1

atlas

2

axis

3

fifth cervical

4

seventh cervical with supernumerary ribs

5

middle thoracic

6

first thoracic, with costal arch and sternum attached

7

therd lumbar

8

first lumbar with supernumerary rubs

9

fifth lumbar

10

first sacral

11

lumbo-sacral vertebra

12

fourth sacral vertebra in a young subject

13

four coccygeal vertebrae

1

s

spine

n

neural arch

c'

the space occupied by the dens, or displaced centrum

h

anterior arch

ar

superior articular surface

2

c"

dens

ar

superior articular surface

z'

inferior articular process

3

c

corpus

z, z'

superior and inferior articualr processes

4

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 top be superadded to the transverse process of the vertebra

5

t

transverse process with costal fovea

cc

fovea costalis

4 and 6

v

vascular interval

ct

costo-transverse

cc

costo-central articulations

co

first rib

7

m

processus mamillaris

a

processus accessorius

t

processus transversus

8

co, co'

supernumerary ribs

10

l

pars lateralis

11

e'

place of pars lateralis remaining undeveloped in this instance

12

tl

transverse process and pars lateralis, which unite wit hthe corresponding parts on the preceding vertebrae

f, f'

anterior and posterior sacral foramina thus formed

13

c

corpus which alone remains in the lower coccygeal vertebrae