THE MUSCLES OF THE HEAD. 109 
Fic. 65.—MuscLes ON THE VENTRAL SURFACE OF THE THORAX, NECK AND 
HEAD, 
The left side shows the first layer of muscles beneath the skin and skin-muscles; 
the right side shows the second layer, except in the head region. wu, M. masseter; 
6, M. digastricus; c, M. mylohyoideus; d, M. stylohyoideus; ¢, M. sternohyoideus; 
J, M., thyreohyoideus; g, M. sternomastoideus; g’, M. sternothyreoideus; 2, M. 
cleidomastoideus; z, M. levator scapulze ventralis; 7, M. clavotrapezius; 2, M. clavo- 
brachialis; 4, M. pectoralis major; 7, M. pectoantibrachialis; , part of M. scalenus; 
o, M_ pectoralis minor; 4, M. xiphihumeralis; g, M. iatissimus dorsi; 7, M. epi- 
trochlearis; s, caput longum of M. triceps brachii; 7, M. biceps brachii; ¢', bicipital 
arch; 2, M. acromiodeltoideus; v, M. brachialis. 1, parotid gland; 2, submaxillary 
gland; 3, lymphatic glands; 4, external ear; 5, external jugular vein; 6, manubrium; 
7, first rib; 8, common carotid artery; 9, molar gland. 
