I30 A MANUAL OF ANATOMY 



superior border of its orbital plate. A portion of this suture lies 

 on the facial surface of the skull, and the other part lies on the 

 anterior and upper part of the outer wall of the orbit. Its direc- 

 tion is antero-posterior, and it is a serrated suture. It is in line 

 with the spheno-frontal suture. 



The lachrymo-maxillary suture connects the anterior border of 

 the lachrymal bone with the inner lip of the lachrymal groove on 

 the posterior border of the nasal process of the superior maxilla. 

 It lies on the anterior part of the inner wall of the orbit. Its direc- 

 tion is vertical, and it is a harmonic suture. The place of meeting 

 between the vertical lachrymo-maxillary and almost horizontal 

 fronto-maxillary sutures coincides with the dacryon. 



The lachrymo-ethmoidal suture connects the posterior border of 

 the lachrymal bone with the anterior border of the os planum, or 

 orbital plate, of the ethmoid. It lies on the inner wall of the 

 orbit. Its direction is vertical, and it is a harmonic suture. 



The orbito-spheno-ethmoidal suture connects the posterior border 

 of the OS planum, or orbital plate, of the ethmoid with the sphenoidal 

 spongy bone, or with the anterior margin of the lateral surface of 

 the body of the sphenoid bone. It lies vertically on the back part 

 of the inner wall of the orbit, and it is a harmonic suture. 



There are two other spheno-ethmoidal sutures, which, however, are not 

 orbital. One of these connects the ethmoidal spine of the sphenoid bone 

 and the contiguous portions of the anterior border of the superior surface of 

 the body with the posterior border of the cribriform plate of the ethmoid. 

 It lies in the anterior fossa of the internal surface of the base of the skull, 

 and is irregularly continuous, on either side, with the orbito-spheno-frontal 

 suture, which connects the small wing of the sphenoid with the orbital plate 

 of the frontal. It is a limbous suture, and it may be called the basal spheno- 

 ethmoidal suture. The remaining spheno-ethmoidal suture connects the 

 sphenoidal crest of the sphenoid with the posterior border of the perpendi- 

 cular plate of the ethmoid bone. It is situated at the back part of the osseous 

 nasal septum, its direction being vertical, and it is a harmonic suture. It 

 may be called the septal spheno-ethmoidal suture. 



The fronto - lachrymal suture connects the internal angular 

 process of the frontal bone and the contiguous part of the outer 

 lip of the bevelled and excavated inner border of its orbital plate, 

 which lies close behind the internal angular process, with the 

 superior border of the lachrymal bone. It is situated on the anterior 

 part of the inner wall of the orbit, where that wall meets the roof; 

 its direction is antero-posterior, and it is a harmonic suture. 



The fronto-ethmoidal suture connects the inner bevelled and 

 excavated border of the orbital plate of the frontal bone with the 

 superior excavated border of the lateral mass of the ethmoid. It 

 is situated on the inner wall of the orbit, where that wall meets the 

 roof. Its direction is antero-posterior, and it is continuous with 

 the fronto-lachrjmial suture. It may be regarded as a much- 

 modified harmonic suture. The anterior and posterior ethmoidal, 

 or internal orbital, canals lie transversely along its course. 



The ethmo-maxillary suture connects the inferior border of the 

 OS planum, or orbital plate, of the ethmoid with the inner border 



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