[ 163 ] 
IV. The Formation and Early Growth of the Bones of the Human Face. By George 
W. Callender, Lecturer on Anatomy at St. Bartholomew' s Hospital. Communicated 
by J. Paget, F.B.S. 
Received June 2, — Read June 18, 1868. 
I propose in the following notes to relate some observations respecting the formation 
and growth of the bones of the human face. It is not my purpose to consider minutely 
the process of ossification, but simply to mention such of my experiences as differ from 
the commonly received statements, or which seem to supply information regarding some 
few points with which we are as yet imperfectly acquainted, such as the growth of the 
maxillae, and the formation and eventual obliteration of the intermaxillary bones. 
Of the cartilaginous and membranous structures of the cranium, before ossification 
has commenced, two processes of cartilage, trabeculae cranii of Rathke, extend into the 
anterior division of the skull, forming by their union the frontal nasal process, and from 
between which the internasal cartilage is derived. Lateral masses, inflected lateral 
cartilages, represent the future ethmoid and inferior turbinate bones. 
The internasal cartilage bending or arching over on either side forms plates on which 
the nasal bones are developed, and is connected in front with the cartilages of the 
nose. In a foetus nine-tenths of an inch long* it is joined to the lateral cartilages by 
* This and all the specimens subsequently referred to are in the Museum of St. Bartholomew’s Hospital. 
The figures, 3-5 for example, are used to indicate the length of a foetus in inches and tenths of an inch. It 
seems best to distinguish each foetus by its length ; the following Table gives, as nearly as it is possible to 
determine it, the corresponding age in days and weeks in twenty cases. 
Length of foetus, in inches. 
Age, in weeks. 
Age, in days. 
•12 
3 
7 to 14 
•4 
6 
35 to 42 
•5 
7 
42 to 49 
•7 
8 
49 to 56 
} 
9 
56 to 63 
J 
1-5 . 
10 
63 to 70 
2-3 " 
1 
3 
1 
3-5 
3-7 ; 
!> 
12 to 16 
84 to 112 
3-8 
4 j 
1 
4-3 'j 
4-7 
6-5 
> 
16 to 20 
112 to 140 
6-7 1 
7 J 
9 1 
10 j 
22 to 24 
154 to 168 
MDCCCLXIX. 
Z 
