_1_, Cerebral hemisphere; _2_, lateral ventricle; _3_, thalamus; _4_,
corpora quadrigemina; _5_, optic chiasma; _6_, pituitary body; _7_,
pons; _8_, medulla oblongata; _9_, cerebellum; _10_, spinal cord;
_11_, ventral straight muscles; _12_, pharyngeal lymph gland; _13_,
arytenoid cartilage; _14_, epiglottis; _15_, cricoid cartilage;
_16_, vocal cord; _17_, palatine sinus; _18_, soft palate; _19_,
Eustachian opening; _C_{1}_, _C_{2}_, _C_{3}_, first, second, and
third cervical vertebræ; _B.o._, basioccipital; _Sp._, presphenoid.
]