Intervertebral Disc: Classification & Embryology

Question 1

Based on histology, what is the classification of the intervertebral disc?

Answer 1

A cartilaginous (amphiarthrosis) symphysis

Question 2

What are the divisions of the embryonic somite?

Answer 2

Sclerotome
Myotome
Dermatome

Question 3

What structure is formed following migration of sclerotomes to surround the notochord?

Answer 3

Perichordal Blastema

Question 4

What is formed within the perichordal blastema between the sclerotomites?

Answer 4

Intrasclerotomal Fissure or Fissure of von Ebner

Question 5

What does the intrasclerotomal fissure or fissure of von Ebner become?

Answer 5

Perichordal Disc

Question 6

What will the dense sclerotomite become?

Answer 6

Upper part of the vertebral segment forming below

Question 7

What structures forms following migration and subsequent mixing of the sclerotomites?

Answer 7

Vertebral Blastema

Question 8

What part of the intervertebral disc will the notochord form?

Answer 8

Nucleus Pulposus

Question 9

What part of the intervertebral disc will the perichordal disc form?

Answer 9

Annulus Fibrosus

Question 10

What is the earliest indicator of the position of the adult intervertebral disc?

Answer 10

Intrasclerotomal Fissure or Fissure of von Ebner