Mexican Sign Language and Culture
Mexican Sign Language is a sign language used by Deaf community in Mexico. The Mexican terms in Spanish are known as: "Lenguaje de Signos Mexicano" and "Lengua de Señas Mexicana" (LMS).
Like signed languages around the world, LMS is a human language in its own right, fully capable of expressing any thoughts as any other language. It has its own vocabulary and grammar which is independent from Spanish.
LMS is believed to be more derived from Old French Sign Language. LMS and Spanish Sign Language are unrelated.
There is another sign language used in some Mayan communities in the Yucatan.
Resources / Related readings
Adams, Margarita. Historia De La Educacion De Los Sordos En Mexico.
"Mexican Sign Language." Summer Institute of Linguistics in Mexico. http://www-01.sil.org/mexico/lenguajes-de-signos/00i-signed-languages.htm