224 



LABORATORY MANUAL OF HUMAN ANATOMY 



(c) Elastic cone and middle cricothyreoid ligament (conus elasticus, 



ligamentum cricothyreoideum [medium}} (0. T. cricothyroid 

 membrane). Upon it lies the ramus cricothyreoideus of the A. 

 thyreoidea superior. 



(d) Cricoid cartilage (cartilago cricoidea). 



(e) Cricothyreoid muscles (Mm. cricothyreoideae) . 

 (/) Trachea. 



FIG. 94. 



M. sternocleidomastoideus. 

 M. omohyoidcus 



M. scalenus medius 

 ...M. thyreohyoideus 



M. trapezoideus 

 M. scalenus posterior 



M. omchyoideus 



M. scalenus 



medius 



...M. sternothy- 

 reoideus 



- -M. scalenus 

 posterior 



C 



Muscles of the neck. (From Poirier et Charpy, Traite" d'Anat. hum., Paris, 1901, 2 ed., t. ii. 



p. 395, Fig. 249. ) 



(g) Isthmus of thyreoid gland (isthmus glandulae thyreoideae] . 



(h) Pyramidal lobe of thyreoid gland (lobus pyramidalis [Gl. thy- 



reoideae]). 



(i) Inferior thyreoid veins (Vv. thyreoideae inferiores). 

 (j) Innominate artery (A. anonyma). 



(ja) Lowest thyreoid artery (A. thyreoidea ima). 

 (k) Left innominate vein (V. anonyma sinistra). 

 (I) Thymus. 



Surgical Anatomical Points. 



In the operation of laryngotomy the ligamentum cricothyreoideum is 

 cut through transversely in its lower part, inferior to the ramus crico- 

 thyreoideus of the A. thyreoideus superior. 



