NCIt definition : One of the bones of the orbit, situated rostrally to the basilar part of the occipital
bone; it is present during fetal development and later fuses to form the anterior
portion of the sphenoid bone.;
Alternative definition : CDISC: One of the bones of the orbit, situated rostrally to the basilar part of the
occipital bone; it is present during fetal development and later fuses to form the
posterior portion of the sphenoid bone.;