Related Experiment Video
Updated: Aug 11, 2026
12:53
Electrophysiological Recordings from the Giant Fiber Pathway of D. melanogaster
Published on: January 14, 2011
Descending pathways and the hopping response in the rabbit
J F Hobbelen1, A Gramsbergen, M W van Hof
1Department of Physiology I, Erasmus University Medical School, Rotterdam, The Netherlands.
Behavioural Brain Research
|November 15, 1992
Summary
Researchers identified descending brain pathways in rabbits using HRP injections. Key findings reveal connections from the motor cortex, red nucleus, vestibular nuclei, and reticular formation to the spinal cord.
Area of Science:
- Neuroscience
- Spinal Cord Research
- Neuroanatomy
Background:
- Understanding descending motor control pathways is crucial for neuroscience.
- The specific origins and targets of these pathways in rabbits remain incompletely characterized.
Purpose of the Study:
- To investigate the origins of descending spinal cord pathways in adult rabbits.
- To map projections from supraspinal centers to the cervical spinal cord.
Main Methods:
- Horseradish peroxidase (HRP) was injected into the C2 and C3 spinal cord segments on the right side of 5 adult rabbits.
- Anterograde and retrograde tracing techniques were employed to identify neuronal connections.
Main Results:
- Evidence of descending pathways originating from the contralateral motor cortex.
- Bilateral projections were observed from the red nuclei, vestibular nuclei, and various nuclei within the reticular formation.
- These findings elucidate the complex neural circuitry influencing motor control.
Conclusions:
- The study confirms the existence of multiple supraspinal descending pathways influencing the cervical spinal cord in rabbits.
- These pathways play a significant role in motor control and coordination.
Related Concept Videos
01:25Neural Circuits
Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...
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...
01:28Major 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...
01:11Direct Motor Pathways
The direct motor pathways, also known as the pyramidal tracts, are a group of neural pathways that originate in the brain and descend through the spinal cord. They control the voluntary movement of the body. There are two major direct motor pathways: the corticospinal and the corticobulbar tracts.
The corticospinal tract is responsible for the voluntary movement of the limbs and trunk. It originates in the cerebral cortex of the brain and descends through the cerebrum's internal capsule and the...
The corticospinal tract is responsible for the voluntary movement of the limbs and trunk. It originates in the cerebral cortex of the brain and descends through the cerebrum's internal capsule and the...
01:22Indirect Motor Pathways
The indirect motor or extrapyramidal pathways originate in the brainstem, the lower portion of the brain that connects it to the spinal cord. They consist of several distinct tracts, each with specialized functions. The four main tracts of the indirect motor pathways are the vestibulospinal tract, the reticulospinal tract, the tectospinal tract, and the rubrospinal tract.
The vestibulospinal tract originates in the vestibular nuclei of the brainstem. The vestibular system detects changes in...
The vestibulospinal tract originates in the vestibular nuclei of the brainstem. The vestibular system detects changes in...
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...