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File:1911 EB Chicken skull.png


English: Here the opisthotic bone appears in the occipital region, as in the adult Chelonian. (After W. K. Parker.) bo = Basi-occipital, bt = Basi-temporal, eo = Opisthotic, f = Frontal, fm = Foramen magnum, fo = Fontanella, oc = Occipital condyle, op = Opisthotic, p = Parietal, pf = Post-frontal, sc = Sinus canal in supra-occipital, so = Supra-occpital, sq = Squamosal, 8 = Exit of vagus nerve. Cleaned version of scanned EB image taken from:
Date 1911
Source Encyclopædia Britannica Eleventh Edition, Vol. 4, Page 521
Author Encyclopædia Britannica
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