Question

From which vertebral levels does the sympathetic innervation to the testis originate?

A) T8 and T9
B) T10 and T11
C) T12 and L1
D) L2 and L3

Answer 1

The sympathetic innervation to the testis originates from the T10 and T11 levels of the spinal cord, part of the preganglionic sympathetic fibers of the thoracolumbar system.

Step-by-step explanation:

The sympathetic innervation to the testis originates from the spinal cord levels of T10 and T11. The sympathetic division of the autonomic nervous system is also known as the thoracolumbar system, which reflects the origins from the thoracic and upper lumbar spinal cord. The sympathetic fibers that innervate the testes arise as preganglionic sympathetic fibers emanating from the spinal cord segments T10 and T11. These fibers then travel through the sympathetic chains and ultimately reach the testes.