Exam I Embrology of the Vertebral Column Flashcards
when does gastrulation occur or a 3-layered embryo form
third week in utero
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 embryonic structure gives rise to the somites
paraxial mesoderm
name the areas of cellular differentiation formed within the somite
sclerotome, myotome and dermatome
what are the names of the successive vertebral columns formed during development
membranous, cartilaginous, skeletal or osseous
migration of somite pair to surround the notochord forms what developmental feature
the pericordal 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 blastema
intersegmental artery
what forms between the sclerotomites of a pericordal blastema
the intersclerotomal fissure (fissure of von Ebner)
the intersclerotomal fissure (fissure of von Ebner) gives rise to what developmental feature
the perichordal disc
the union of a dense caudal sclerotomite and loose cranial sclerotome from adjacent perichordal blastema gives rise to what feature
the vertebral blastema
what vessels will be identified adjacent to the vertebral blastema
beginning in the 6th embryonic week
what is the name given to the replacement of mesoderm by cartilage
chondrofication
what are the names given to centers of chondrofication within the vertebral blastema
centrum center, neural arch center, transverse process center
how many centers of chondrification typically appear in the vertebral blastema
six…2 for the centrum, 2 for neural arches, 2 for transverse process
when does the embryonic disc form
second week in utero
what is the name given to the centers of ossification based on their time of appearance
primary centers appear in utero, secondary centers appear after birth
what is the earliest time that centers of ossification appear in cartilaginous vertebra
during the 7th embryonic week
what is the ratio of primary to secondary centers of ossification for a typical vertebra
3 primary to 5 secondary
what are the name given the primary centers of ossification for a typical vertebra
centrum centers and neural arch centers
what are the names/locations of the five secondary centers of ossification for a typical vertebra
tip of the transverse processes, tip of the spinous process, epiphyseal plate centers
what is the range of appearance for secondary centers of ossification of a typical vertebra
during puberty, typically ages 11-16
