Where does the Larger Ventral Ramus innervate?

Answer 2

T1-T12 innervate the thorax as intercostal nerves.
- supplying muscles of the ribs, anterolateral thorax & abdominal wall.

All other ventral rami form complex networks to innervate limbs.

Question 3

What does the Tiny Meningeal Branch innervate?

Answer 3

Re-enters the vertebral canal to innervate the spinal cord meninges & blood vessels.

Question 4

What do the Rami Communicantes form?

Answer 4

Base of the ventral rami in the thoracic region.

Becoming the sympathetic trunk ganglia and carry out autonomic motor fibers.