222 LABORATORY MANUAL OF HUMAN ANATOMY 



Lymph-glands. (Vide Fig. 93.) 



(a) Superior deep cervical lymph-glands (lymphoglandulae cervicales 



profundae superiores). 

 Viscera. 



(a) Larynx. 



(b) Pharynx. 



(c) Carotid skein (glomus caroticum) (0. T. intercarotid gland). 



Observe that some of the structures above enumerated become 

 visible only after the parts have been loosened by dissection, 

 that the greater cornu of the os hyoideum is in this space, and 

 that, while the N. hypoglossus runs transversely in the spaces, 

 the N. vagus and truncus sympathicus run vertically and the 

 other large nerves obliquely. 



Muscular Triangle. 



Why is it so called ? Find and study the following structures : 



Muscles. 



(a) Sternohyoid (M. sternohyoideus). 



(b) Sternothyreoid (M. sternothyreoideus) . 



Arteries. 



(a) Superior thyreoid artery (A. thyreoidea superior). 



Nerves. 



(a) Muscular rami to M. sternohyoideus and M. sternothyreoideus 



(from the ramus descendens N. hypoglossi). 



(b) External ramus of superior laryngeal nerve (ramus externus N. 



laryng. sup.). 



(c) Recurrent laryngeal nerve (N. recurrens N. vagi). 



Viscera. 



(a) Larynx. 



(b) Trachea. 



(c) Thyreoid gland (glandula thyreoidea). 



(d) Oesophagus (on left side). 



Structures in the Anterior Median Line of the Neck and near it. 

 (See Fig. 92, p. 221.) 



These should now be successively examined and studied. 



Suprahyoid Region. 



(a) Platysma. 



(b) Fascia superficial. (Note double chin.) 



(c) Space between anterior bellies of Mm. digastrici of two sides. 



(d) Mylohyoid muscles (Mm. mylohyoidei) and raphe between them. 

 Infrahyoid Region. 



(a) Hyothyreoid membrane (membrana hyothyreoidea) (0. T. thyro- 



hyoid membrane). 



(b) Thyreoid cartilage (cartilago thyreoidea}. 



