Asked by: Naual Douiri
medical health bone and joint conditions

What does plexus mean in anatomy?

Last Updated: 27th March, 2020

Medical Definition of Plexus
In medicine, a network or tangle of lymphatic vessels, nerves, or veins. For example, the brachial plexus is a network of nerves leading to the arm. In general, any interwoven entity made up of elements in a structure or system.

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Also question is, what is a plexus in anatomy?

FMA. 5901. Anatomical terms of neuroanatomy. A nerve plexus is a plexus (branching network) of intersecting nerves. A nerve plexus is composed of afferent and efferent fibers that arise from the merging of the anterior rami of spinal nerves and blood vessels.

Beside above, what is plexus in biology? A plexus (from the Latin for "braid") is a branching network of vessels or nerves. The vessels may be blood vessels (veins, capillaries) or lymphatic vessels. The nerves are typically axons outside the central nervous system.

Likewise, what are the plexuses in the body?

Spinal Plexuses

  • Cervical Plexus—Serves the Head, Neck and Shoulders.
  • Brachial Plexus—Serves the Chest, Shoulders, Arms and Hands.
  • Lumbar Plexus—Serves the Back, Abdomen, Groin, Thighs, Knees, and Calves.
  • Sacral Plexus—Serves the Pelvis, Buttocks, Genitals, Thighs, Calves, and Feet.

Why do we have Plexuses?

What is the function of a plexus (nervous system)? But by forming plexus the same nerve have different root spinal nerves so damage to one or two nerves will not lead to complete paralysis of the muscle it supplies.

Related Question Answers

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What are Rami?

rami) (Latin for branch) is the anterior division of a spinal nerve. The ventral rami supply the antero-lateral parts of the trunk and the limbs. They are mainly larger than the dorsal rami.

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How is a plexus formed?

It begins in the root of the neck, passes through the axilla, and runs through the entire upper extremity. The plexus is formed by the anterior rami (divisions) of cervical spinal nerves C5, C6, C7 and C8, and the first thoracic spinal nerve, T1.

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What are the 8 cervical nerves?

Although there are seven cervical vertebrae (C1-C7), there are eight cervical nerves C1–C8. All cervical nerves except C8 emerge above their corresponding vertebrae, while the C8 nerve emerges below the C7 vertebra. Elsewhere in the spine, the nerve emerges below the vertebra with the same name.

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What are the 31 spinal nerves?

Spinal nerve, in vertebrates, any one of many paired peripheral nerves that arise from the spinal cord. In humans there are 31 pairs: 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 1 coccygeal. Each pair connects the spinal cord with a specific region of the body.

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How can you tell cadaver brachial plexus?

A common structure used to identify part of the brachial plexus in cadaver dissections is the M or W shape made by the musculocutaneous nerve, lateral cord, median nerve, medial cord, and ulnar nerve.

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What part of the spine controls the legs?

The thoracic vertebrae are situated between the cervical (neck) vertebrae and the lumbar vertebrae. These thoracic vertebrae provide attachment for the ribs and make up part of the back of the thorax or chest. Damage or SCI's above the T1 vertebra affects the arms and the legs.

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Who invented plexus?

The Plexus Story
Two of Plexus' owners got their start in the industry as distributors—Plexus' International President Alfred Pettersen and CEO Tarl Robinson. Pettersen joined his first direct sales company in 1992. Soon he became one of the company's top distributors in his home country of Canada.

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What is the visceral nervous system?

Alternative Titles: ANS, vegetative nervous system, visceral nervous system. Autonomic nervous system, in vertebrates, the part of the nervous system that controls and regulates the internal organs without any conscious recognition or effort by the organism.

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What is nerve root and plexus disorder?

Nerve, nerve root and plexus disorders are some of the most common neurological diseases, sharing symptoms with such conditions as lower back pain. Brachial plexus disorder affects the arms and hands. Lumbosacral plexus disorder affects the posterior thigh, most of the lower leg and foot and part of the pelvis.

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Where are Plexuses located?

Sacral Plexus—Serves the Pelvis, Buttocks, Genitals, Thighs, Calves, and Feet. The sacral plexus is formed by the ventral rami of L4-S3, with parts of the L4 and S4 spinal nerves. It is located on the posterior wall of the pelvic cavity.

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What is a mixed nerve?

A mixed nerve is a nerve that contains both afferent and efferent nerves. Therefore, mixed nerves function to transmit both sensory and motor

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What nerves control what?

The peripheral nervous system is a network of 43 pairs of motor and sensory nerves that connect the brain and spinal cord (the central nervous system) to the entire human body. These nerves control the functions of sensation, movement and motor coordination. They are fragile and can be damaged easily.

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What nerves does t12 control?

Thoracic Spinal Nerves. The thoracic spine has 12 nerve roots (T1 to T12) on each side of the spine that branch from the spinal cord and control motor and sensory signals mostly for the upper back, chest, and abdomen.

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What is the brachial plexus?

The brachial plexus is the network of nerves that sends signals from your spinal cord to your shoulder, arm and hand. A brachial plexus injury occurs when these nerves are stretched, compressed, or in the most serious cases, ripped apart or torn away from the spinal cord.

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What are the three branches given off by a spinal nerve?

Branches: The spinal nerves branch into the dorsal ramus, ventral ramus, the meningeal branches, and the rami communicantes.

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What is the difference between the dorsal and ventral roots of the spinal cord?

The difference between the dorsal and ventral roots of the spinal nerves are the sensory nerve fibers enter the spinal cord through the dorsal root while the motor nerves exit through the ventral root. sensory neurons enter through the dorsal root into the gray matter of the spinal cord.

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What is the plural of Plexus?

Plexus was one of those Latin words that was both singular and plural, and at some point somebody decided to shift to plexuses. R Plexi is incorrect. The plural for plexus is either plexus or plexuses.

Iftikhar Kabakoff


Which Plexus has the greatest distribution?

Structure and Distribution
Nerves of the lumbar plexus serve the skin and the muscles of the lower abdominal wall, the thigh, and external genitals. The largest nerve of the plexus is the femoral nerve and it supplies the anterior muscles of the thigh and a part of skin distal to the inguinal ligament.

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What is a benefit of a nerve plexus?

what is a benefit of a nerve plexus? they provide a straight path from the spinal cord to target muscles. the dorsal ramus can be distributed to many areas. a plexus does not allow for redistribution.