| The lenticular process is actually derived from mesenchyme attributed to the second branchial. |
| There is some mesenchyme in the core toward the base, however, they are very different in structure. |
| The branchial arches begin as cylindrical cores of mesenchyme sandwiched between continuous sheets of epidermal ectoderm and internal endoderm. |
| Mutations that disrupt the signaling interactions between epithelium and the underlying mesenchyme can cause eyelid closure defects. |
| The mesoderm also provides the mesenchyme from which organ development becomes possible. |
| The critical process depends upon whether the ectoderm can contact a condensate of specialized mesenchyme called the dermal papillae. |
