80 A MANUAL OF ANATOMY. 



Action. The hyoid bone being fixed, slightly to raise 

 and draw forward the scapula, to tense the fascia of the 

 neck below. The scapula being fixed, to depress (and 

 retract) the hyoid bone. 



Sternohyoid. Figs. 16, 17. 



Origin. From the inner surface of the first piece of the 

 sternum, the posterior sternoclavicular ligament, and adja- 

 cent portion of the clavicle. 



Insertion. Into the lower border of the body of the 

 hyoid bone. 



Nerve Supply. By filaments from the descendens and 

 communicans hypoglossi. 



Action. To depress and fix the hyoid bone. 



Sternothyroid. Fig. 17. 



Origin. From the inner surface of the manubrium below 

 and internal to the Sternohyoid, from the cartilage of the 

 first rib. 



Insertion. Into the oblique line on the outer surface of 

 the thyroid cartilage. 



Nerve Supply. Same as for the Sternohyoid. 



Action. To depress the thyroid cartilage and the hyoid 

 bone above. 



Thyrohyoid. Figs. 17 and 18. 



Origin. From the oblique line on the outer surface of 

 the thyroid cartilage. 



Insertion. Into the lower border of the body and greater 

 cornu of the hyoid bone. 



Nerve Supply. A small branch directly from the hypo- 

 glossal nerve. 



Action. To approximate the hyoid bone and thyroid 

 cartilage, depressing the one or elevating the other accord- 

 ing to its fixed point. 



