The lingual muscles in chicken are investigated brifly, They may be classified according to their width into two classes. The first class includes three wide muscles characterizing by their attachment to the rostral basibranchial bone These muscles are the lateral hypoglossal, laryngeal basibranchial and serpihyoid. The second class consists of two narrow muscles characterizing by their division into a fleshy and tendinous parts. These muscles are the medial hypoglossal and the ceratoglossal. According to their attachment, the lingual muscles can be also divided into two groups. The first group includes three muscles arising and inserting in the different parts of the hyoid bone, These muscles are medial and lateral hypoglossal as well as ceratoglossal, they act mainly on the apex of the tongue. The second group is represented by two muscles extending between the hyoid bone and the larynx (laryngeal basibranchial muscle) or the mandible (Serpihyoid muscle). The ceratoglossal muscle is the longest lingual muscle but the lateral hypoglossal is the shortest one.
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