Pacinian Corpuscle
Pacinian Corpuscle - Related Videos
01:20
Renal Corpuscle
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2025
The glomerulus and Bowman's capsule are two essential components of the nephron, which is the functional unit of the kidney. These microscopic structures play a critical role in the process of blood filtration to produce urine. Glomerulus: Structure and Function The glomerulus is a tiny, intricate network of capillaries located at the beginning of the nephron. It's enveloped by the Bowman's capsule and receives its blood supply from an afferent arteriole, which divides into numerous capillaries...
01:45
Kidney Structure
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2019
The kidneys are two large bean-shaped organs located in the upper abdomen. They filter the blood several times a day to remove toxins and rebalance water and electrolytes of the circulatory system via the renal veins. The kidneys receive blood directly from the heart via the renal arteries. These arteries enter the kidney at the hilum, the concave surface of the bean, where they branch and divide into smaller vessels and capillaries. The renal cortex is the thick outer layer of the kidney. It...
01:32
Filtration and Urine Formation
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2019
The function of the kidneys is to filter, reabsorb, secrete, and excrete. Every day the kidneys filter nearly 180 liters of blood, initially removing water and solutes but ultimately returning nearly all filtrates into circulation with the help of osmoregulatory hormones. This process removes wastes and toxins but is also crucial to maintain water and electrolyte levels. Most of these functions are performed by the tiny but numerous nephrons contained within the kidneys. Blood enters the renal...
07:51
Intravital Two-Photon Imaging of Touch Sensory Axon Morphology in Mouse Skin
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2025
This study presents an in vivo two-photon imaging approach for visualizing the structures of low-threshold mechanoreceptor (LTMR) axon terminals in the forepaw skin of mice. Using repeated, high-resolution imaging of individual axons, this method provides a new platform for studying the structure and function of the cutaneous sensory circuit during development and in adults.
FAQs
The concentric lamellae act as a mechanical interface between an external force and the sensory nerve ending. When pressure deforms these connective-tissue layers, the deformation reaches the nerve membrane and opens mechanically gated ion channels. Ion movement produces a receptor potential, linking tissue displacement to an electrical change that can initiate neural signaling.
Rapid adaptation means the receptor's response is tied especially to changing mechanical input rather than simply maintaining activity during continuous pressure. This property helps Pacinian corpuscles signal vibration and other rapid mechanical changes while reducing emphasis on an unchanging force. It explains why they are suited to movement-related touch and grip adjustments.
A receptor potential is the graded electrical response produced at the nerve membrane after mechanically gated channels respond to deformation. If depolarization becomes sufficient, it triggers action potentials, which provide the propagated neural signal. Distinguishing these stages clarifies how a local mechanical event is converted into information the nervous system can use.
A useful analysis follows three linked stages: identify mechanical deformation of the lamellae, examine mechanically gated ion-channel activity and the resulting receptor potential, and determine whether depolarization reaches the level needed for action potentials. This sequence organizes investigation from stimulus, to transduction, to neural output without treating pressure detection as a single step.
Pacinian corpuscles occur mainly in deep skin, subcutaneous tissue, joints, and other connective tissues. Their distribution places them where mechanical forces associated with pressure, vibration, grip, and movement can influence sensory nerve endings. Considering location helps relate a corpuscle's response to the type of mechanical change occurring in the surrounding body tissue.
They provide a compact biological model for studying sensory transduction because their organization connects a defined mechanical structure, a sensory membrane, ion-channel gating, receptor potentials, and action potentials. Studying this chain also supports broader analysis of somatosensory physiology, showing how physical changes in tissue become signals that contribute to touch and movement-related perception.