nerve part 2 xtra Flashcards
first layer of protection for CNS (2)
hard bony skull and vertebral column is the first layer of protection for CNS
Second protective layer in CNS
meninges
surround the spinal cord
spinal meninges
surround the brain
cranial meninges
spinal cord also protected by a cushion of fat connective tissue located where?
epidural space
space between dura mater and the wall and of the vertebral canal
epidural space
the meninx layer consists of thin squamous to cuboidal cells
Pia Mater
meninx layer that has its spider’s web arrangement of delicate collagen fibers
Arachnoid Mater
Thick strong layer composed of dense irregular connective tissue
Dura Mater
to introduce antibiotics, for myelography, or anesthetics, to administer chemotherapy
spinal tap
tapered end of spinal cored
Conus medullaris
collective horsetail
Cauda equina
Bellow L2 is where the _______ nervous system starts
Bellow L2 is where the Peripheral nervous system starts
Adults have _____ Total Bones in the vertebral column
Adults have 26 Total Bones in the vertebral column
This is Inferior to the lumbar enlargement. the spinal cord terminates as a tapering, conical structure.
conus medullaris
This is the paths of communication between the spinal cord and specific regions of the body.
Spinal nerves
What are Two bundles of axons called?
Roots
Two bundles of axons connect each spinal nerve to a segment of the cord by even smaller bundles of axons called what?
rootlets
Relatively large diameter spinal cord segment
Cervical
Nearly circular but has less white matter and gray matter looks like it expands spinal cord segment
Lumbar
large amounts of gray matter but small amounts of white matter like it shrunk spinal cord segment
Sacral
a much smaller spinal cord segment
Coccygeal
Small diameter, a small amounts of gray matter like it shrunk
Thoracic
A spinal nerve divides into several branches. What do you call these branches?
rami
The human body has how many spinal nerves pairs ?
31 pairs
Are parts of the PNS, with parallel bundles of axons and neuroglial cells
Spinal Nerves
supplies the vertebrae, vertebral ligaments, blood vessels of the spinal cord, and meninges
meningeal branch
Which ramus serves the deep muscles and skin of the posterior surface of the trunk
Posterior Ramus
The skin is supplied by ____________ that carry nerve impulses from the skin into the spinal cord and brain.
somatic sensory neurons
