R. Superior cervical ganglion of sympathetic nerve.
S. Vagus nerve lying external to sympathetic nerve, and giving off t its laryngeal branch.
T. Superior thyroid artery.
U. Lingual artery separated by hyo-glossus muscle from
V. Lingual or ninth cerebral nerve.
W. Sublingual salivary gland.
X. Genio-hyoid muscle.
Y. Mylo-hyoid muscle, cut and turned aside.
Z. Thyroid cartilage.
1. Upper part of sterno-hyoid muscle.