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Touch corpuscles are found in the papillae of the skin of the fingers and toes, or among its epithelium; they may be simple or compound; when simple, they are large and slightly flattened transparent nucleated ganglion cells, enclosed in a capsule; when compound the capsule contains several smalls cells. Shown are the papillae from the skin of the hand, freed from the cuticle and exhibiting tactile corpuscles. A. Simple papilla with four nerve fibers; a, tactile corpuscles; b, nerves with cells and fine elastic filaments; b, tactile corpuscle with transverse nuclei; c, entering nerve with neurilemma or perineurium; d and e, nerve fibers winding round the corpuscle.

Touch Corpuscles

Touch corpuscles are found in the papillae of the skin of the fingers and toes, or among its epithelium;…

Section of skin showing two papillae and deeper layers of epidermis. The papillae contain blood vessels as well as the termination of nerve fibers in the shape of little bodies called tactile corpuscles. The papillae seem chiefly to exist for the purpose of giving the skin its sense of touch. Labels: a, vascular papilla, with capillary loop passing from subjacent vessel, c; b, nerve-papilla, containing tactile corpuscle, t; d, nerve passing up to tactile body; f, f, section of spirally winding nerve fibers.

Section of Epidermis (Skin)

Section of skin showing two papillae and deeper layers of epidermis. The papillae contain blood vessels…

"<em>A</em>, pyramids of the kidney; <em>B</em>, apices, or papillae, of the pyramids; <em>C</em>, pelvis of the kidney; <em>D</em>, upper end of the ureter</em>." &mdash; Blaisedell, 1904

Kidney

"A, pyramids of the kidney; B, apices, or papillae, of the pyramids; C, pelvis…

"Surface of Palm of the Hand, showing Openings of Sweat Glands and Grooves between Papillae of the Skin. In the smaller figure the same epidermal surface is shown as seen with the naked eye." &mdash; Blaisedell, 1904

Surface of the palm

"Surface of Palm of the Hand, showing Openings of Sweat Glands and Grooves between Papillae of the Skin.…

The upper illustrations show conical and fungiform papillae, the lower a circumvallate papilla. Labels: C, corium; E, epithelium of the mucous membrane. The wavy dark line represents arteries.

Papillae of the Tongue

The upper illustrations show conical and fungiform papillae, the lower a circumvallate papilla. Labels:…

Papillae from the palm of the hand, with the epidermis removed. Magnified.

Papillae with Epidermis Removed

Papillae from the palm of the hand, with the epidermis removed. Magnified.

"Dissection of Peripatus. at., Antennae; or.p., oral papillae; c.g., cerebral ganglia; sl.d., duct of slime gland (sl.g.); s.o.8, eighth segmental organ or nephridium; v.c., ventral nerve connected by transverse commissures (co.) with its fellow; s.o.17, seventeenth nephridium; g.o., genital aperture; A., anus; p.d.c., posterior commissure; F.17, seventeenth appendage; a.g., last crural gland--that of the opposite side is marked v.g.; F.1, F.2 first and second legs; oe.co., osophageal nerve commisure; oe., oesophagus; ph., pharynx--the remainder of he gut is removed." -Thomson, 1916

Peripatus Dissection

"Dissection of Peripatus. at., Antennae; or.p., oral papillae; c.g., cerebral ganglia; sl.d., duct of…

The sense of smell is closely allied with the sense of taste. The organs of the sense of smell are simple nerve-endings in papillae or pits. The substance to be smelled must come to the organs of smell as a gas or vapor. This example shows the smelling pits on the expanded terminal segments on the antenna of a leaf-eating beetle.

Sense of Smell

The sense of smell is closely allied with the sense of taste. The organs of the sense of smell are simple…

<em>A</em>, epiglottis; <em>B</em>, glands at the base of tongue; <em>C</em>, tonsil; The various kinds of papillae are plainly shown." &mdash; Blaisedell, 1904

Tongue

A, epiglottis; B, glands at the base of tongue; C, tonsil; The various kinds…

The upper surface of the tongue. Labels: 1,2, circumvallate papillae; 3, fungiform papillae; 4, filiform papillae; 6, mucous glands.

Tongue

The upper surface of the tongue. Labels: 1,2, circumvallate papillae; 3, fungiform papillae; 4, filiform…

The tongue showing three kinds of papillae- the conical (D), the whiplike (K, I), the circumvallate or entrenched (H, L); E, F, G, nerves; C, glottis.

The Tongue Showing Three Kinds of Papillae

The tongue showing three kinds of papillae- the conical (D), the whiplike (K, I), the circumvallate…

The tongue, showing the papillae.

The Tongue

The tongue, showing the papillae.

The upper surface of the tongue with part of the pillars of the fauces and the tonsils. Labels: 1, 2, circumvallate papillae; 3, fungiform papillae; 4, filiform papillae; 6, mucous glands; 7, tonsils; 8, tip of epiglottis.

Upper Surface of the Tongue

The upper surface of the tongue with part of the pillars of the fauces and the tonsils. Labels: 1, 2,…