Biology Reference
In-Depth Information
developmental episodes in these two species. The growth episode con-
sidered here spans the time elapsed from the earliest developmental
group for which we have data (individuals who have any deciduous
teeth present but not the first permanent molar) to adulthood (indi-
viduals whose permanent dentition is fully erupted including both the
maxillary and mandibular third molars). We understand that a growth
analysis with only two points along a time continuum is insufficient,
but we present these data as an example. In addition, we remind the
reader that our data are cross-sectional and not longitudinal.
Growth of the face in these species is studied using six landmarks
located on the sagittal plane and right side of the face ( Figure 5.3 ) .
Facial growth of Cebus apella from immature to adult is represented
by the growth matrix, GM CA :
NSL
IDS
PMM
ZMS
MXT
PNS
NSL 0.00000
IDS 1.34498 .00000
PMM 1.23602 1.25348 0.00000
ZMS 1.23616 1.38671 1.43306 0.00000
MXT 1.22091 1.32611 1.31896 1.29656 0.00000
PNS 1.19061 1.31221 1.27509 1.25223 1.20850 0.00000
The distance between zygomaxillare superior (ZMS) and premaxil-
lary-maxillary junction (PMM) shows the largest magnitude of change
relative to all other linear distances. In addition, the growth matrix
shows that a relatively large degree of change has occurred between
intradentale superior (IDS) and all other landmarks. The amount of
growth occurring between nasale (NSL) and other landmarks (except-
ing that between NSL and IDS) is relatively small. A very small
amount of change occurs local to the distance between posterior nasal
spine (PNS) and maxillary tuberosity (MXT), a distance representing
the width of the posterior palate.
Facial growth from immature to adult Macaca fascicularis is sum-
marized in the growth matrix GM MF :
NSL
IDS
PMM
ZMS
MXT
PNS
NSL
0.00000
IDS
1.85141
0.00000
PMM
1.44763
1.30635
0.00000
ZMS
1.45993
1.99816
2.13650
0.00000
MXT
1.45347
1.71529
1.81614
1.51753
0.00000
PNS
1.32945
1.66516
1.64113
1.26350
1.48338
0.00000
 
Search WWH ::




Custom Search