Lumbar Spine/Typical Lumbar Spine L1-L4 Flashcards
Which segments of the spine are more prone to variation in morphology?
L1 and L5
What parts of the vertebra may be used to distinguish L1-L4 from L5?
vertebral body, pedicle, articular process, transverse process, spinous process
What is the generic shape of the typical lumbar vertebral body from the cranial view?
reniform or kidney-shaped
What would be the direction of the lumbar curve based on osseous features?
anterior (lordotic)
What accounts for the direction of the lumbar curve?
the vertebral body height and intervertebral disc have a greater anterior height than posterior height
What is the effect of againg on the vertebral body of a lumbar vertebrae?
decrease in height, increasein circumference
How many fibrous (amphiarthrosis) syndesmosis joint surfaces are on a typical lumbar?
four
How many joint surfaces are present on the vertebral body of a typical lumbar?
six
How many synovial joint surfaces are present on the vertebral body of a typical lumbar?
none
How many cartilaginous (amphiarthrosis) symphysis joint surfaces are on a typical lumbar vertebral body?
two
How many fibrous (amphiarthrosis) syndesmosis joint surfaces are on a typical lumbar vertebral body?
four
What muscles may attach to the first lumbar vertebral body?
psoas major and psoas minor
What muscle(s) may attach from the second down to the fourth lumbar vertebral body?
psoas major
Psoas minor will only attach to the vertebral body of which segments?
T12, L1
What is the name given to the ligaments that attach the vertebral body to articular process?
transforaminal ligaments
What ligaments attach the vertebral body to the transverse process?
corporotransverse ligaments
What corporotransverse ligaments are identified?
superior corporotransverse and inferior corporotransverse ligaments
What are the types of Hofmann ligaments?
anterior Hofmann, posterior Hofmann, lateral Hofmann ligaments and proximal root sleeve ligaments
Hofmann ligaments are identified in which regions along the vertebral column?
cervical - upper thoracic region and lumbar region
Cervical - upper thoracic Hofmann ligaments will attach what structures together?
dura mater to segments above
What is the highest level known to demonstrate Hofmann ligaments?
C6
What is the proposed function of the cervical - upper thoracic Hofmann ligaments?
resist caudal movementsof the dural sac; resist gravitational forces on the dura and cord
Lumbar Hofmann ligaments will attach what structures together?
dura mater to lower segment levels
What is proposed function of the lumbar Hofmann ligaments?
resist cranial movement of the dural sac during flexion
What is the proposed function of the proximal root sleeve ligaments?
resist displacement of the peripheral nerve system in the intervertebral formen