452 
Dr Duckworth, Description of a 
A median longitudinal incision was then made, dividing the 
remains of the cranium, and splitting the neck into two equal 
halves. The appearance of the cut surface of the left half is 
reproduced (from a photograph) in Plate xv, Fig. 4, and in Fig. 18 
I have sketched some of the main features in a semi-diagrammatic 
way. 
The base of the skull can be recognised (Plate xv, Fig. 4, and 
Fig. 18) and the hucco-pharyngeal membrane is seen in section. 
The pharyngeal part of the tongue is seen beneath this, and the 
epiglottis is large and distinct. In the retro-oral division of the 
pharynx, the lateral wall is marked by two grooves, which appear 
to correspond in position to the orifice of the Eustachian tube and 
to the lateral recess. Superiorly, a pharyngeal diverticulum 
ascended to the cranial base and represented the pouch of Seessel. 
The oesophagus, larynx, trachea called for no special description. 
The vocal cords can be seen. A large portion of the bucco- 
pharyngeal membrane attached to the root of the tongue with the 
epiglottis was then removed and examined microscopically. Fig. 19 
represents the appearance of one of the sections under a low 
power. 
The lining epithelium throughout is of the stratified squamous 
type. Similar epithelium lines the oesophagus and supplies a 
conclusive proof (if such is needed) that such epithelium may 
arise from endodermal tissue. The substance of the bucco- 
pharyngeal membrane contains much connective tissue with 
small glands and bundles of muscle-fibres, and this is of interest, 
Vocal 1 
Chords I 
j 'Epiglottis. 
Thyroid Cartilage 
Fig. 18. 
