posterior fontanelle


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pos·te·ri·or fon·ta·nelle

[TA]
a triangular interval at the union of the lambdoid and sagittal sutures where occipital angles of the parietal bones meet the occipital.
References in periodicals archive ?
Next, the clinician exerts pressure with the tips of the fingers to rotate the posterior fontanelle upward and toward the symphysis pubis.
1) It is located in the lateral wall of the middle meatus, usually in the anterior or posterior fontanelle where the medial wall of the maxillary sinus is membranous.
The maxillary sinus ostium was opened, and the posterior fontanelle mucosa was removed to create a large antrostomy opening.
The posterior fontanelle was opened with a sickle knife, and the backward-cutting forceps were reintroduced to enlarge the antrostomy to join the natural ostium.
The posterior fontanelle is the unossified area of the skull at the junction of the sagittal and lambdoidal sutures.
2] The boundaries of the posterior fontanelle include the posterior end of the uncinate process anteriorly and the palatine bone posteriorly.
Unlike the anterior fontanelle, the posterior fontanelle serves as a relatively safe surgical landmark during a middle meatal antrostomy.
Initially, this was thought to represent an accessory ostium of the maxillary sinus in its posterior fontanelle, but probing during surgery confirmed that it arose from the ethmoid bulla.

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