1130 



SPLANCHNOLOGY 





The Chondroglossus is sometimes described as a part of the Hyoglossus, but is 

 separated from it by fibers of the Genioglossus, which pass to the side of the 

 pharynx. It is about 2 cm. long, and arises from the medial side and base of the 

 lesser cornu and contiguous portion of the body of the hyoid bone, and passes 

 directly upward to blend with the intrinsic muscular fibers of the tongue, betwe 

 the Hyoglossus and Genioglossus. 



A small slip of muscular fibers is occasionally found, arising from the cartila^ 

 triticea in the lateral hyothyroid ligament and entering the tongue with the hinder- 

 most fibers of the Hyoglossus. 



The Styloglossus, the shortest and smallest of the three styloid muscles, arises 

 from the anterior and lateral surfaces of the styloid process, near its apex, and 

 from the stylomandibular ligament. Passing downward and forward between the 

 internal and external carotid arteries, it divides upon the side of the tongue 

 into two portions: one, longitudinal, enters the side of the tongue near its 

 dorsal surface, blending with the fibers of the Longitudinalis inferior in front of 

 the Hyoglossus; the other, oblique, overlaps the Hyoglossus and decussates with 

 its fibers. 



The intrinsic muscles (Fig. 1020) are: 



Longitudinalis superior. 

 Longitudinalis inferior. 



Transversus. 

 Verticalis. 



The Longitudinalis linguae superior (Superior lingualis) is a thin stratum of oblique 

 and longitudinal fibers immediately underlying the mucous membrane on the 

 dorsum of the tongue. It arises from the submucous fibrous layer close to the 

 epiglottis and from the median fibrous septujn, and runs forward to the edges 

 of the tongue. 



Longitudina- 

 superior 



Papilla 

 of tongue 



Insertion of Transversus. 



Styloglossus 

 Hyoglossus 

 Longitudinalis inferior 



Vertical fibers of Genio- 

 glossus intersecting 

 Transversus 



Septum 



Lingual artery 



FIG. 1020. Coronal section of tongue, showing intrinsic muscles. (Altered from Krause.) 



The Longitudinalis linguae inferior (Inferior lingualis) is a narrow band situated 

 on the under surface of the tongue between the Genioglossus and Hyoglossus. 

 It extends from the root to the apex of the tongue: behind, some of its fibers are 

 connected with the body of the hyoid bone ; in front it blends with the fibers of 

 the Styloglossus. 



The Transversus linguae (Transverse lingualis] consists of fibers which arise from 

 the median fibrous septum and pass lateralward to be inserted into the submucous 

 fibrous tissue at the sides of the tongue. 



