From which tissue source does the connective tissue of glands derive?

From which tissue source does the connective tissue of glands derive?

• A. neural crest cell-enriched mesenchyme
• B. endodermal mesenchyme
• C. ectodermal mesenchyme
• D. mesodermal connective tissue

Answer: (A)

The connective tissue that supports glands in the head and face comes from neural crest–derived mesenchyme. Neural crest cells originate from the ectoderm but migrate extensively into the developing pharyngeal arches, where they differentiate into much of the craniofacial connective tissue, including the stroma around glands. So, even though the glandular epithelium itself may arise from endodermal or ectodermal origins, the connective tissue that envelops and supports those glands is formed by neural crest–derived mesenchyme. Endodermal or general mesodermal sources don’t account for this craniofacial connective tissue, and while ectoderm contributes broadly, the specific lineage here is neural crest–derived mesenchyme.

The connective tissue that supports glands in the head and face comes from neural crest–derived mesenchyme. Neural crest cells originate from the ectoderm but migrate extensively into the developing pharyngeal arches, where they differentiate into much of the craniofacial connective tissue, including the stroma around glands. So, even though the glandular epithelium itself may arise from endodermal or ectodermal origins, the connective tissue that envelops and supports those glands is formed by neural crest–derived mesenchyme. Endodermal or general mesodermal sources don’t account for this craniofacial connective tissue, and while ectoderm contributes broadly, the specific lineage here is neural crest–derived mesenchyme.