The rhomboideus muscle. 4, The external oblique
muscle.

_Muscles of the Upper Extremities._ 5, The deltoid muscle. 6, 7, The
infra-spinatus muscle. 9, The triceps extensor muscle. 10, The
internal brachial muscle. 11, The long supinator muscle. 12, The
external radial muscle. 13, The second external radial muscle. 14, The
anconeus muscle. 15, 16, The extensor digitorum communis muscle. 17,
The extensor carpi ulnaris muscle. 18, The flexor carpi ulnaris. 19,
20, The extensor ossis metacarpi pollicis muscles. 21, An extensor
muscle of the thumb. 22, 28, Interossii muscles.

_Muscles of the Lower Extremities._ 29, The gluteus maximus muscle.
30, The gluteus medius muscle. 31, The biceps flexor cruris muscle.
32, The semi-tendinosus muscle. 33, The semi-membranosis muscle. 34,
The gracilis muscle. 35, The adductor muscle. 36, The vastus externus
muscle. 37, The sartorius muscle. 38, 39, The gastrocnemii muscles.
40, The long peroneal muscle. 41, The external peroneal muscle. 42,
The long flexor muscle of the great toe. 43, The long extensor muscle
of the toes. 44, The short extensor muscle of the toes. 47, The short
flexor muscle of the toes.

The figures and letters on the left side of the plate, indicate the
position of membranous fasciae which envelop the muscles and tendons.

PLATE V.

ORGANS OF THE THORAX AND ABDOMEN.

Fig. 1. _The Mouth and Neck._ (A Side view.) 1, The upper lip. 2, The
lower lip. 3, The upper jaw. 4, The lower jaw. 5, The tongue. 6, The
hard palate, (roof of the mouth.) 7, The parotid gland. 8, The
sublingual gland. T, The larynx. 10, The pharynx. 11, The oesophagus.
12, The upper portion of the spinal column. C, The spinal cord.

_The Chest and its Organs._ 9, 9, The trachea. R, The right auricle of
the heart. L, The left auricle. 13, The left ventricle of the heart.
14, The right ventricle. 15, The aorta. 16, The pulmonary artery. 17,
The vena cava descendens. 18, The right subclavian vein. 19, The left
subclavian vein. 20, The right jugular vein. 21, The left jugular
vein. 22, The right carotid artery. 23, The left carotid artery. 24,
25, 26, The upper, middle, and lower lobes of the right lung. 27, 28,
The upper and lower lobes of the left lung. 29, 29, 29, The diaphragm.
P, P, P, P, The pleura, that lines the cavity of the chest. S, S, The
clavicles. O, O, O, O, The ribs. M, M, M, M, Muscles of the chest. 40,
The thoracic duct, opening into the left subclavian vein.

_The Abdomen an