Flashcards in Intervertebral Foramen: Regional Characteristics Deck (25):
What are the average dimensions of the cervical intervertebral foramen?
about 10mm high and 5mm anterior to posterior
What is the relationship of cervical intervertebral foramen height to nerve root size?
the height increases but the nerve root size stays about the same from cranial to caudal
What parts of the cervical vertebra will modify the intervertebral foramen?
the lateral groove and uncinate process
What increases the depth or length of the intervertebral foramen in the cervical spine?
What is the location of the spinal nerve within the cervical intervertebral foramen?
toward the front and middle of the height of the cervical intervertebral foramen
What happens to cervical nerve roots between their origin from the spinal cord and exit from the intervertebral foramen?
they descend along the spinal cord
What is the relationship between aging and cervical spine nerve root characteristics?
the length of the nerve root increases as it descends from its apparent origin on the spinal cord, but the cross-sectional area of the nerve root decreases
What is the relationship between aging and cervical spine intervertebral foramen size?
the cross-sectional area diminishes after age 50
What are the specific attachment sites for a cervical spinal nerve?
the sulcus for the ventral primary ramus on the costotransverse bar and the vertebral artery
What is the average height of the thoracic intervertebral foramen?
What contributes to the anterior boundary of the thoracic intervertebral foramen?
the costocentral joint
What is the average height of the lumbar intervertebral foramen?
What is the amount of contribution of the intervertebral disc to the height of the lumbar intervertebral foramen?
What is the shape of the lumbar intervertebral foramen?
reniform or earlobe-shaped
What is the relationship of lumbar nerve root size to intervertebral foramen size above L4?
the nerve root size will account for less than 22% of the available space
What is the relationship of lumbar nerve root size to intervertebral foramen size below L4?
the nerve root size will account for up to 30% of the available space
Which are the largest spinal nerves?
L5 and S1
What increases the length of the intervertebral foramen at L5?
the lumbosacral tunnel
What forms the lumbosacral tunnel?
- lumbosacral lig.
- TVP of L5
- sacral ala
What condition is the result of encroachment on the L5 spinal nerve?
far out syndrome
What lig. may contribute to the loss of size in the lumbar intervertebral foramen?
What is the relationship between intervertebral disc herniation and lumbar spine nerves?
the intervertebral disc above the intervertebral foramen is usually the source of damage
What is unusual about the sacral intervertebral foramen compared to other intervertebral foramina?
a completely osseous boundary exists
What is more likely the cause of nerve irritation at the sacral intervertebral foramen?
the tilt or position of the entire sacrum relative to the pelvis