MUSCLES OF THE HEAD AND NECK 



^57 



MUSCLE 



ORIGIN 



INSERTION 



ACTION 



NERVE- 

 SUPPLY 



Thyro-hyoideus 



Thvroid cornu ' Oblique line on 

 ofhyoid outersurfaceof 



thvroid wins 



Thyro-pharyn- Thyroid cartilage 

 sjeus 



Roof of pharynx 



Acting alone, 

 elevate larynx 

 between thy- 

 roid cornu. 

 When acting 

 with sterno- 

 thyroid, thy- 

 roid cartilage 

 is steadied and 

 acts as fixed 

 point for crico- 

 thyroid and 

 thyroid- aryte- 

 noid muscles 



Recurrent nerve 



Constrictor of | Pharyngeal plexus 

 pharynx ' 



Trachelo-mas- 



toideus 



Dorsal vertebras, 

 1st and 2nd 

 transverse pro- 

 cesses. Cervi- 

 cal vertebrae, 

 last six articu- 

 lar processes 



Mastoid crest and Acting singly. Cervical and dor- 



wing of atlas 



bends neck la- 

 terally. Both 

 acting, extend 

 occipito- atlan- 

 tal articulation 

 (elevate the head) 



sal nerves 



Trapesius 



I. — Cervicnl 



Funicular part of | Scapula, tubercle ' Cervical trapesius, ' Spinal accessory 

 lig. nuchae of spine, and draws scapula 



aponeurosis on ! upwards and 

 outer scapular [ forwards 

 i muscles 



-Dorsal 



Ant. dorsal spines j Scapula, tubercle 

 or supra- of spine 

 spinous li£ 

 ments 



Dorsal trapesius Spinal accessory 

 draws scapula i 

 backwards and j 

 upwards j 



Zygomatico-auri- 

 cuiaris 



Squamous tern- ' Scutiform and 

 poral bone, zy- j conchal carti- 

 gomatic crest j lages 



To prick the ear yth nerve 



Zygomaticus 



Surface of masse- 

 ter muscle 



uccinator 

 muscle above 

 an^le of mouth 



To raise the angle yth nerve 

 of the mouth 



