nervous tissue histology ppt
For now, focus just on the morphology of these regions and observe the presence of three distinct layers rather than the six layers found in the cerebral cortex (evolutionarily speaking, the three-layered organization is considered to be "older," so this type of cortex is also known as "archicortex" whereas the "newer" six-layered cerebral cortex is "neocortex"). Unipolar neurons have only one process emerging from the cell body which causes them to appear T-shaped. The white matter contains nerve fibers (axons) entering and exiting the gray matter, and traveling up and down the spinal cord, linking it to the brain. It has a similar role as the nervous system, working in tandem with it to maintain homeostasis of the body. There are many neurons in the nervous systema number in the trillions. Movement on one side of the body is often controlled by nerve impulses originating on the opposite side of the brain. Based on the number of processes, neurons are classified into multipolar, bipolar and unipolar. Mescher, A. L. (2013). behaviors, memories, and movements. Type II pneumocytes are also important because they secrete surfactant which prevents the lungs from collapsing. Register now Pyramidal cells and olfactory cells are two other examples of neurons named for these classifications which will be discussed later. Ross, H. M, Pawlina, W. (2011). White matter consists of myelinated axons. Ana 211 (Histology of Nervous tissue).pptx sunday godwin obaje Read Now Download Free PDF Related Papers Cancer Registry Report 2000 2002 Robina Greaves Download Free PDF View PDF Identification of OTX2 as a Medulloblastoma Oncogene Whose Product can be Targeted by All-Trans Retinoic Acid Timothy Parrett Download Free PDF View PDF Use the virtual slide of the hippocampal region to study the ependymal cell lining of the choroid plexus. The choroid plexus is a specialized structure in the ventricles where ependymal cells come in contact with blood vessels and filter and absorb components of the blood to produce cerebrospinal fluid. Neurons in the dorsal horn are essentially interneurons that project to other regions of the CNS (e.g. This ground substance, also referred to as Wharthons jelly, provides insulation and protection to the blood vessels of the umbilical cord. Still deeper is the white matter slide 077 View Image of the cerebellum, which contains nerve fibers, neuroglial cells, small blood vessels, but no neuronal cell bodies. Ongoing research pursues an expanded role that glial cells might play in signaling, but neurons are still considered the basis of this function. It acts as insulation, much like the plastic or rubber that is used to insulate electrical wires. Each gap is called a node of Ranvier and is important to the way that electrical signals travel down the axon. Under light microscopy, skeletal and cardiac muscles appear striated due to the parallel arrangement of their contractile filaments into repeating units called sarcomeres. Tissue preparation, tissue staining, microscopy, hybridisation. Histology of nervous tissue1 Kifayat Khan 855 views 26 slides Nervous tissue2k1 Hatesh Mahtani 4.8k views 109 slides General histology || Nervous tissue Ali Nasser 457 views 8 slides Nervous tissue i kohlschuetter 3.3k views 25 slides Nervous tissue 1 aiyub medicine 4.3k views 90 slides Introduction to Neuropathology Cassie Porebski Examine the boundary between molecular and granule cell layers. The first way to classify them is by the number of processes attached to the cell body. The alimentary canal is a tube extending from the mouth to the anus that serves as a channel for food and water to be digested, their nutrients absorbed and indigestible portions excreted. The neuronal bodies within the grey matter are organized into layers (laminae). Study with Quizlet and memorize flashcards containing terms like Afferent, efferent, visceral and more. Once urine is formed from the ultrafiltrate, it travels through the excretory pathway of tubes, all of which are lined by transitional epithelium with the exception of some parts of the urethra. Neurons. Microglia are, as the name implies, smaller than most of the other glial cells. This preserves it into the same state that it had when it was in the body, and thus, keeps it from degrading. The musculoskeletal system consists of hard tissues (bones, joints, cartilage) and soft tissues (muscles, tendons, ligaments). Nervous Tissue DR. DEVI 1 16-4-19 2. Some cutting edge research suggests that certain neurons in the CNS do not conform to the standard model of one, and only one axon. The four main types of stains used in histology are empirical, histochemical, enzyme histochemical and immunohistochemical. The only freely mobile joints are synovial joints, in which adjacent joint surfaces are covered with hyaline cartilage, a soft type of cartilage rich in glycoproteins, proteoglycans and type II collagen. Like the spleen and lymph nodes, the immune cells in this tissue can mount an immune response against foreign invading material. Did you know that chronic alcoholics have a lot more smooth endoplasmic reticulum concentrations in their hepatocytes? 1:00 - 2:55 Cartilage and Bone ppt | pdf | lecture recording. All of these features give muscles the ability to contract and perform various functions, such as movement of the extremities (skeletal muscle), peristalsis of the gastrointestinal tract (smooth muscle) and beating of the heart (cardiac muscle). The nasal cavity contains specialized olfactory epithelium, providing the sense of smell. Myelin is a lipid-rich sheath that surrounds the axon and by doing so creates a myelin sheath that facilitates the transmission of electrical signals along the axon. By examining a thin slice of bone tissue under a microscope, colorized with special staining techniques, you see that these seemingly simple bones are actually a complex microworld containing an array of structures with various different functions. New York, NY: McGraw-Hill Education. Thus are essential for maintaining homeostasis of the body. Two nodes of Ranvier are circled in Figure 9 below. Neuroglia. Chapter 12Nervous Tissue. Next, the tissue is embedded with paraffin wax, which firms the tissue enough permit thin slices. They are responsible for the electrical signals that communicate information about sensations, and that produce movements in response to those stimuli, along with inducing thought processes within the brain. as white matter? Hair follicles are invaginations of the epidermis that contain rapidly proliferating and keratinizing cells responsible for the production and growth of hair. Review the organization of gray and white matter in cerebral cortex vs. spinal cord. They include hair follicles, skin glands and nails. Multipolar neurons are all of the neurons that are not unipolar or bipolar. Both respond immunologically to foreign material in the fluid passing through. The glomerulus contains some interesting cells, such as mesangial cells which have supportive and phagocytic properties; juxtaglomerular cells that secrete renin which acts, in a broad sense, to help regulate our blood pressure; podocytes that control the permeability of the filtration membrane; and many more. Description: Chapter 11 Histology of Nervous Tissue J.F. Title: PowerPoint Presentation Author: Jennifer Ann Jost Last modified by: Jeff Keyte Created Date: 10/29/2003 10:25:53 PM Document presentation . Skin appendages are derivatives of the epidermis. For example, nerves can be classified based on their function. It consists of the mouth, pharynx, esophagus, stomach, small intestine, large intestine and anus. Access to the supplemental resources for this session is password-protected and restricted to University of Michigan students. Because of this, only specific types of molecules can enter the CNS. Histology 5.ppt CT, Bone Histology 5 supplement.ppt : Histology 6.ppt Muscle: Histology Lab 4.doc Muscle and Start of Nervous Tissue: Histology 7.ppt M, Nervous: Histology Lab 5.doc Nervous (continued), Digestion Start: Histology 8.ppt Nervous : Histology 9.ppt : Histology 10.ppt Nervous: Histology11.ppt CNS, Digestion : Histology 12.ppt . Uploaded on Jun 06, 2013 Elina + Follow cuboidal epithelium water loss Primarily, the PNS is made up of the axons of neurons whose cell bodies are located within the CNS (within the brain for cranial nerves and the spinal cord for peripheral nerves yet another way to divide the nervous system based on location). within limits that maintain life. Contents Neuron Nerve cell processes Synapses And impulse transmission The neuroglia Myelin sheath 2 3. EM works by emitting parallel beams of electrons onto the tissue sample. The projections connect at the dendrites and are so extensive that they give the microglial cell a fuzzy appearance. Bipolar cells have two processes, which extend from each end of the cell body, opposite to each other. The function of myelin will be discussed below. The lateral extension of the ventral horn slide 065-2 contains relatively large, multipolar visceral motor neurons of the intermediolateral cell column that extends from levels T1 through L2 of the spinal cord. Using only histological evidence, could you determine from where in the nervous system a sample of tissue was taken? Very little can pass through by diffusion. The most used tool today for examining cells, tissues and organs is optic (light) microscopy. ("6" in the orientation figure) a molecular layer containing dendrites of the granule cells. Test yourself on cardiac muscle tissue with the following quiz. The tools for studying histology are becoming more diverse everyday. The BBB also makes it harder for pharmaceuticals to be developed that can affect the nervous system. system is called neurology. Neurons are specialized cells that contain a body (soma) and one or more processes ( dendrites, axons ). T and B lymphocytes are born and raised in the thymus and bone marrow, respectively. Epithelial tissue can cover external surfaces (skin), line the inside of hollow organs (intestines) or form glands. Interstitial cells produce testosterone, a hormone that regulates spermatogenesis. Learn more about the histology of the upper and lower digestive tract. These sections are then mounted on a glass slide, using a mounting medium as an adhesive. They are highly specialized to transmit nerve impulses. With the exception of the unipolar sensory ganglion cells, and the two specific bipolar cells mentioned above, all other neurons are multipolar. Neurons are characterized by a large cell body or perikaryon containing a large, pale (active, euchromatic) nucleus with a prominentnucleolus. What is the distinction between the CNS and the PNS? They are electrically active and release chemical signals to target cells. The relationship of these two types of glial cells to ganglia and nerves in the PNS is seen in Figure 5. Download Presentation Histology of Nervous Tissue An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Last reviewed: November 28, 2022 Note that sacral levels of the cord (levels S2-4) also contain visceral motor neurons in the lateral horn, but these are parasympathetic. This technique is used for determining the location of specific DNA or RNA sequences in cells or chromosomes, making it useful for various research and diagnostic purposes. All content published on Kenhub is reviewed by medical and anatomy experts.