vertebral column part 2 ex. 1 QQ Flashcards
what are the 3 layers of the embryo called?
ectoderm, mesoderm and endoderm
invagination of the ectoderm along the primitive streak gives rise to what embryonic structure?
notochord
what is the name given to the mesoderm that will give rise to the vertebral column?
paraxial mesoderm
what does paraxial mesoderm give rise to that will form the vertebral column?
somites
name the areas of cellular differentiation formed within the somite
sclerotome, myotome and dermatome
what part of the somite will give rise to the vertebral column?
sclerotome
list in order the names of the successive vertebral columns formed during development
membranous, cartilaginous, skeletal or osseous
migration of the sclerotomes to surround the notochord forms what developmental feature?
perichordal blastema
the perichordal blastema gives rise to what processes?
neural processes and costal processes
what is the name of the artery located between adjacent perichordal blastemae?
intersegmental artery
cell proliferation within the perichordal blastema will result in what features?
a loose cranial sclerotomite and a dense caudal sclerotomite
what forms between the sclerotomites of a perichordal blastema?
the intrasclerotomal fissure (fissure of von ebner)
what is the earliest embryonic feature that will identify the position of the adult intervertebral disc?
the intrasclerotomal fissure (fissure of von ebner)
the union of a dense caudal sclerotomite and a loose cranial sclerotomite from adjacent perichordal blastemae gives rise to what feature?
the vertebral blastema
what vessel will be identified adjacent to the vertebral blastema?
the segmental artery