14 



TOPOGRAPHICAL ANATOMY OF THE 



cheek-tooth.^ 

 middle line. 



The fibres of the riyht and left muscles meet in the 



M. MYLOHYOIDELS. — The mylo-hyoid - muscle has a darker colour 

 than that of the foregoing, behind which it is situated. Its origin is 

 from the feeble mylo-h^^oid line on the medial surface of the mandible, 

 and its fibres meet in the middle line at a raphe that extends from the 

 mandibular symphysis to the hyoid bone. Posteriorly the mylo-hyoid 

 muscle is connected with the body, glossal process, and thyroid cornu of 

 the hyoid bone. 



Lymph glands. 



Thyroid cartilage. --V — '- 



Lig. cricothyreoideum. — V^~i 



Lig. cricotracheale.— 



1st tracheal cartilage. --V---TT7J 

 Branch of 2nd cervical ' "* ' 



M. mylohyoideus. 

 M. digastricus. 



v. maxillaris externa. 

 A. maxillaris externa. 

 Parotid duct. 



M. thyreohyoideus. 



fc/-— Submaxillary gland. 



.- M. thyreopharyngeus. 

 _. M. sternothyreoideus. 



-M. cricothyreoideus. 



-Lymph glands. 



, Parotid gland. 



M. sternothyreoideus. 



M. omohyoideus. 



M. sternohyoideus. 



Fig. 5. — Dissection of the laryngeal region. First (left) and third (riglit) stages. 



The mylo-glossal and mylo-hyoid form a muscular hammock in 

 which the tongue rests. 



N. MYLOHYOIDEUS. — The mylo-hyoid nerve is derived from the 

 mandibular — a division of the fifth cerebral nerve — and is concerned in 

 the supply of the mylo-hyoid and mylo-glossal muscles and the anterior 

 belly of the digastricus. It becomes superficial between the digastric 

 and mylo-hyoid muscles, and can be followed forwards to the symphysis 



^ The degree of development of the mylo-glossal muscle is very variable. 

 2 fxvX-r} (myle) [Gr.], a mill ; I'oetS^s (hyceides) [Gr.], U-shaped. 



