[8] Duchenne believes that in the eversion of the lower lip,
the corners are drawn downwards by the _depressores anguli oris_.
Henle (Handbuch d. Anat. des Menschen, 1858, B. i. s. 151) concludes that
this is effected by the _musculus quadratus menti_.
As the sense of smell is so intimately connected with that of taste,
it is not surprising that an excessively bad odour should excite retching
or vomiting in some persons, quite as readily as the thought of revolting
food does; and that, as a further consequence, a moderately offensive
odour should cause the various expressive movements of disgust.
The tendency to retch from a fetid odour is immediately strengthened
in a curious manner by some degree of habit, though soon lost by longer
familiarity with the cause of offence and by voluntary restraint.
For instance, I wished to clean the skeleton of a bird, which had not
been sufficiently macerated, and the smell made my servant and myself
(we not having had much experience in such work) retch so violently,
that we were compelled to desist. During the previous days I had
examined some other skeletons, which smelt slightly; yet the odour
did not in the least affect me, but, subsequently for several days,
whenever I handled these same skeletons, they made me retch.
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