1

Atlas. (s, spine;n, neural arch; c', the space occupied by the dens, or displaced centrum; h, anterior arch; ar, superior articular service)

2

Axis. (c'', dens; ar, superior articular surface;z', inferior articular process)

3

Fifth cervical. (c, corpus;z, z', superior and inferior articular processes)

4

Seventh cervical with supernumerary ribs. (t, transverse process; v, vertebrarterial foramen; co, movable right supernumerary or cervical rib; x, with a dotted line marking the place where an ankylosed rib on the left side may be considered to be superadded to the transverse process of the vertebra)

5

Middle thoracic. (t, transverse process with costal fovea; cc, fovea costalis)

6

First thoracic, with costal arch and sternum attached. (v, vascular interval;CT, costo-transverse, cc, costo-central articulations; co, first rib)

7

Third lumbar. (m, processus mamillaris; a, processus accessorius; t, processus transversus)

8

First lumbar with supernumerary ribs. (co, co', supernumerary

9

Fifth lumbar

10

First sacral. (l, pars lateralis)

11

Lumbosacral vertebra (e', place of pars lateralis remaining undeveloped in this instance)

12

Fourth sacral vertebra in young subject. (tl, transverse process and pars lateralis, which unite with the corresponding parts on the preceding vertebrae; f, f', anterior and posterior sacral foramina thus formed)

13

Four coccygeal vertebrae. (c, corpus which alone remains in the lower coccygeal vertebrae)