MUSCLES 31 



Crico-arytenoideus lateralis: side of superior border of 

 cricoid cartilage(F) projection at external angle of base of 

 arytenoid cartilage, and contiguous external surface(p) (Re- 

 current laryngeal j. [Adducts cords.] 



Cricp - arytenoideus posticus : depression near ridge on 

 posterior surface of cricoid cartilage(p) projection at external 

 angle of base of arytenoid cartilage(p) (Recurrent laryngeal). 

 [Abducts cords.] 



Arytenoideus : single muscle in the median line, fills up 

 posterior concave surface of arytenoid cartilages. Superficial 

 fibres pass from apex of one cartilage to base of other. Deep 

 fibres pass between posterior surfaces of the cartilages (Re- 

 current laryngeal). [Approximates cords.] 



ANTERIOR VERTEBRAL REGION. 



Rectus capitis anticus major: four tendinous slips from 

 anterior tubercles of transverse processes of 6th, 5th, 4th, 3rd 

 cervical vertebrae(T) basilar process of occipital(p) (ist, 2nd. 

 3rd and 4th cervical). [Flexes head and cervical spine.] 



Rectus capitis anticu?j minor: root of transverse process 

 and lateral mass of atlas(p) basilar process of occipital(p) 

 (ist cervical). [Flexes head.] 



Rectus lateralis : superior surface of transverse process of 

 atlas(F) jugular process of occipital(p) (ist cervical). [Flexes 

 head to same side.] Highest intertransverse muscle. 



Longus colli : Superior oblique part. Anterior tubercles of 

 transverse processes of 3rd, 4th, 5th cervical vertebrae(T) 

 tubercle on anterior arch of atlas(T). Inferior oblique part. 

 Bodies of first three dorsal(p) anterior tubercles of trans- 

 verse processes of 5th and 6th cervical(T). Vertical part. 

 Bodies of lower two cervical and upper three dorsal and 

 itranverse processes of 4th, 5th, 6th, 7th cervical vertebrae(FT) 

 bodies of and, 3rd and 4th cervical vertebrae(T) (Cervical 

 nerves). [Flexes cervical spine.] 



LATERAL VERTEBRAL REGION. 



Scalenus anticus : anterior tubercles of transverse pro- 

 cesses of 3rd, 4th, 5th, 6th cervical vertebrae(T) scalene 

 tubercle on inner border and superior surface of ist rib(T) 

 (Branches of lower cervical) . [A raises ribs as in forced inspira- 

 tion, B flexes spine and bends neck to same side.] Phrenic nerve 

 lies along anterior surface; subclavian artery passes behind at origin. 



Scalenus medius : posterior tubercles of transverse pro- 

 cesses of lower six cervical vertebrae(T) rough elevation on 



