76 ANATOMY. 



Aryteno-epiglottideus Superior, from the apex of the arytenoid cartilage, 



into the aryteno-epiglottidean folds. Action, to constrict the superior laryn- 



geal aperture. Nerve, recurrent laryngeal. 

 Aryteno-epiglottideus Inferior, from the arytenoid cartilage anteriorly, inlt 



the sacculus laryngis and the margin of the epiglottis. Action, to compress 



the sacculus laryngis. Nerve, recurrent laryngeal. 



MUSCLES OF THE BACK. 

 First layer (2) Trapezius. Latissimus Dorsi. 



Second layer (3) Levator Anguli Scapulas. Rhomboideus Major and Minor, 

 Third layer (3) Serratus Posti'cus Superior. Serratus Posti'c^^s Inferior. 



Splenius Capitis et Colli. 

 Fourth layer (n) in 4 sets, viz. 



LUMBAR (i) Erector Spina. 



EXTERNAL (3). MIDDLE (3). INTERNAL (4). 



Sacro lumbalis. Longissimus Dorsi. Spinalis Dorsi. 



Musculus Accessorius Transversalis Colli. Spinalis Colli. 



ad Sacro-lumbalem. Trachelo-mastoid. Biventer Cervicis. 



Cervicalis Ascendens. Complcxus. 



Fifth layer (12) 6 having the word spinal in them, viz. 

 Semi-spinalis Dorsi. Inter-transversales. 



Semi-spinalis Colli. Rectus Capitis Posti'cus Major. 



Multifidus Spince. Rectus Capitis Posti f cus Minor. 



Rotatores Spince. Obliquus Capitis Sztpcrior. 



Supra-spinales. Obliquus Capitis Inferior. 



Inter-spinales. Extensor Coccygis. 



Frapezius, 1 from the inner third of the superior curved line of the occipital 

 bone, the ligamentum nuchae, 2 the spinous processes of the last cervical and 

 all the dorsal vertebrae, and the supra-spinous ligament, into the outer third 

 of the posterior border of the clavicle, the superior margin of the acromior; 

 process, the whole length of the superior border of the spine of the scapula, 3 

 and a tubercle at its inner extremity. Action, to draw the head backwards. 

 Nerves, spinal accessory, cervical plexus. 

 LIGAMENTUM *NvcuM,from the external occipital protuberance, to the spines 



of the cervical vertebrae, from the 2d to the 7th inclusive. 

 Latissimus Dorsi, 4 by an aponeurosis from the spines of the 6 lower dorsal 

 and the lumbar and sacral vertebrae, the supra-spinous ligament, the crest 

 of the ilium, and the 3 or 4 lower ribs, into the bicipital groove of the 

 humerus. Action, the cursor ani muscle, drawing the arm downward? 

 and backwards; or raising the lower ribs and drawing the trunk forwards 

 Nerves, the subscapular. 



