Definition Of Nerve Cord

A single hollow tract of nervous tissue that constitutes the central nervous system of chordates and develops into the spinal cord and brain in vertebrates. Dorsal root ganglia of spinal nerves and the ganglia of selected cranial nerves.

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The brain located in the anterior portion of the animal is composed of two cephalic ganglia joined by a broad.

Definition of nerve cord. SCI can be caused by direct injury to the spinal cord itself or from damage to the tissue and bones vertebrae that surround the spinal cord. The dorsal nerve cord is later. The hollow dorsal tract of nervous tissue that constitutes the central nervous system of all chordates and that developed as the spinal cord and brain of vertebrates. The pair of closely united ventral longitudinal nerves with their segmental ganglia that is characteristic of many elongate invertebrates such as earthworms 2. The dorsal hollow nerve cord is a hollow cord dorsal to the notochord. Most spinal levels have 4 total nerve roots with 2 on each side.

Simple bilateral systemsPlanaria consists of a brain longitudinal nerve cords and peripheral nerve plexuses interlacing networks of peripheral nerves. Any of a series of paired nerves that originate in the nerve roots of the spinal cord and emerge from the vertebrae on both sides of the spinal column each branching out to innervate a specific region of the neck trunk or limbs. A dorsal tubular cord of nervous tissue above the notochord of a chordate. Sympathetic close to the spinal cord Parasympathetic neer on in the viscera. The anterior ventral root carries motor signals from the brain out to the muscles and the. The ventral nerve cord of an earthworm is shown in figure 2.

The nerves conduct impulses toward or away from the central nervous mechanism. The major cord of nerve fibres running the length of an animals body especially a ventral cord in invertebrates that connects segmental nerve ganglia. Definition of ventral nerve cord. Copyright 2005 1997 1991 by Random House Inc. Courage boldness Ive always wanted to do something like that. Wiktionary 000 0 votes Rate this definition.

Nerve cord definition a single hollow tract of nervous tissue that constitutes the central nervous system of chordates and develops into the spinal cord and brain in vertebrates. The dorsal nerve cord is a hollow cord dorsal to the notochordIt is formed from a part of the ectoderm that rolls forming the hollow tube compared to other animal phyla which have solid ventral tubes. The dorsal nerve cord is one of the embryonic features unique to chordates along with a notochord a post-anal tail and pharyngeal slits. Tell a friend about us add a link to this page or visit the webmasters page for free fun content. A bundle of nerve fibers that carries messages in the form of nerve impulses to or away from the brain and spinal cord. The major cord of nerve fibers running the length of an animals body especially a ventral cord in invertebrates that connects segmental nerve ganglia.

A solid double strand of nerve fibers along the length of the body in elongate invertebrates as earthworms and insects connecting with a pair of nerve ganglia at each body. The nerve cord in the collar region does undergo a sort of neurulation and continues posteriorly as the dorsal nerve cord and anteriorly as nerves that branch out in the proboscis ectoderm. Spine Anatomy Overview Video. Random House Kernerman Websters College Dictionary 2010 K Dictionaries Ltd. A nerve root in the spine is the part of the nerve that branches off from the spinal cord and enters into the intervertebral foramen bony opening between adjacent vertebrae. The dorsal tubular cord of nervous tissue above the notochord of a chordate that comprises or develops into the central nervous system.

A double strand of nerve fibers in elongate invertebrates as earthworms that connects with a pair of nerve ganglia at each body segment. Sensory receptors are specialized endings of nerve fibers that detect information in and around the body. In non-chordate animals such as bilaterians the nerve cord is ventral in the body. From Latin plectere to braid. With muscles controlled by conscious effort voluntary or skeletal muscles and with sensory receptors in the skin. The ventral nerve cord in the trunk is connected to the collar nerve cord by the circumesophageal tract Fig.

Definition of nerve cord 1. The spinal cord consists of bundles of nerve. In humans 12 pairs the cranial nerves are attached to the brain and as a rule 31 pairs the spinal nerves are. A strand of nervous tissue that forms part of the CENTRAL NERVOUS SYSTEM of invertebrates. The dorsal nerve cord is a unique feature to chordates and it is mainly found in the Vertebrata chordate subphylum. This is in contrast to organisms such as annelids and arthropods in which the main nerve cord is ventral.

This is in contrast to organisms such as annelids and arthropods in which the main nerve cord is ventral. In chordates nerve cord is a hollow cord dorsal to the notochord. Nerve in anatomy a glistening white cordlike bundle of fibres surrounded by a sheath that connects the nervous system with other parts of the body. Any of the cordlike bundles of nervous tissue made up of myelinated or unmyelinated nerve fibers and held together by a connective tissue sheath through which sensory stimuli and motor impulses pass between the brain or other parts of the central nervous system and the eyes glands muscles and other parts of the body. Collection of neuron cell bodies located in the peripheral nervous system PNS. A chain of connected segmental ganglia lying against the body wall in the body of an arthropod or annelid.

Want to thank TFD for its existence. Other articles where longitudinal nerve cord is discussed. See all related content. Segments of ganglia are connected through nerve fibers to form the ventral nerve cord. The dorsal nerve cord is only one embryonic feature unique to all chordates among the other four chordate features-- a notochord a post-anal tail an endostyle and pharyngeal slits. Nerve cord in American English.

Bullock 1944 proposed that the nerve. A spinal cord injury SCI is damage to the tight bundle of cells and nerves that sends and receives signals from the brain to and from the rest of the body.

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