Further observations on the gustatory organs of the Mammalia / Frederick Tuckerman.

  • Tuckerman, Frederick, 1857-
Date:
1892
Catalogue details

Licence: Public Domain Mark

Credit: Further observations on the gustatory organs of the Mammalia / Frederick Tuckerman. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    the other hand, lie more obliquely, present a less regular con- tour, and are somewhat depressed at the centre. Within the space bounded by the four gustatory papillae are three transi- tional forms, which are obviously modifications of the fungiform type. The dorsum posterior to the gustatory region is wrinkled, but devoid of papillae. The lateral gustatory organs are placed obliquely at the sides of the base, very much as in Lepus. The fringe of filiform papillae is wanting. The tongue of A teles possesses a fraenal process very similar to that already described in Cehis. It measures 6.5 mm. in length, and its greatest width is 4.5 mm. The tip is forked, and the edge more or less fimbriated. GUSTATORY STRUCTURES. The Circumvallate PapillcB. — The papillae vary greatly in size and are occasionally lobate. The summits of the anterior pair do not project from the openings of the trenches, and hence they are more protected than the posterior pair. They measure from 0.70 mm. to 2.30 mm, transversely, and are 0.75 mm, in height. Serous glands are fairly abundant and occur within the papillae. The ducts open at the usual places. The bulbs are disposed on the lateral area of the papillae in ten tiers. A few scattered bulbs are also present on the free upper surface and, more rarely, may be found embedded in the epithe- lium of the outer wall of the trench. The bulbs are closely set, and, in crowded tiers, number one hundred and forty. The mean is probably one hundred. They measure 0.051 mm. in length and 0.027 mm. in breadth. The Lateral Gustatoiy Organs. — The organs are flattened or slightly rounded on top, and measure 8 mm. in length and 4.5 mm. in breadth. The folds are fairly uniform in size, and twelve of the fifteen bear bulbs. The furrows are narrow, and measure 0.65 mm. in depth. Serous glands are fairly plentiful and occur within the folds. The ducts open into the furrows at their deeper part. The bulbs, of which there are some ten tiers, measure 0.051 mm. in length and 0.027 mm. in breadth. The fungiform papillae are of normal structure. Those about the tip, more especially its under part, are richly supplied with bulbs. Here they are numerous but small, and in some papillje
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