Spinal nerves Flashcards
How does the spinal nerves arise from the spinal cord?
in pairs
one left one right
one pair for each spinal cord segment
How are the nerve formed?
union of the ventral and dorsal spinal nerve roots
as they travel through the vertebral foramina
What part of the nervous system does the spinal nerves belong?
peripheral nervous system
where does the ventral root arise?
ventral lateral sulcus
What do the ventral root transmit?
peripheral process of the lower motor neuron
From Where does the dorsal root emerge?
lateral sulcus of the spinal cord
What is located along each dorsal root?
dorsal root ganglion
What does the dorsal root ganglion contain?
neuronal cell bodies of sensory neurons
What does the dorsal root transmit?
peripheral processes of the sensory neuron to the spinal nerve and the central processes of the sensory neuron into the dorsal horn of the spinal cord
What are rami?
main branches of spinal nerve
they contain both motor and sensory fibers
What does the first division of spinal nerve create?
dorsal and ventral rami
How many pair of spinal nerves are there?
31 pair of spinal nerve
each pair arise from a spinal cord segment
How many cervical spinal nerves are there?
8 each exits above the arch of the vertebrae of same number except C-8 which enters above T1 and below C7
How many thoracic spinal segment are there?
12
each spinal nerve exits the vertebral foramina below of the same number
How many lumbar spinal segments are there?
5
each spinal nerve exit the foramina the segment below of the same number
