[Long ascending fibers in the dorsal column of a teleost fish: a disynaptic pathway connecting sense organs to cerebellum].

C R Acad Sci III

Département de Neurophysiologie sensorielle, C.N.R.S., Gif-sur-Yvette.

Published: February 1992

In spite of the generally accepted opinion that long ascending proprioceptive and tactile fibers do not occur in the spinal dorsal columns of teleost fish, it was demonstrated with degeneration and axonal transport tracing methods that such dorsal column fibers exist in the teleost fish Gnathonemus petersii. These fibers are in fact common spinal afferent fibers originating in spinal ganglion cells. They connect the peripheral sense organs with the lateral funicular nuclei (Fl2) in which the dorsal column fibers terminate, directly through the dorsal columns. In contrast to the dorsal column nuclei of higher vertebrates, the Fl2 nuclei do not project to the diencephalic thalamus but to the caudal lobe and the second lobe (C2) of the corpus cerebelli. Thus, sense organs and cerebellum are connected by a disynaptic pathway. Since the caudal lobe projects directly to the electrosensory lobe, that is, to the target of electrosensory afferents, the presence of a disynaptic pathway in G. petersii suggests the existence of a proprioceptive control of the electrosensory input.

Download full-text PDF

Source

Publication Analysis

Top Keywords

dorsal column
16
teleost fish
12
disynaptic pathway
12
sense organs
12
dorsal columns
8
column fibers
8
caudal lobe
8
fibers
6
dorsal
6
[long ascending
4

Similar Publications

Spinal cord cross sign: a potential marker for hereditary spastic paraplegia type 5.

Neuroradiology

January 2025

Department of Radiology, The First Affiliated Hospital of Fujian Medical University, No. 20, Chazhong Rd., Taijiang District, Fuzhou, 350005, Fujian, China.

Purpose: Spastic paraplegia type 5 (SPG5) is a rare neurodegenerative disease diagnosed primarily through genetic testing.We identified a specific spinal cord sign on conventional MR imaging to help narrow the scope of genetic screening.

Methods: In 25 patients with SPG5 and 21 healthy controls (HCs), the spinal cord cross sign was evaluated on T2*-weighted imaging.

View Article and Find Full Text PDF

Objective: Investigating the clinical efficacy of treating dorsally displaced distal radial double-column Die-punch fractures using a dorsal approach external fixator combined with Kirschner wires.

Methods: Retrospectively analyzed the clinical data of 15 patients with distal radial double-column Die-punch fractures treated with an external fixator combined with Kirschner wire between July 2020 and January 2023. There were 10 males and 5 females;6 cases on the left side and 9 on the right;age ranged from 22 to 76 years old.

View Article and Find Full Text PDF

A hydrodynamic antenna: novel lateral line system in the tail of myliobatid stingrays.

Proc Biol Sci

January 2025

Department of Organismic and Evolutionary Biology, Harvard University, 26 Oxford Street, Cambridge, MA 02138, USA.

Eagle rays, cownose rays and manta rays (order Myliobatiformes) have a slender tail that can be longer than the animal's body length, but its function and structure are unknown. Using histology, immunohistochemistry and three-dimensional imaging with micro-computed tomography scans, we describe the anatomy and function of the tail in , the cownose ray. The tail is an extension of the vertebral column with unique morphological specializations.

View Article and Find Full Text PDF

Lesions of the dorsal columns of the spinal cord in adult macaque monkeys lead to the loss of hand inputs and large-scale expansion of the face inputs in the hand region of the somatosensory cortex. Inputs from alternate spinal pathways do not reactivate the deafferented regions of area 3b. Here, we determined how transections of the dorsal columns done within a few days after birth affect the developing somatosensory cortex.

View Article and Find Full Text PDF

Objective: To compare the efficacy of closed-loop spinal cord stimulation (CL-SCS) and dorsal root ganglion (DRG) stimulation in managing chronic cancer-related pain.

Material/methods: A retrospective review was conducted with IRB exemption for four patients with cancer-related pain who underwent combination stimulator trials. Patients were trialed with both CL-SCS and DRG stimulation for 8-10 days, with assessments of pain relief, functional improvement, sleep improvement, pain medication changes, and overall satisfaction.

View Article and Find Full Text PDF

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!