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Section of skin showing two papillae of the dermis and some of the deeper cells of the epidermis, involved in sensation of the skin. Labels: a, papilla containing blood vessels; b, papilla containing a tactile corpuscle, t; d, medullated nerve fibers going to the corpuscle; at f, optical cross-sections of the fibers are seen as they wind round the outside of the corpuscle; the general transverse direction of the connective tissue bundles of the capsule of the corpuscle is shown.

Sensation of the Skin

Section of skin showing two papillae of the dermis and some of the deeper cells of the epidermis, involved…

Illustrating the functions of the spinal nerves. Divided at a. -- Irritated at 1: pain. Irritated at 2: muscular contraction. Nerve trunks transmit stimuli which give rise to sensation, as, for example, sensations of pain (sensory stimuli).

Spinal Nerves

Illustrating the functions of the spinal nerves. Divided at a. -- Irritated at 1: pain. Irritated at…

Illustrating the functions of the roots of the spinal nerves. Labels: a, ventral root; p, dorsal root. Divided at a. -- Irritated at 1: no result. Irritated at 2: contraction of muscles supplied with fibers from the root. Divided at p. -- Irritated at 3: no result. Irritated at 4: pain produced.

Roots of Spinal Nerves

Illustrating the functions of the roots of the spinal nerves. Labels: a, ventral root; p, dorsal root.…