Topography
Sections pp. 29, 35
Vertebral column, development
a
b
c
Fig. 736 a-e
Regional characteristics of the vertebrae.
Only in the thoracic region of the vertebral column do
the lateral parts (labelled in red] remain separated and
form ribs.
a
First cervical vertebra, Atlas
b
Fourth cervical vertebra, Vertebra cervicalis IV
c
First thoracic vertebra, Vertebra thoracica I, with
corresponding ribs, Costae, and sternum, Sternum
d
Third lumbar vertebra, Vertebra lumbalis III
e
Sacrum, Os sacrum
Corpus
vertebrae
Epiphysis anularis’
Proc costalis
Proc.
spinosus
Epiphysis
anularis*
Proc. articularis [Zygapophysis]
superior
Proc. accessorius
Fig. 737
Vertebral development.
Demonstration of the appearance of primary ossification
centres in a lumbar vertebra (pedicle: second foetal month;
corpus: third to sixth foetal month).
Synostosis of the ossification centres of the vertebral arch
with those of the corpus occurs between the third and the
sixth year of life.
Fig. 738
Vertebral development.
Circular ossification centres 1= rims*) appear in the
epiphyses of the vertebrae during the eighth year of life and
fuse with the vertebral bodies until the eighteenth year of
life.
The central portions of the epiphyses remain as hyaline
cartilaginous laminae ** throughout life.
Secondary ossification centres (apophyses) develop at the
processes.
