Anatomy of Peripheral Nerves Peripheral nerves consist of fascicles that contain myelinated and unmyelinated axons. Endoneurium is the small amount of matrix that is present between individual axons. The perineurium is a sheath of special‚ fiber-like cells that ties the axons of each fascicle together. Epineurium is the connective tissue that surrounds the entire nerve trunk and gives off vascular connective tissue septa that traverse the nerve and separate fascicles from one another. | | Single
Premium Nervous system Action potential Axon
Report 2 -Karthik raj Konnaiyan Patellar reflex: Patellar reflex is contributed by 3rd and 4th Lumbar segment nerves‚ in some cases 2nd lumbar segment is also involved. So an individual will be left with patellar reflex if these lumbar vertebrae are left intact. Patellar reflex is also called knee-jerk reflex as the names implies‚ it is involved with tapping of knee at certain point will cause a jerk movement. In medical terms when an individual is tapped on patellar tendon (area below the knee
Premium Joint Nervous system Brain
important to mention the Neuron as carrier impulses from the CNS to the periphery‚ the peripheral nerves in turn have the funsion to carry messages from one part of the organism to another‚ so we can understand the action of these drugs. They act in the prevention‚ generation and propagation of the nervous impulse. Acting on the blocking of the depolarization initiation‚ allowing Na + to enter the nerve cell from rest to the trigger threshold (- 50a - 60 mV) would consequently impede the initiation
Premium Nervous system Brain Neuron
HOW DOES THE STRUCTURE OF NEURONES REFLECT THEIR FUNCTION The neuron or nerve cell is the structural unit of the nervous system. It is able to transmit messages between the central nervous system (CNS) and all parts of the body. There are two basic types of neuron namely - the sensory neuron (afferent) and the motor neuron (efferent) (Bear et al.‚ 3rd edition). The sensory neurons (Fig. 1-1) are capable of transmitting the sensation of pain and consist of three major portions which are the dendritic
Premium Nervous system Axon Action potential
H E E T EXERCISE 21 Print Form Spinal Cord‚ Spinal Nerves‚ and the Autonomic Nervous System Anatomy of the Spinal Cord 1. Match each anatomical term in the key to the descriptions given below. Key: a. cauda equina 1. 2. 3. 4. b. conus medullaris c. filum terminale d. foramen magnum most superior boundary of the spinal cord meningeal extension beyond the spinal cord terminus spinal cord terminus collection of spinal nerves traveling in the vertebral canal below the terminus of the spinal
Premium Spinal cord Parasympathetic nervous system
death rates from heart disease‚ stroke‚ accidents‚ etc. The nervous system is a network of neurons (nerve cells) that that sends information to the brain to be analyzed. Neurons live both in and outside the central nervous system. Understanding how the neurons work is vital to understanding the nervous system. Neurons The neuron has two important structures called the dendrite and axon‚ also called nerve fibers. The dendrites are like tentacles that sprout from the cell and the axon is one long extension
Premium Nervous system Neuron Brain
up the CNS. Its main job is to get the information from the body and send out instructions. The peripheral nervous system is made up of all of the nerves and the wiring. This system sends the messages from the brain to the rest of the body. -The peripheral nervous system consists of the nerves that lie outside the brain and the spinal cord. These nerves carry impulses like sensations and information from the body to the spinal cord and from the spinal cord to the body. Thus‚ the peripheral nervous
Premium Nervous system Peripheral nervous system Autonomic nervous system
spinal cord‚ and nerves. These organs mostly consist of Nervous Tissues. http://www.nlm.nih.gov/medlineplus/ency/images/ency/fullsize/19588.jpg Nervous Tissues Nervous tissues are made up of two main types of cells: nerve cells/neurons and neuroglia. The main functions of nervous tissues are to react to stimuli and generate impulses to various organs in the body. http://www.occc.edu/deanderson/dennis-tutorial/dennis-jpeg/Nervous%20Tissue-low%20mag%20D-1%20copy Nerve cells and Neuroglia
Premium Brain Nervous system Central nervous system
systems. Cnidarians have a network of loosely arranged nerve cells throughout their bodies‚ forming a nerve net. Flatworms such as planarians exhibit a rudimentary brain with nerve cords traversing the length of their bodies. Mammals have highly evolved nervous systems. They have large brains which process information and sense organs located near the brain. The human nervous system is made up of nerves‚ the brain‚ and the spinal cord. The nerves themselves do not form one single system‚ but several
Premium Nervous system Neuron Brain
Chapter 13: Brain and Cranial Nerves Multiple Choice 1. Which of the following statements concerning the brainstem is true? A) The brainstem consists of the medulla‚ pons‚ and cerebellum. B) The brainstem is responsible for higher level thinking skills. C) Damage to the brainstem is usually fatal. D) All twelve cranial nerves enter or exit from the brainstem. E) The brainstem is a relay for sensory input. Answer: c Level: 1 2. In the CNS‚ clusters of gray matter containing cell bodies
Premium Brain Central nervous system Nervous system