Which anatomical feature is assessed for delayed closure in certain developmental disorders?

The anatomical feature that is assessed for delayed closure in certain developmental disorders is the fontanelles. Fontanelles are the soft spots on an infant's skull where the bones have not yet fused. They are made of fibrous tissue and allow for flexibility during childbirth, as well as for the growth of the brain as the child develops.

In particular, the anterior fontanelle remains open for a significant time during early childhood, and its closure is a critical developmental milestone. Delayed closure of the fontanelles can indicate various developmental issues, such as conditions affecting growth and brain development. Monitoring these regions can help healthcare professionals identify potential abnormalities and take appropriate measures.

The other options relate to different aspects of skull anatomy and do not directly correlate with the significant developmental assessment of fontanelles, which are specifically observed during pediatric evaluations.