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Videos de Conceptos Relacionados

Olfaction01:25

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...
Somatosensation01:33

Somatosensation

The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.
Sensory Functions of the Skin01:16

Sensory Functions of the Skin

The skin is the largest organ of the human body and plays a crucial role in our sensory perception. It contains a vast network of sensory receptors that contribute to the skin's protective function by perceiving physical, biological, and environmental cues and generating relevant responses.
There are two main categories of receptors on the skin: capsulated and non-capsulated. The non-capsulated ones are mainly the pain receptors. The capsulated ones can be further categorized based on the...
Introduction to Special Senses01:26

Introduction to Special Senses

Sensory receptors play an integral part in comprehending our external and internal environments. They receive diverse stimuli, converting them into the nervous system's electrochemical signals. This conversion occurs as the stimulus alters the sensory neuron's cell membrane potential, instigating the generation of an action potential. This action potential is subsequently transmitted to the central nervous system (CNS), which integrates with other sensory data or higher cognitive functions.
Physiology of Smell and Olfactory Pathway01:20

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...
Tactile and Chemical Senses01:27

Tactile and Chemical Senses

Tactile senses encompass touch, temperature, and pain, each mediated by specific receptors. Touch receptors detect mechanical energy or pressure against the skin. Sensory fibers from these receptors enter the spinal cord and relay information to the brain stem. Here, most fibers cross over to the opposite side of the brain. The touch information then moves to the thalamus, which projects a map of the body's surface onto the somatosensory areas of the parietal lobes in the cerebral cortex. This...

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Video Experimental Relacionado

Updated: Jul 7, 2026

Flat Mount Imaging of Mouse Skin and Its Application to the Analysis of Hair Follicle Patterning and Sensory Axon Morphology
13:58

Flat Mount Imaging of Mouse Skin and Its Application to the Analysis of Hair Follicle Patterning and Sensory Axon Morphology

Published on: June 25, 2014

Localización funcional y lateralización de la corteza olfativa humana.

R J Zatorre1, M Jones-Gotman, A C Evans

  • 1McConnell Brain Imaging Centre, Montreal Neurological Institute, Quebec, Canada.

Nature
|November 26, 1992
PubMed
Resumen
Este resumen es generado por máquina.

Este estudio utilizó imágenes cerebrales para mapear el procesamiento del olfato humano. Los hallazgos revelan que la corteza piriforme y la corteza orbitofrontal derecha son áreas clave, lo que sugiere un papel especializado para el hemisferio derecho del cerebro en el olfato.

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Last Updated: Jul 7, 2026

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Área de la Ciencia:

  • La neurociencia es la neurociencia.
  • Investigación del sistema olfativo de investigación del sistema olfativo.
  • Estudios de imágenes cerebrales estudios de imágenes cerebrales.

Sus antecedentes:

  • Mientras que los estudios en animales identifican múltiples regiones corticales para el olfato, las áreas olfativas humanas carecen de una identificación funcional definitiva.
  • Los datos conductuales sugieren un procesamiento lateral del olor, pero la neuroanatomía subyacente no está clara.

Objetivo del estudio:

  • Identificar funcionalmente las regiones corticales humanas involucradas en el procesamiento olfativo.
  • Para investigar la posible lateralización en el sistema olfativo humano.

Principales métodos:

  • Se empleó tomografía por emisión de positrones (PET) para medir el flujo sanguíneo cerebral.
  • La estimulación olfativa se comparó con una tarea de control para identificar las regiones cerebrales activadas.

Principales resultados:

  • Se observaron aumentos significativos en el flujo sanguíneo cerebral bilateralmente en la unión de los lóbulos frontal inferior y temporal (corteza piriforme).
  • Se encontró un aumento unilateral en el flujo sanguíneo cerebral en la corteza orbitofrontal derecha.
  • Estos hallazgos indican una asimetría funcional, con un dominio del hemisferio derecho en la corteza orbitofrontal para el olfato.

Conclusiones:

  • La corteza piriforme y la corteza orbitofrontal derecha son regiones funcionales clave para el olfato humano.
  • La evidencia apoya una asimetría funcional en el cerebro humano, favoreciendo la corteza orbitofrontal derecha en el procesamiento olfativo.