The white matter consists of myelinated fibres, or axons , that form nerve tracts ascending to and descending from the brain. In this particular stain (h&e) the grey matter can be seen in a slightly darker shade than the white matter.
Aspects of peripheral nerve embryology and clinically.
Spinal cord cross section histology. The clear space surrounding each axon is occupied in life by the myelin sheath. The white matter is composed of nerve fibers carrying ascending and descending information and makes up the outer regions of the cord. Review the organization of the spinal cord using your atlas.
The spinal cord is a long, thin, tubular structure made up of nervous tissue, which extends from the medulla oblongata in the brainstem to the lumbar region of the vertebral column.it encloses the central canal of the spinal cord, which contains cerebrospinal fluid.the brain and spinal cord together make up the central nervous system (cns). The primary purpose of this article is to evaluate the histology of peripheral nervous tissue. Cross section of the spinal cord stained with cresyl violet.
First, examine the cell bodies of the motor neurons. The tiny central canal recalls the origin of the nervous system as an infolding which closes off to form the neural tube. The cord is also segmented.
Slide 066a thoracic spinal cord thoracic spinal cord luxol blue cross view virtual slide. Dorsally, spinal halves are demarcated superficially by a dorsal median sulcus. In some slides you will be able to identify the dorsal and ventral rootlets of the spinal nerves within the subarachnoid space.
It is two lateral gray masses connected by a gray crossbar referred to as the gray commissure, all of which surrounds the central canal.the two dorsal projections of gray matter are called the dorsal (posterior) horns and the ventral (anterior) horns. The gray matter, which contains cell bodies, is located in the center of the cord and is easily identified by its color and. Histological inspection reveals that each nerve fibre is actually composed of a large number of axons whose cell bodies reside in central or peripheral ganglia, the spinal cord or the brain.
In a cross section of the spine, the gray matter looks similar to the letter h. The four main regions or segments of the spinal cord. You can see the body of the vertebra (vert) on the right, and part of the arch on the left (the arch is not labeled).
Diagram of the spinal cord./, left half of cross section, showing impulses entering the dorsal root and outgoing impulses passing out by the ventral root. It shows anterior, lateral, and posterior horns. In an adult human, the spinal cord is about 42 to 45 cm long and about 1 cm in diameter at its widest point.
Recall during development, newly formed neurons proliferate adjacent to the canal to form a mantle layer, which becomes the gray matter in the central region of the mature spinal cord. The spinal cord is bilaterally symmetrical. Cresyl violet is a basic dye that binds nucleic acids and preferentially stains rna.
Spinal cord, c.s., tb [aperio imagescope] [aperio webscope] this section contains a cross section of the spinal cord. This section is from a slide that includes both the spinal cord and a vertebra. Ventrally, the halves are separated by a ventral median fissure (into which pia mater invaginates).
Look at the section with the lowest magnification and identify the gray matter (contains large neuronal cell bodies) and the white matter. Note that these motor neurons are. At low magnification, differentiate inner gray from outer white matter and.
This slide shows a cross section through the spinal cord. Obtain a slide of a spinal cord section and prepare to examine it with the scanning objective lens. These horns form columns of gray matter that run the length of.
Many important features of the spinal cord are visible in this cross section. B, the neurons connected with the gray matter of the cord give off branches passing up and down the cord and transmitting ner'0us disturbances by. White matter surrounds the gray matter and is made of axons.
Deep to the sulcus, a dorsal median septum (caudally a fissure) separates the halves. This image shows part of a cross section of the spinal column and spinal cord (sc). In the spinal cord reside all motor neurons supplying the muscles of the entire body.
Nuclei of all cells and the nissl (chromophil) substance in neurons is. In the gray matter, examine the large motor neuron cell bodies carefully As you can tell from the location of the structures, this image does.
In humans, the spinal cord begins at the occipital. Also, look at the center and identify the central canal. #84 spinal cord, monkey, cross section (cajal's silver) open with webviewer
Note the meninges surrounding the spinal cord. This is a nice magnification for the study of the anterior horn of the gray matter because it reveals so much about the tissue while including a reasonably large area in the field of view.