Video Experimental Relacionado
Updated: Aug 14, 2026

11:10
Membrane Potential Dye Imaging of Ventromedial Hypothalamus Neurons From Adult Mice to Study Glucose Sensing
Published on: November 27, 2013
Las neuronas supraópticas del hipotálamo de la rata son osmosensitivas
Nature
|September 11, 1980
Resumen
Las neuronas del núcleo supraóptico (SON) en el hipotálamo detectan cambios osmóticos. Estas neuronas perciben directamente los estímulos osmóticos y forman parte de un complejo osmoreceptivo cerebral más grande.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Fisiología Fisiología Fisiología.
- Biología celular Biología celular.
Sus antecedentes:
- El núcleo supraóptico (SON) en el hipotálamo juega un papel crucial en la regulación de la homeostasis de los fluidos corporales.
- Comprender los mecanismos celulares de la osmorecepción es vital para comprender el equilibrio fisiológico de los fluidos.
Objetivo del estudio:
- Investigar los mecanismos celulares que subyacen a la sensibilidad osmótica en las neuronas del núcleo supraóptico (SON).
- Para determinar cómo las neuronas SON responden a los cambios en la osmolaridad extracelular.
Principales métodos:
- Utilizó una preparación de corte cerebral hipotalámico in vitro.
- Realizó grabaciones intracelulares de las neuronas SON.
- Se aplican estímulos osmóticos (NaCl, mannitol, glucosa) al entorno extracelular.
Principales resultados:
- Las neuronas SON exhiben tasas de disparo aumentadas en respuesta a pequeños aumentos en la osmolaridad (940 mosmol l-1).
- Se observó una respuesta neuronal con NaCl y manitol, pero no con glucosa.
- La sensibilidad osmótica implica tanto la despolarización directa de las neuronas SON como el aumento de los eventos sinápticos excitatorios.
Conclusiones:
- Las neuronas SON son directamente osmosensitivas y contribuyen a la osmorecepción en el cerebro de los mamíferos.
- Los hallazgos apoyan la localización de la osmorecepción en el hipotálamo anterior, específicamente dentro del SON.
- Las neuronas SON son componentes integrales de una red osmoreceptiva compleja.
Más Videos Relacionados
Videos de Conceptos Relacionados
Olfaction
The sense of smell is achieved through the activities of the olfactory system. It starts when an airborne odorant enters the nasal cavity and reaches olfactory epithelium (OE). The OE is protected by a thin layer of mucus, which also serves the purpose of dissolving more complex compounds into simpler chemical odorants. The size of the OE and the density of sensory neurons varies among species; in humans, the OE is only about 9-10 cm2.
The olfactory receptors are embedded in the cilia of the...
The olfactory receptors are embedded in the cilia of the...
Diencephalon: Hypothalamus and Coordination
The hypothalamus is a small yet highly complex and essential brain region that plays a crucial role in regulating various bodily functions. Anatomically, it is located at the base of the brain, just above the brainstem and below the thalamus, forming part of the limbic system.
The hypothalamus interacts with other brain regions, including the pituitary gland, through a direct physical connection called the hypothalamic-pituitary axis. The hypothalamus receives somatic and visceral inputs and...
The hypothalamus interacts with other brain regions, including the pituitary gland, through a direct physical connection called the hypothalamic-pituitary axis. The hypothalamus receives somatic and visceral inputs and...
Olfactory Receptors: Location and Structure
The process of olfaction, also known as the sense of smell, is a sophisticated chemical response system. The specialized sensory neurons that facilitate this process, known as olfactory receptor neurons, are situated in an upper segment of the nasal cavity, known as the olfactory epithelium. Olfactory sensory neurons are bipolar, with their dendrites extending from the epithelium's apex into the mucus that lines the nasal cavity. Airborne molecules, when inhaled, traverse the olfactory...
Physiology of Smell and Olfactory Pathway
Humans detect odors with the help of specialized cells located in the upper part of the nasal cavity, called olfactory receptor neurons (ORNs). ORNs possess hair-like structures called cilia, which are receptive to sensations from the inhaled air. When an odorant molecule binds to a specific receptor on the cell of the cilia, it leads to a series of events that ultimately cause the ORN to send electrical signals to the olfactory bulb in the brain through the olfactory nerves.
The olfactory...
The olfactory...
Regulation of Food Intake
Short-term regulation of food intake primarily involves neural signals from the gastrointestinal (GI) tract, blood nutrient levels, and GI tract hormones. Communication between the gut and brain via vagal nerve fibers plays a significant role in evaluating the contents of the gut. Clinical studies have shown that protein ingestion produces a more prolonged response in these nerve fibers compared to an equivalent amount of glucose. Additionally, the activation of stretch receptors caused by GI...
Regulation of Water Intake
Osmolality refers to the number of solute particles per kilogram of solvent in a solution. Plasma osmolality specifically indicates the total number of solute particles per kilogram of water in blood plasma. This value reflects the body's hydration status and is tightly regulated through mechanisms controlling water intake and output. While water consumption is a conscious decision, the body has intrinsic regulatory systems to maintain fluid balance. Dehydration, a state of water deficit...

