corpuscle

Examples of corpuscle in the following topics:

• Tactile Sensation

  • Meissner's corpuscles detect changes in texture (vibrations around 50 Hz) and adapt rapidly.
  • The Ruffini ending (Ruffini corpuscle or bulbous corpuscle) is a class of slowly adapting mechanoreceptors thought to exist only in the glabrous dermis and subcutaneous tissue of humans.
  • Meissner's corpuscles (or tactile corpuscles) are responsible for sensitivity to light touch.
  • Pacinian corpuscles (or lamellar corpuscles) are responsible for sensitivity to vibration and pressure.

• Somatosensory Receptors

  • Meissner's corpuscles, also known as tactile corpuscles, are found in the upper dermis, but they project into the epidermis .
  • Pacinian corpuscles, located deep in the dermis of both glabrous and hairy skin, are structurally similar to Meissner's corpuscles.
  • There are fewer Pacinian corpuscles and Ruffini endings in skin than there are Merkel's disks and Meissner's corpuscles.
  • Meissner's corpuscles, Ruffini endings, Pacinian corpuscles, and Krause end bulbs are all encapsulated.
  • Meissner's corpuscles respond to touch and low-frequency vibration.

• Sensory Adaptation

  • This follows the model of sensory adaptation presented by Georg Meissner, which is known as "Meissner's corpuscles."
  • Meissner's corpuscles are sensory triggers of physical sensations on the skin, especially areas of the skin that are sensitive to light and touch.
  • These corpuscles rapidly change and adapt when a stimulus is added.
  • When the stimulus is removed, the corpuscles regain their sensitivity.

• The Thomson Model

  • In Thomson's model, the atom is composed of electrons (which Thomson still called "corpuscles," though G.
  • Now, at least part of the atom was to be composed of Thomson's particulate negative corpuscles, although the rest of the positively charged part of the atom remained somewhat nebulous and ill-defined.
  • A schematic presentation of the plum pudding model of the atom; in Thomson's mathematical model the "corpuscles" (in modern language, electrons) were arranged non-randomly, in rotating rings.

• Nephron: The Functional Unit of the Kidney

  • A nephron consists of three parts: a renal corpuscle, a renal tubule, and the associated capillary network, which originates from the cortical radiate arteries.
  • The renal corpuscle, located in the renal cortex, is composed of a network of capillaries known as the glomerulus, as well as a cup-shaped chamber that surrounds it: the glomerular or Bowman's capsule.

• Cutaneous Sensation

  • The Meissner corpuscle is a stack of flattened cells located in the dermis, near the epidermis.
  • The Pacinian corpuscle is a layered, onion-like capsule surrounding a nerve fiber.

• Integration of Signals from Mechanoreceptors

  • Small, finely-calibrated mechanoreceptors (Merkel's disks and Meissner's corpuscles) are located in the upper layers and can precisely localize even gentle touch.
  • The large mechanoreceptors (Pacinian corpuscles and Ruffini endings) are located in the lower layers and respond to deeper touch.

• Somatosensation: Pressure, Temperature, and Pain

  • Examples of free receptors are the hair receptors at the roots of hairs, while encapsulated receptors are the Pacinian corpuscles and the receptors in the glabrous (hairless) skin: Meissner's corpuscles, Ruffini's corpuscles, and Merkel's discs.

• Bulk Flow: Filtration and Reabsorption

  • Each nephron begins in a renal corpuscle composed of a glomerulus containing numerous capillaries enclosed in a Bowman's capsule.

• Thermoreception

  • They are also found in the penis and the clitoris; hence, the name of genital corpuscles.
  • Ruffini corpuscles respond to sustained pressure and show very little adaptation.