mesectoderm

noun

mes·​ec·​to·​derm ˌmez-ˈek-tə-ˌdərm  ˌmēz- 

ˌmēs-,

ˌmes-

: the part of the mesenchyme derived from ectoderm especially of the neural crest that gives rise to pigment cells, the meninges, and most of the branchial cartilages

mesectodermal

-ˌek-tə-ˈdər-məl

adjective

or mesectodermic

-ˈdər-mik