THE PLEURA 527 
Dorso-scapular ligament Ligamentum nuche 
Trapezius 
Rkomboideus 
Spinalis 
Complexus 
Longissimus dorst 
Multifidus 
Serratus ventralis 
Longissimus 
costarum 
Lev1ator coste 
Subscapularis 
Infraspinatus 
Cutaneus 
Teres major 
Deltoideus 
Triceps 
(c. longum) 
Triceps 
(c. laterale) 
Coraco-brachialis 
Brachialis 
Pecioralis prof. 
(p. humeralis 
Extensor carpi 
radialis 
Biceps brachii 
Pectoralis profundus Pectoralis superficialis 
(p. scapularis) (p. transversa) 
Fic. 469.—Srction or THorRAx oF Horse. 
The section is cut in an oblique direction corresponding with the spine of the scapula. It passes through the fourth 
thoracic vertebra and a little more than an inch behind the shoulder joint. The pleural cavities, indicated by wide 
black lines, are exaggerated for the sake of clearness. 
1, Pleural cavities (number is placed in mediastinum); 2, 2’, lungs; 3, esophagus; 4, trachea; 5, brachiocephalic 
trunk; 6, anterior vena cava; 7, thoracie duct; S, 8’, vagi; 9, left recurrent nerve; 10, 10’, phrenic nerves; 11, internal 
thoracic vessels; 12, sympathetic trunk; 13, subcostal vesse 14, external thoracic vessels; 15, brachial vein; 16, 
brachial artery; 17, radial nerve; 18, ulnar nerve; 19, musculo-cutaneous nerve; 20, median nerve; 21, subscapular 
vessels; a, m. longus colli; b, m. rectus thoracis; c, m. transversus thoracis; d, m. intercostalis internus; S, sternum; 
H, humerus. Ventral to the trachea there are shown, but not marked on account of lack of space, two cardiac nerves 
and a mediastinal lymph gland. 
