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ANATOMY. 



Between the sternal and 

 clavicular origins is a 

 fossa, the fonticulus 

 giitturis, which rises 

 and falls during la- 

 bored breathing. 

 Sterno-hyoid, 14 from 

 the posterior surface 

 of the sternum and 

 the sternal end of the 

 clavicle, into the 

 body of the hyoid 

 bone. Action, to de- 

 press the hyoid bone. 

 Nerve, a branch from 

 the communicating 

 loop between the de- 

 scend ens and com- 

 municans noni. 



Sterno-thyroid, 15 yh?w the posterior surface of the sternum and the cartilage 

 of the ist rib, into the oblique line on the ala of the thyroid cartilage. 

 Action, to depress the larynx. Nerve, a branch from the communicating 

 loop between the descendens and communicans noni. 



Thyro-hyoid, 16 from the oblique line on the thyroid cartilage, into the 

 body and greater cornu of the hyoid bone. Action, to elevate the larynx. 

 Nerve, hypoglossal. 



Omo-hyoid, 17 18 from the upper border of the scapula and the transverse 

 ligament, into the body of the hyoid bone. It has a tendon in its centre 

 which is bound down to the cartilage of the 1st rib by a loop of the deep 

 cervical fascia. Action, to depress the hyoid bone, and draw it backwards. 

 Nerve, branch from the communicating loop between the descendens and 

 communicans noni. 



Digastric, by 2. bellies, the posterior one 1 from the digastric groove of the 

 mastoid process of the temporal bone; the anterior* from a fossa on the 

 inner surface of the inferior maxillary, near its symphysis, into a central 

 tendon 3 which perforates the stylo-hyoid muscle, and is bound down to the 

 body of the hyoid bone by an aponeurotic loop. Action, to raise the hyoid 

 bone and tongue. Nerves, facial, and mylo-hyoid branch of the inferior dental. 

 Stylo-hyoid, 4 from the styloid process of the temporal bone near its base, 

 into the body of the hyoid bone. Action, to elevate and retract the hyoid 

 bone. Nerve, facial. This muscle is perforated by the digastric. 



