Share BIO121 Chapter 14 Spinal Cord
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What are sensory tracts in the spinal cord also known as?
ascending
What types of information do descending tracts in the spinal cord carry?
motor, output
How many sensory neurons are involved in sensation?
3
What are motor neurons from the CNS to the effector called?
lower motor neurons
How many cervical nerves are there?
8
How many sacral nerves are there?
5
What are bundles of nerves from a region of the spinal cord called?
nerve plexus
What is the longest and thickest nerve in the body?
sciatic
What plexus do the femoral and obturator nerve emerge from?
lumbar
Approximately how long is the spinal cord?
16-18 inches
What is the bottom of the spinal cord called?
conus medullaris
What are the nerves that exit the base of the spinal cord known as?
filum terminale
What are clusters of cell bodies in the PNS known as?
ganglia
Sensory information enters the CNS through the ________ root.
dorsal, posterior
Efferent information leaves the spinal cord through the _________ side.
ventral, anterior
A ________ initiates sensory information.
stimulus
