Animals Nervous System: Neurons, Central and Peripheral Nervous System

Nervous system, is a structure responsible for controlling the behavior and transmitting signals of continual events across every part of a living body. However, the structure of the nervous system different animals have can vary from one another. The nervous system in animals predominantly incites rapid activities, like locomotion or spontaneous movements. Simply, the nervous system of animals can be dissected into three different parts, the Central Nervous System, Peripheral Nervous System, and Autonomous Nervous System.

Read Also: Human Brain Diagram with Detailed Explanation

Keyterms: Nervous system, Central Nervous System, Peripheral Nervous System, Autonomous Nervous System, Neuron, brain, body, Nerves

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Animal Nervous System

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The Animals' nervous systems generally utilize typical information messengers, simply called neurons, to bind the coordination between several muscle activities. Neurons, also colloquially known as nerve cells, are known to use electrical impulses for transmitting chemical signals across the different parts of the brain. 

An Animal's nervous system is commonly a complex structure that is responsible for sending and receiving chemical signals from around the environment. Typically after detecting the signals, it directly sends it to the brain. 

As mentioned prior, an animal’s nervous system can vary, based on the structural differences of the body. For instance, organisms that do not possess a defined head or tail, can possibly contain a web-like nerve cell dispersed across the different areas of the body. 

However, the organisms that have a visibly defined body can have a classified nervous system, divided into three primary parts: the Central Nervous System, Peripheral Nervous System, and Autonomous Nervous System.

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The Classification of Animals Nervous System

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Animals nervous system can be bifurcated into several parts, namely,

• Central Nervous System: 

This section in an animal’s body typically consists of the brain and the spinal cord. It is situated in the head of an organism and usually draws along the back. The central nervous system confines the brain, forebrain, midbrain, and hindbrain, alongside the spinal cord too. The brain in an organism is generally the largest and the most integral of all functioning areas of the body.

• Peripheral Nervous System: 

This section in an organism mainly contains every individual nerve that is seen to continue from the central nervous system to every part across the body. The nerve fibres of the Peripheral Nervous System usually bind two primary parts, namely, Afferent nerve fibers and Efferent nerve fibres.

• Autonomous Nervous System: 

The Autonomic Nervous System section of an animal's nervous system typically includes sympathetic and parasynthetic nerves. The parasynthetic nerve mainly tethers to distinct, relaxed motions, like the movement and contraction of the pupil. The sympathetic nerve, on the other hand, critically inflames during situations concerning triggers. It involves a motion called, “flight or fight reaction.”

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Parts and Functions of Animals Nervous System

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• Cerebral Cortex: It is responsible to control voluntary movements, the way we reason and perceive different things of interest. It also coordinates the language we speak in.
• Cerebellum: This part of the animal brain is highly responsible in keeping a steady equilibrium in the body. It controls the movement and posture of the body as well.
• Hypothalamus: It typically controls and regulates the temperature of the animal body. Primarily, hypothalamus is also responsible for coordinating sentiments, circadian rhythms and hunger in an organism.
• Medulla Oblongata or Brain Stem: This part of the animal's nervous system is responsible for controlling the heart rate of the body, alongside maintaining a constant equilibrium of breathing and blood pressure. This section of the brain typically consists of pons, medulla, tectum, tegmentum and reticular formation.
• Thalamus: This part of the brain mainly incorporates the motor and sensory information. Following the same, it further ensures directing it to the cerebral cortex. After receiving the information, the cerebral cortex further allows it to reach the different areas of the brain and the spinal cord.
• Limbic System: This section of the brain is typically responsible for coordinating our behavioral and emotional acknowledgment. It generally incorporates the hippocampus, cingulate gyrus and the mammillary bodies. It regulates the behavioral responses that include the needs of feeding or reproduction, and actions relevant to these few.
• Basal Ganglia: This part of the brain is commonly referred to a class of subcortical nuclei that is primarily accountable for motor control. It also generously contributes in other roles too, such as motor learning, emotional stimulus and other executive impetus of the body.
• Midbrain: This part of the brain helps in regulating the vision, locomotion, auditory stimulus and the movement of the eyes in animals' nervous systems.

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Cerebrospinal Nervous System

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The cerebrospinal nervous system in animals conventionally comprises cranial nerves that are evidently seen to connect to the brain for performing certain functions. The functionaries of several of these nerves are outlined beneath,

• Optic – Generating visionary senses.
• Oculomotor – Movement of the Eyeball, pupils and lens.
• Olfactory – Regulates the smell.
• Trochlear – Controlling eye muscles motion.
• Trigeminal – Regulates the nerves of the eyes, jaws, and cheeks.
• Abducens – Abducens nerves are responsible for innervating the lateral rectus muscle.
• Facial – Regulates the facial muscles, salivary glands, and taste sensation.
• Glossopharyngeal – Taste.
• Acoustic – It helps in maintaining balance, and hearing senses.
• Vagus – It helps in innervating for organs situated in the abdomen and the chest
• Spinal Accessory – Movement of the shoulder and head.
• Hypoglossal – Regulating the muscles of the tongue.

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Types of Nerves

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A nerve is quite apparently a combination of innumerable axons that are seen to be bound together. Nerves can be bifurcated into three imperative parts:

Types of Neurons

• Sensory Nerve: 

A sensory nerve, which is also known as the afferent nerve, works when several nerve impulses traverse to the brain or the spinal cord via a receptor. It is known to incorporate predominant somatic afferent nerve fibers.

• Motor Nerve: 

The motor nerve in an animals’ nervous system typically works when the impulse is transmitted via the brain or spinal cord to a specific gland or concerned muscle. This part is commonly taken care of by motor neurons.

• Mixed Neuron: 

A mixed neuron is slightly different from the other two nerves in an animals’ nervous system. Quite clearly, a mixed nerve incorporates both sensory and motor nerves. One instance of the same is spinal nerves.

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Parts of the Nervous System

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The nervous system is commonly dissected into several parts. Every part of the nervous system is responsible for coordinating a procedure and looping it to work. Hence, there are various to name,

• Neuron: A neuron, out of all, is one of the most imperative functional units of the nervous system. A neuron typically is responsible to send or retrieve electrochemical signals. It can be further bifurcated into three crucial parts,
• Cell Body: This part holds the highest significance. It consists of a nucleus, endoplasmic reticulum, mitochondria and ribosomes. Critically, if a cell body stops existing, then the neuron will automatically not survive as well.
• Axon: An axon, or simply a nerve cell is an elongated structure that has a typical shape of a cylinder. It is known to direct the nerve impulses away from the cell body.
• Dendrites: Dendrites are elementally situated on both sides of a neuron. Dendrites basically have a typically branch-like formation projected on either side of a neuron that helps it to connect with the adjoining neuron.

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Points to Remember

1. There are three types of nerves in the animal's nervous system, namely, Sensory nerves, Motor nerves and the Mixed neuron.
2. The animal's nervous system commonly incorporates parts and areas in the body that are known to regulate behavior and transmit chemical signals across different sections of the body.
3. Neurons are known to generate communication between different cells by the help of chemical messengers. However, every part of action evidently occurs in one part of the cell, which is often quite elongated. These are responsible for sending high-speed chemical signals via waves of ionic polarization.
4. The most important parts of the brain are its cerebellum, hypothalamus, medulla oblongata, and limbic system, alongside several others. 
5. The spinal cord is as imperative to understand as are the other parts of the animal's nervous system.

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