Ripe <a href="https://en.wikipedia.org/wiki/Chicken" class="extiw" title="en:Chicken">Chick</a>’s head, 1¼ in. long. (After <a href="https://en.wikipedia.org/wiki/William_Kitchen_Parker" class="extiw" title="en:William Kitchen Parker">W. K. Parker</a>.)<br><p><i>as</i>, Alisphenoid.<br><i>bo</i>, Basi-occipital.<br><i>bt</i>, Basi-temporal.<br><i>dpx</i>, Dentary process of premaxilla.<br><i>eo</i>, Opisthotic.<br><i>eu</i>, Eustachian tube.<br><i>f</i>, Frontal.<br><i>fm</i>, Foramen magnum.<br><i>j</i>, Jugal.<br><i>l</i>, Lacrymal.<br><i>mx</i>, Maxilla.<br><i>mxp</i>, Maxillo-palatine process.<br><i>oc</i>, Occipital condyle.<br><i>pa</i>, Palatine.<br><i>pf</i>, Post-frontal.<br><i>pg</i>, Pterygoid.<br><i>pn</i>, Prenasal cartilage.<br><i>ppx</i>, Palatine process of pre-maxillary.<br><i>prp</i>, Pterygoid process of sphenoid.<br><i>qj</i>, Quadratojugal.<br><i>so</i>, Supra-occipital.<br><i>sq</i>, Squamosal.<br><i>ty</i>, Tympanic cavity.<br><i>v, Vomer.<br></i>
8, Exit of vagus nerve.<br>
9, Exit of hypoglossal nerve.<br></p>
<small>Illustration from 1911 Encyclopædia Britannica, article <a href="https://en.wikisource.org/wiki/1911_Encyclop%C3%A6dia_Britannica/Bird" class="extiw" title="s:1911 Encyclopædia Britannica/Bird">Bird</a></small>
Encyclopædia Britannica, 1911
<a href="https://en.wikipedia.org/wiki/Encyclop%C3%A6dia_Britannica_Eleventh_Edition" class="extiw" title="en:Encyclopædia Britannica Eleventh Edition">Encyclopædia Britannica Eleventh Edition, Vol. 3, Page 960</a> <a href="//commons.wikimedia.org/w/index.php?title=File:EB1911_-_Volume_03.djvu&amp;page=983" class="image"><img alt="EB1911 - Volume 03.djvu" src="https://upload.wikimedia.org/wikipedia/commons/thumb/c/c8/EB1911_-_Volume_03.djvu/page983-100px-EB1911_-_Volume_03.djvu.jpg" decoding="async" width="100" height="137" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/c/c8/EB1911_-_Volume_03.djvu/page983-150px-EB1911_-_Volume_03.djvu.jpg 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/c/c8/EB1911_-_Volume_03.djvu/page983-200px-EB1911_-_Volume_03.djvu.jpg 2x" data-file-width="1984" data-file-height="1991"></a>