Muscles of mastication, tongue and hyoid bone, shown with skull and in isolation, in 8 numbered illustrations. 2 illustrations of skull, mandible divided to show medial and lateral pterygoid muscles, lateral and medial views. 2 illustrations of the tongue, shown in isolation with styoid process and mastoid process, showing genioglossus and styloglossus muscles. Lateral views. 4 illustrations of the hyoid bone, superior, inferior, lateral and anterior views.