16. Part of posterior scalenus muscle.

[Illustration: Head and neck, in section, from front to back; showing blood vessels, muscles and other internal organs.] Plate 20 PLATE 21. A. Zygoma. B. Articular glenoid fossa of temporal bone. C. External pterygoid process lying on the levator and tensor palati muscles. D. Superior constrictor of pharynx. E. Transverse process of the Atlas. F. Internal carotid artery. Above the point F, is seen the glosso-pharyngeal nerve; below F, is seen the hypoglossal nerve. G. Middle constrictor of pharynx. H. Internal jugular vein. I. Common carotid cut across. K. Rectus capitis major muscle. L. Inferior constrictor of pharynx. M. Levator anguli scapulae muscle. N. Posterior scalenus muscle. O. Anterior scalenus muscle. P. Brachial plexus of nerves. Q. Trachea. R R*. Subclavian artery. S. End of internal jugular vein. T. Bracheo-cephalic artery. U U*. Roots of common carotid arteries. V. Thyroid body. W. Thyroid cartilage. X. Hyoid bone. Y. Hyo-glossus muscle. Z. Upper maxillary bone.