Posterior fontanelle
Encyclopedia
The posterior fontanelle (or occipital fontanelle) is a gap between bones in the human skull, triangular in form and situated at the junction of the sagittal suture
Sagittal suture
The sagittal suture is a dense, fibrous connective tissue joint between the two parietal bones of the skull. The term is derived from the Latin word Sagitta, meaning "arrow". The derivation of this term may be demonstrated by observing how the sagittal suture is notched posteriorly, like an arrow,...

 and lambdoidal suture. It generally closes in 6-8 weeks from birth. A delay in closure is associated with congential hypothyroidism
Hypothyroidism
Hypothyroidism is a condition in which the thyroid gland does not make enough thyroid hormone.Iodine deficiency is the most common cause of hypothyroidism worldwide but it can be caused by other causes such as several conditions of the thyroid gland or, less commonly, the pituitary gland or...

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