"The C3-L5 vertebrae typically have three primary ossification centres that start appearing at 9 weeks in utero and finish primary ossification by one year 1-4:"
"The primary ossification centres first appear at the cervicothoracic junction at 9 weeks in utero and are followed by upper cervical then thoracolumbar vertebrae with the primary ossification centres of the lumbar vertebral arches the last to appear at approximately 14 weeks in utero 3."
"For the C3-L5 vertebrae there are five secondary ossification centres that appear at puberty and fuse by 25-30 years 1-4:"
"The C3-L5 vertebrae typically have three primary ossification centres that start appearing at 9 weeks in utero and finish primary ossification by one year 1-4:"
"The primary ossification centres first appear at the cervicothoracic junction at 9 weeks in utero and are followed by upper cervical then thoracolumbar vertebrae with the primary ossification centres of the lumbar vertebral arches the last to appear at approximately 14 weeks in utero 3."
Expected headings
"Primary ossification centres"
"Secondary ossification centres"
"There are some differences for C1 and C2 1-3:"