They contribute to the formation of the auditory meatus, and of the right and left carotid canals which accompany the eustachian tubes.
Eo, Opisthotic. prp, Pterygoid process of sphe eu, Eustachian tube.
Eu, Eustachian tube.
The basi-pterygoids (bpg) are mere knobs, and the common eustachian opening is seen between them.
3.) The middle ear communicates with the mouth by the Eustachian tubes, which pass between the basisphenoid and basioccipital bones, and unite upon the ventral side of the sphenoid, a little behind its articulation with the pterygoids, where they open into the mouth cavity by a short membranous duct.
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