Related Experiment Video
Updated: Jul 7, 2026
09:29
Stereotactically-guided Ablation of the Rat Auditory Cortex, and Localization of the Lesion in the Brain
Published on: October 11, 2017
Two thalamic pathways to primary auditory cortex
H L Read1, L M Miller, C E Schreiner
1W.M. Keck Center for Integrative Neuroscience, University of California at San Francisco, San Francisco, CA 94143, USA. heather.read@uconn.edu
Neuroscience
|January 29, 2008
Summary
Neurons in the cat auditory cortex (AI) receive input from distinct parts of the medial geniculate body (MGBv). This study reveals separate superior and inferior MGBv regions project to the central narrow bandwidth area (cNB).
Area of Science:
- Neuroscience
- Auditory Neuroscience
- Sensory Systems
Background:
- Neurons in the cat primary auditory cortex (AI) exhibit frequency tuning within a central narrow bandwidth region (cNB).
- Variability in response to sound intensity and binaural interaction exists within cNB, with its source unidentified.
Purpose of the Study:
- To investigate if input to the cNB originates from multiple, anatomically distinct subregions of the ventral nucleus of the medial geniculate body (MGBv).
Main Methods:
- Injected retrograde tracers into the cNB of cat brains.
- Analyzed labeled neuron clusters in the superior (sMGBv) and inferior (iMGBv) parts of the MGBv.
Main Results:
- Retrograde tracing revealed discontinuous neuron clusters in both sMGBv and iMGBv projecting to cNB.
- The majority of labeled neurons were located in the sMGBv, which showed higher density.
- Neurons in the iMGBv were significantly larger in size.
Conclusions:
- The findings suggest that projections to the cNB from the sMGBv and iMGBv are anatomically segregated.
- This distinct organization in the MGBv may contribute to the variability observed in cNB neuron responses.
- Further research is needed to explore the potential physiological differences between these projection pathways.
More Related Videos
Related Concept Videos
01:15Auditory Pathway
Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking the...
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking the...
01:29Overview of Somatic Sensory Pathways
Somatic sensory or somatosensory pathways refer to the neural pathways that carry information related to touch, pressure, pain, temperature, and proprioception from the skin, muscles, tendons, and joints to the brain. These pathways involve several stages of processing and integration of sensory information.
The somatosensory system is divided into three main pathways: the dorsal (or posterior) column-medial lemniscus, spinothalamic (or anterolateral), and spinocerebellar pathways.
The dorsal...
The somatosensory system is divided into three main pathways: the dorsal (or posterior) column-medial lemniscus, spinothalamic (or anterolateral), and spinocerebellar pathways.
The dorsal...
01:14Motor and Sensory Areas of the Cortex
The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex.
01:28Major Somatic Sensory Pathways
Sensory impulses related to touch, pressure, vibration, and proprioception from various body parts, such as the limbs, trunk, neck, and posterior head, travel to the cerebral cortex through the posterior column-medial lemniscus pathway. The pathway’s name derives from the two white-matter tracts that convey the impulses: the spinal cord's posterior column and the brainstem's medial lemniscus. First-order sensory neurons extend their axons into the spinal cord, forming the posterior columns...
01:27Diencephalon: Thalamus and Information Relay
The thalamus, often called “the gateway to the cerebral cortex,” is vital in processing and directing sensory and motor signals throughout the brain. Almost all inputs destined for the cerebral cortex, except for olfactory signals, are relayed through the thalamus. The thalamus is a sophisticated relay station, channeling information from various brain regions to the cerebral cortex, as well as a filter, prioritizing certain signals over others based on current physiological states or needs.
01:31Hearing
When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.