In chick, the tectal and posterior commissures form a continuous band of axons lying in the dorsal aspect of the meso-diencephalon. In midline sagittal sections, two zones can be clearly defined. The rostral zone (RZ) contains about 290,000 axons of which 32% are myelinated. The caudal zone (CZ) contains about 911,000 fibers of which 12% are myelinated. The majority of unmyelinated fibers in RZ and CZ are between 0.15 and 0.40 micrometers in diameter. The majority of myelinated fibers in both RZ and CZ are less than 1 micrometer in diameter. It is likely that RZ corresponds to the posterior commissure while CZ corresponds to the tectal commissure.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/0304-3940(82)90237-3 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Consciousness disturbance in patients with chronic kidney disease: Rare but potentially treatable complication. Clinical and neuroradiological review.
Behav Brain Res
December 2024
Radiology and Neuroradiology Unit, Department of Imaging, Radiation Therapy and Hematology, Università Cattolica del Sacro Cuore, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Largo A. Gemelli, 1, Rome 00168, Italy.
Article Synopsis
- In patients with chronic kidney disease undergoing dialysis, brain complications like Posterior Reversible Encephalopathy Syndrome and uremic encephalopathy can develop, with their potential reversibility depending on early detection and treatment.
- Neurological symptoms can range widely from mild consciousness disturbances to coma, and imaging plays a crucial role in diagnosing the specific underlying issues.
- Complications linked to dialysis include Dialysis Disequilibrium Syndrome and Osmotic Demyelination Syndrome, each showing unique imaging patterns, but accurate diagnosis often requires a detailed clinical history and lab results due to occasionally overlapping features.
Occipital Interhemispheric Retrocallosal Transtentorial Approach to a Tectal Tumor in an 8-Year-Old Girl: Operative Video.
World Neurosurg
October 2024
Unit of Neurosurgery, Department of Neurosciences, Santobono-Pausilipon Children's Hospital, Naples, Italy.
Tectal plate tumors are a rare subset of midbrain tumors in pediatric populations. They are slow growing and low grade, with indolent and subtle manifestation unless they cause hydrocephalus. We present a tectal tumor in an 8-year-old girl (Video 1).
View Article and Find Full Text PDFExcitatory Projections of Wide Field Collicular Neurons to the Nucleus of the Optic Tract in the Rat.
J Comp Neurol
July 2024
School of Medicine, University of Crete, Heraklion, Greece.
The superficial layers of the mammalian superior colliculus (SC) contain neurons that are generally responsive to visual stimuli but can differ considerably in morphology and response properties. To elucidate the structure and function of these neurons, we combined extracellular recording and juxtacellular labeling, detailed anatomical reconstruction, and ultrastructural analysis of the synaptic contacts of labeled neurons, using transmission electron microscopy. Our labeled neurons project to different brainstem nuclei.
View Article and Find Full Text PDFA novel radiological classification of midbrain pilocytic astrocytomas and its implication for surgical management: a single-institution experience of 57 cases.
J Neurosurg
June 2024
1Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing.
Objective: Surgery for midbrain pilocytic astrocytoma (PA) remains a formidable challenge. To facilitate decision-making and achieve a better outcome in the management of patients with midbrain PA, the authors have proposed a novel radiological classification of midbrain PAs with long-term follow-up.
Methods: Fifty-seven midbrain PA patients who underwent surgery at Beijing Tiantan Hospital, Capital Medical University, from January 2008 to June 2021, were reviewed.
Pax3 lineage-specific deletion of Gpr161 is associated with spinal neural tube and craniofacial malformations during embryonic development.
Dis Model Mech
November 2023
Department of Pediatrics, Dell Pediatric Research Institute, Dell Medical School, University of Texas at Austin, Austin, TX 78723, USA.
Sonic hedgehog (Shh) signaling is the morphogen signaling that regulates embryonic craniofacial and neural tube development. G protein-coupled receptor 161 (Gpr161) is a negative regulator of Shh signaling, and its inactivation in mice results in embryo lethality associated with craniofacial defects and neural tube defects. However, the structural defects of later embryonic stages and cell lineages underlying abnormalities have not been well characterized due to the limited lifespan of Gpr161 null mice.
View Article and Find Full Text PDFWant 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!