corpusculos

Corpuscles, from the Latin corpusculum meaning “little body,” is a general term in anatomy and histology used for small, discrete structures. The word has multiple applications, including sensory receptors in the skin, various blood-related structures in older medical usage, and the functional units within organs such as the kidney.

In sensory physiology, corpuscular receptors are specialized nerve endings that detect mechanical or thermal stimuli. Pacinian corpuscles are large, onion-like lamellated structures located deep in the dermis and hypodermis; they respond to deep pressure and high-frequency vibration. Meissner’s corpuscles are smaller, situated in the dermal papillae of hairless skin, and mediate light touch. Merkel discs are slow-adapting receptors found at the dermal-epidermal junction, detecting sustained pressure and texture. Ruffini endings lie in the dermis and sense skin stretch. Krause end bulbs function as thermoreceptors in certain mucous membranes and skin regions.

In hematology, the term corpuscle historically referred to blood cells, with red corpuscles (erythrocytes) and white corpuscles (leukocytes). Today, these are the standard terms, although “corpuscles” can appear in older texts.

Renal corpuscles are a distinct usage in renal anatomy. Each renal corpuscle comprises a glomerulus—a tuft of capillaries—enclosed by Bowman's capsule. They constitute the filtration unit of the nephron, initiating urine formation by filtering blood plasma.

Overall, corpuscles denote small, discrete entities across biology, ranging from sensory receptors in the skin to cellular components of blood and microscopic structures within organs.