Biomaterial Database

Cervical and reticular projections of neurones located in S1 and S2 segments of the cat's spinal cord. 1998

W Mrówczyński, and K Grottel, and P Krutki

Department of Neurobiology, University School of Physical Education, Poznań, Poland.

Sacral neurones (S1 and S2 segments) projecting to the cervical cord (C6 segment) and to the contralateral gigantocellular reticular nucleus (coGRN) were electrophysiogically studied on 7 adult cats under alpha-chloralose anaesthesia. Antidromic action potentials were recorded from 48 neurones following stimulation of their axons in both the C6 segment and coGRN. Two groups of investigated cells were distinguished in the gray matter of sacral segments: one distributed in laminae V-VI (12 neurones), the other located in medial part of lamina VII and lamina VIII (36 neurones). All cells from the first group projected to C6. The latter group consisted of three types of neurones: projecting to C6 (n = 9), to coGRN (n = 1) as well as to both C6 and coGRN (n = 26). Axons of all identified neurones ran in lateral funiculi ipsilaterally, contralaterally or bilaterally. Conduction velocities were comprised in the ranges 35-81 m/s and 34-70 m/s for neurones projecting to the reticular formation and the cervical spinal cord, respectively. Decrease in conduction velocities was found in some axons in their distal parts suggesting more extensive divergence to various segments in the spinal cord or supraspinal centres.

UI	MeSH Term	Description	Entries
D009431	Neural Conduction	The propagation of the NERVE IMPULSE along the nerve away from the site of an excitation stimulus.	Nerve Conduction,Conduction, Nerve,Conduction, Neural,Conductions, Nerve,Conductions, Neural,Nerve Conductions,Neural Conductions
D009434	Neural Pathways	Neural tracts connecting one part of the nervous system with another.	Neural Interconnections,Interconnection, Neural,Interconnections, Neural,Neural Interconnection,Neural Pathway,Pathway, Neural,Pathways, Neural
D009474	Neurons	The basic cellular units of nervous tissue. Each neuron consists of a body, an axon, and dendrites. Their purpose is to receive, conduct, and transmit impulses in the NERVOUS SYSTEM.	Nerve Cells,Cell, Nerve,Cells, Nerve,Nerve Cell,Neuron
D012154	Reticular Formation	A region extending from the PONS & MEDULLA OBLONGATA through the MESENCEPHALON, characterized by a diversity of neurons of various sizes and shapes, arranged in different aggregations and enmeshed in a complicated fiber network.	Formation, Reticular,Formations, Reticular,Reticular Formations
D002415	Cats	The domestic cat, Felis catus, of the carnivore family FELIDAE, comprising over 30 different breeds. The domestic cat is descended primarily from the wild cat of Africa and extreme southwestern Asia. Though probably present in towns in Palestine as long ago as 7000 years, actual domestication occurred in Egypt about 4000 years ago. (From Walker's Mammals of the World, 6th ed, p801)	Felis catus,Felis domesticus,Domestic Cats,Felis domestica,Felis sylvestris catus,Cat,Cat, Domestic,Cats, Domestic,Domestic Cat
D004594	Electrophysiology	The study of the generation and behavior of electrical charges in living organisms particularly the nervous system and the effects of electricity on living organisms.
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D001369	Axons	Nerve fibers that are capable of rapidly conducting impulses away from the neuron cell body.	Axon
D012447	Sacrum	Five fused VERTEBRAE forming a triangle-shaped structure at the back of the PELVIS. It articulates superiorly with the LUMBAR VERTEBRAE, inferiorly with the COCCYX, and anteriorly with the ILIUM of the PELVIS. The sacrum strengthens and stabilizes the PELVIS.	Sacra,Sacral Vertebra,Sacral Vertebrae,Sacrums,Vertebra, Sacral,Vertebrae, Sacral
D013116	Spinal Cord	A cylindrical column of tissue that lies within the vertebral canal. It is composed of WHITE MATTER and GRAY MATTER.	Coccygeal Cord,Conus Medullaris,Conus Terminalis,Lumbar Cord,Medulla Spinalis,Myelon,Sacral Cord,Thoracic Cord,Coccygeal Cords,Conus Medullari,Conus Terminali,Cord, Coccygeal,Cord, Lumbar,Cord, Sacral,Cord, Spinal,Cord, Thoracic,Cords, Coccygeal,Cords, Lumbar,Cords, Sacral,Cords, Spinal,Cords, Thoracic,Lumbar Cords,Medulla Spinali,Medullari, Conus,Medullaris, Conus,Myelons,Sacral Cords,Spinal Cords,Spinali, Medulla,Spinalis, Medulla,Terminali, Conus,Terminalis, Conus,Thoracic Cords