Question

the sympathetic nervous system originates mainly from the ______spinal cord.
thoracic
cervical
lumbar
sacral
coccygeal
question 92
which nerve innervates (supplies) the flexors of the hip and extensors of the knee?
femoral
sciatic
tibial
common perineal

Explanation:

The sympathetic nervous system is part of the autonomic nervous system. It has its pre - ganglionic neurons originating mainly from the thoracic and lumbar regions of the spinal cord (often referred to as the thoracolumbar outflow). Among the given options, thoracic is the most relevant as it is a major origin site.

For the nerve innervation question, the femoral nerve innervates the flexors of the hip (iliopsoas, which is partially innervated by femoral nerve branches) and the extensors of the knee (quadriceps femoris). The sciatic nerve is more involved in the posterior thigh, leg, and foot muscles. The tibial nerve is a branch of the sciatic nerve and is mainly for the posterior compartment of the leg and plantar foot muscles. The common perineal nerve (common fibular nerve) is for the lateral and anterior compartments of the leg and dorsal foot muscles.

Answer:

For the first question: thoracic.
For the second question: Femoral.