Arthrology of the Vertebral Column Flashcards
What is the maximum number of common ligaments identified with a vertebral couple?
8
What is the reason the nine common ligaments are identified but only eight will be attached at any specific vertebral couple?
Ligamentum nuchae and supraspinous ligaments attach to the spinous tubercles, but only one of these will be identified at a single vertebral couple
Which common ligaments will attach to the vertebral body?
Anterior longitudinal ligament
Intervertebral disc
Posterior longitudinal ligament
What common ligaments will attach to the vertebral arch?
Ligamentum flavum
What is the number of true intervertebral discs identified in the adult?
23
In the adult, which vertebral levels will demonstrate a true intervertebral disc?
C2-S1
What is the intervertebral disc histologically composed of?
Cells
Collagen fibers
Hydrated proteoglycan gel
What is the cervical nucleus pulposus composed of?
Fibrocartilage
What is the water concentration in the lumbar nucleus pulposus at birth and after thirty?
Birth = 88% 30 = 70%
What is the consequence of non-aggregated glycosaminoglycans in the lumbar nucleus pulposus?
Nucleus pulposus will lose water under deformation conditions
What cell is associated with the nucleus pulposus until about age eleven?
Notochord cells
What cells are associated with the mature nucleus pulposus?
Reticulocyte-fibroblast
Chondroblast
Which type of collagen is dominant in the nucleus pulposus?
Collagen type II
What general tissue location is described as having an abundance of collagen type II fibers?
Cartilage
What is the role of collagen type II fibers based on locations where it is dominant?
It appears to be related to tissues having a deformation - reformation ability
What is the appearance of the cervical annulus fibrosus?
Horse-shoe with the anterior margin thick and the lateral margins tapering to the uncinate processes
Posterior margin is thin
What compensates for the thinness of the posterior part of the cervical annulus fibrosus?
Posterior longitudinal ligament
What is the organization of the lumbar annulus fibrosus?
Has 12-14 concentric cylindrical lamellae
What is the water by concentration in the lumbar annulus fibrosus at birth and after thirty?
Birth = 78% 30% = 70%
What is the organizational pattern for the glycosaminoglycans int he lumbar annulus fibrosus?
Typically have a binding site for hyaluronic acid and thus aggregated
Which type of collagen is dominant in the annulus fibrosus?
Collagen type I
What is the organizational pattern for collagen fibers in the annulus fibrosus?
Parallel with one another in a single lamellae and angled
What is the organization of collagen fibers between lamellae?
Collagen fibers will be angled in the opposite direction such that a spiral - counterspiral organization is observed
What is the average angle of collagen fibers within the annulus fibrosus?
Average 50 to 60 degrees
What is the origin for the cells of the annulus fibrosus?
Sclerotomites
What part of the vertebral body will the cartilage end plate cover?
Cancellous bone at the top or bottom of the vertebral body
What is the principal type of collagen fiber within the cartilage end plate?
Type II collagen fiber
What is the direction of collagen fibers within the cartilage end plate?
Collagen fibers are aligned anterior to posterior
What is the earliest indicator of intervertebral disc pathology or degeneration?
Changes in the histology of the cartilage end plate
What is the cartilage end plate derived from?
Epiphyseal plate
What is the thickest part of the cartilage end plate?
Around the periphery
What is the area of maximum metabolic activity in the intervertebral disc?
Transition zone
What are the types of receptor endings in the intervertebral disc?
Nociceptors
Proprioceptors
What is the relationship between size of the intervertebral disc and receptor endings?
Larger the disc, the greater the variety or receptor endings
The recurrent meningeal/sinu-vertebral/sinus vertebral nerve has typically been shown to originate from which source?
Gray ramus communicans
What part of the intervertebral discis innervated by the recurrent meningeal/sinu-vertebral/sinus vertebral nerve?
Outer lamellae of the annulus fibrosus atthe posterior part of the intervertebral disc
What forms the anterior neural plexus of the vertebral column?
Fibers from the ventral primary ramus
What forms the lateral neural plexus of the vertebral column?
Fibers from the ventral primary ramus
Fibers from the white ramus communicans
Fibers from the paradiscal ramus communicans
Fibers from the gray ramus communicans
What is the name given to the white ramus communicans which becomes embedded within the annulus fibrosus of the intervertebral disc?
Paradiscal ramus communicans
What part of the intervertebral disc is innervated by fibers from the paradiscal ramus communicans?
Outer lamellae of the annulus fibrosus at the lateral part of the intervertebral disc
What is formed within the perichordal blastema between the sclerotomites?
Intrasclerotomal fissure or fissure of von Ebner
What does the intrasclerotomal fissure or fissure of von Ebner become?
Perichordal disc
What will the dense sclerotomite become?
Upper part of the vertebral segment forming below
What is the appearance of the posterior longitudinal ligament in the lumbar spine?
Hourglass shaped along its lateral margins
What is the innermost layer of the posterior longitudinal ligament called?
Perivertebral ligament
What innervated the posterior longitudinal ligament?
Posterior neural plexus formed by fibers from the recurrent meningeal nerve/sinus vertebral nerve/sinu-vertebral nerve
Where is ossification of the posterior longitudinal ligament most commonly identified?
Cervical spine with an 80% incidence
What is the gender, age, and ethnic bias associated with ossification of the posterior longitudinal ligament?
Greater in males over 50 and has higher incidence in the Japanese
What is the name given to the ligamentum flavum based on appearance and histology?
Yellow elastic ligament
What fibers are most ligaments made of?
Collagen type I fibers which are whitish in appearance
What is the function of the ligamentum flavum?
Brakes or limits flexion of the vertebral column
What is now thought to be a major function of the ligamentum flavum?
Early prime factor in extension of vertebral column
Where is ossification of the ligamentum flavum most commonly identified?
Thoracic spine or thoracolumbar transition zone
What is the relationship between the capsular ligament and mobility?
The more lax/loose the capsular ligament is, the greater the motion of the joint
What regions of the vertebral column demonstrate the greatest laxity of capsular ligaments?
Cervical
Lumbar
What is the status of the human interspinous ligament compared with other common ligaments?
Poorly developed as ligaments although collagen fibers are present
What is the status of the cervical interspinous ligament?
Lacking
Poorly developed
Considered the deep anterior part of the ligamentum nuchae
What is now thought to be the major function of the interspinous ligaments?
More likely a proprioceptive transducer for the spinal reflex
What are the layers of the ligamentum nuchae?
Superficial layer
Deep layer
What is the name given to the superficial layer of the ligamentum nuchae?
Funicular layer or part
What is the name given to the deep layer of the ligamentum nuchae?
Lamellar layer or part
What are the attachment sites for the superficial layer of the ligamentum nuchae?
EOP
External occipital crest
SPinous tubercle of C7