What are the lines of the CNS?
What are the lines of the CNS?
Ependymal cells are ciliated and line the central cavities of the brain and spinal cord where they form a fairly permeable barrier between the cerebrospinal fluid that fills these cavities and the tissue cells of the CNS.
What is CNS composed of?
The CNS is the processing centre of the body and consists of the brain and the spinal cord. Both of these are protected by three layers of membranes known as meninges.
Is myelin sheath made of Schwann cells?
The myelin sheath is a greatly extended and modified plasma membrane wrapped around the nerve axon in a spiral fashion [1]. The myelin membranes originate from and are a part of the Schwann cells in the peripheral nervous system (PNS) and the oligodendroglial cells in the central nervous system (CNS) (see Chap. 1).
What are the four types of Neuroglia in the CNS?
Based upon their appearance, function, and origin, four types of glial cells have been identified in the central nervous system: astrocytes, oligodendroglia, ependymal cells, and microglia.
What type of neuron is found entirely in the CNS?
Interneurons, or association neurons, are located entirely within the CNS in which they form the connecting link between the afferent and efferent neurons. They have short dendrites and may have either a short or long axon.
What does the myelin sheath consists of?
Myelin sheath consists of lipids and proteins which make up a fatty substance and is white in appearance. This forms the protective sleeve that wraps around the axon of neurons. The sheath is made up of many concentric layers of plasma membrane, wrapped tightly around the axon. There are breaks of between 0.2 and 2 mm.
What does the CNS consist of?
The CNS is the brain and spinal cord. The CNS consists of the brain and spinal cord. The brain is protected by the skull (the cranial cavity) and the spinal cord travels from the back of the brain,…
What is the difference between the CNS and peripheral nervous system?
The term peripheral nervous system (PNS) refers to any part of the nervous system that lies outside of the brain and spinal cord. The CNS is separate from the peripheral nervous system, although the two systems are interconnected. There are a number of differences between the CNS and PNS; one difference is the size of the cells.
What is the function of the spinal cord in the CNS?
The spinal cord is a vital aspect of the CNS found within the vertebral column. The purpose of the spinal cord is to send motor commands from the brain to the peripheral body as well as to relay sensory information from the sensory organs to the brain. Spinal cord protection is by bone, meninges, and cerebrospinal fluids.
What are the two major structures of the central nervous system?
The central nervous system consists of the two major structures: the brain and spinal cord. The brain is encased in the skull, and protected by the cranium.
