Want this question answered?
The spinal nerves that originate from the thoracic portion of the spinal cord don't form plexuses. The word thoracic pertains to the thorax.
Network of spinal nerves
the spinal nerves which comprise the brachial plexus are C5 - C8 and T1. lumosacral plexus are L1 - L5, S1 - S4 and SR.
Dorsal and ventral roots are a feature of spinal nerves only. Cranial nerves do not have dorsal and ventral roots.
The brachial plexus is the spinal cord feature associated with the leash of nerves supplying the upper limbs.
lumbosacral plexus
spinal nerve
It is where the nerves go and spinal fluid is and protects spinal cord
Lumbar plexus
Spinal nerves exiting the spinal canal between L4 and S4 collectively make up the sacral plexus.
Phrenic nerves from brachial and cervical plexus.
It provides innervation to the pelvis, its organs and the lower limb