Mastoid fontanelle
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The mastoid or posterolateral fontanelles are paired bilateral soft membranous gaps (fontanelles) at the junction of the parietomastoid, occipitomastoid, and lambdoid sutures. Each mastoid fontanelle persists until the second year of life, after which it is known as the asterion. It can be used as an additional sonographic window for performing cranial ultrasound to improve the visualisation of the posterior fossa.
-<p>The <strong>mastoid</strong> or <strong>posterolateral fontanelles</strong> are paired bilateral soft membranous gaps at the junction of the <a href="/articles/parietomastoid-suture">parietomastoid</a>, <a href="/articles/occipitomastoid-suture">occipitomastoid</a>, and <a href="/articles/lambdoid-suture">lambdoid</a> sutures. Each mastoid fontanelle persists until the second year of life, after which it is known as the <a href="/articles/asterion">asterion</a>. It can be used as an additional sonographic window for performing <a href="/articles/head-ultrasound">cranial ultrasound</a> to improve visualisation of the posterior fossa.</p>- +<p>The <strong>mastoid</strong> or <strong>posterolateral fontanelles</strong> are paired bilateral soft membranous gaps (<a title="Fontanelle" href="/articles/fontanelle">fontanelles</a>) at the junction of the <a href="/articles/parietomastoid-suture">parietomastoid</a>, <a href="/articles/occipitomastoid-suture">occipitomastoid</a>, and <a href="/articles/lambdoid-suture">lambdoid</a> sutures. Each mastoid fontanelle persists until the second year of life, after which it is known as the <a href="/articles/asterion">asterion</a>. It can be used as an additional sonographic window for performing <a href="/articles/head-ultrasound">cranial ultrasound</a> to improve the visualisation of the posterior fossa.</p>