Lower Jaw of Frog (mandibular Arch)
The lower jaw consists of three pairs of bones, which together form a mandibular arch. These bones are angulosplenial, dentary and mentomeckelian bones. The latter bones are very small and round and located exactly in the centre of the mandibular arch between the two dentary bones. The dentary and angulosplenial are paired membrane bones. The anterior end of dentary is swollen and concave, while the posterior part is thin, flat, and pointed. The angulosplenial is the longest bone of the skull. It is more or less sickle shaped. Posteriorly it is somewhat thick or swollen while anteriorly it is long and slightly curved and pointed. On the inner side of the thick posterior region there is a bony coronary process.
The posterior ends of the mandibular arch are articulated with the quadrate cartilages of the upper jaw in such a way that the lower jaw can move freely and open the mouth widely and fully. This type of attachment of the lower jaw with the upper jaw is called autostylic suspension.
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