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Jaw joint comparison in the mouse, chick and the marsupial Monodelphis. Skeletal preps. Red – bone stained by Alizarin Red. Blue – cartilage stained by Alcian Blue. (A) Mouse postnatal day (P) 0. (B) Chick embryonic day (E) 13. (C) Monodelphis P2. Arrows joints to the articulation point for the upper and lower jaws. Q, quadrate; A, articular; M, malleus; I, incus; S, squamosal; D, dentary.
