RAD 232 lumbar and sacrum/coccyx anatomy

with reference to the MSP how do zygapophyseal jt of lumber vertebrae open?

30-50 degrees posteriorly

how does the L4 and L5 vertebrae differ?

thicker lamina and pedicle in L5

Channels in the sacrum that allow the sacral nerves and blood vessels to pass through

sacral foramina

unique features of the lumbar

transverse process smaller

pars interarticularis

projects superiorly from the posterolateral aspect of the 1st coccygeal segment

coccygeal cornua

the size of the lumbar spine allows for more what?

more space for nerves to move about

which parts of the sacrum form the JTs with the ilia of the pelvis

articular surfaces

with reference to MSP how many degrees and in which direction do SI jt open?

25-30 degrees anteriorly

continuation of vertebral canal directly behind the bodies of the sacral segments

sacral canal

formed by the fusion of 3 to 5 rudimentary vertebrae

coccyx

Lumbar differs from cervical and thoracic vertebrae because lumbar vertebrae have

broad large spinous process

how many sacral foramina

8

superior anterior margin, the base of the sacrum has a prominent ridge

promontory

lies between the superior and inferior articular process bilaterally at each vertebral level. can be described as the region between 2, 1 superior and 1 inferior zygapophyseal JT

Pars interarticularis

what’s the largest lumbar vertebrae

L5

How many vertebrae in the lumbar?

5

the lumbar occupies what region

posterior abdominal region

Largest movable segment of the human spine

the 5 lumbar vertebrae

part of the lamina between articular processes

par interarticularis

which spinal canal is the largest cervical, thoracic or lumbar?

lumbar

how does the coccyx curve from it’s articulation with the sacrum

anteriorly and inferiorly

2 processes that project inferiorly from the posterolateral aspect of the last sacral segment

sacral cornua

innermost part of an intervertebral disc

nucleus pulposus

female sacrum shorter wider and more curved

male sacrum longer narrow and less curved

flat round cushion, acts as shock absorber

intervertebral disk

serves as attachment for diaphragm

top of lumbar

outermost part of an intervertebral disc

annulus fibrous

consist of 5 fused vertebrae and is large and triangular in shape

sacrum

the sacrum is a group of specialized vertebrae that connects the spine to the

pelvis

the sacrum is wedge between iliac bones of pelvis which is what articulation

sacroiliac JT

anatomic features of the sacrum

promontory, cornu, foramina, and canal

What if the nucleus pulposus made of ?

semigelantinous Material

What’s the most common number of vertebrae for a coccyx?

4