M1 Reading Guide 3 Flashcards
What fascia plays an important functional role in mechanical stability of the low back, including the SI joint?
thoracolumbar fascia
The thoracolumbar fascia is most extensive here
lumbar region
layers of the thoracolumbar fascia
3: anterior, middle, posterior layers
What do the layers of thoracolumbar fascia do?
partly surround and compartmentalize the posterior muscles of the low back
Where are the anterior and middle layers of the thoracolumbar fascia anchored?
- medially to transverse processes of lumbar vertebrae
- inferiorly to iliac crests
What does the posterior layer of the thoracolumbar fascia cover?
- posterior surface of erector spinae
- latissimus dorsi
Where does the posterior layer of the thoracolumbar fascia anchor?
- spinous processes of all lumbar vertebrae and sacrum
- ilium near the PSIS
thoracolumbar fascia: posterior attachments provide
mechanical stability to the SAJ
thoracolumbar fascia: Where do the posterior and middle layers fuse?
at lateral margins
Fusion of the thoracolumbar fascia at the lateral margins produces a:
lateral raphe
Fusion of the thoracolumbar fascia: lateral raphe blends with fascia of the:
- transverse abdominus
- obliquus internus abdominus
What is the location of the TrA relative to the other abdominals?
most internal (deepest) muscle of the abs
What is the functional advantage of the broad attachments of the TrA?
- increases segmental stiffness
- motor control of the “neutral zone”
- stabilizes the spine (like a corset)
What are the anterior components of a vertebral segment?
- vertebral body
- interbody joint
- disc
What types of bone make up the vertebral body?
- cortical bone
- trabecular bone
