Difference Between Nerve and Vein

Key Difference – Nerve vs Vein

Our body has networks that are responsible for transporting certain things from one place to another. Although these components have the similar purpose in the biological system, their structures are different due to their variable functions. Nerves and veins are two components of such networks that transport nerve impulses and blood respectively. Thekey difference between nerve and vein is that the network of thenervous systemis made by nerves while that of thecirculatory systemis composed of veins. There are other differences too between nerve and vein in terms of their structure, functions, etc., which are discussed here in detail.

What is a Nerve?

A nerve ismade up of several thousand nerve fibers enclosed in a connective outer sheath. Nerves are connected via nerve cells known asneurons. A nerve fiber is either a longaxon or dendriteof a neuron. Depending on the presence or absence of myelin sheath, there are two types of nerve fibers; namely, myelinated nerve fibers and nonmyelinated nerve fibers. Nerves transfer electro-chemical signals throughout the nerve network and is responsible for sensory actions/responses in the body. Not all nerves are interconnected. Nerve network starts mainly from the brain and脊髓. Based on the nature of nerve impulse, nerves are divided into three types;sensory nerves, motor nerves,andmixed nerves.

Sensory nerves are composed of only sensory nerve fibers and conduct nerve impulses from peripheral tissues to thecentral nervous systemin order to produce sensation. Motor neurons contain only motor fibers and are responsible for conducting nerve impulses from central nervous system to muscles or glands. Mixed nerves contain both sensory and motor nerve fibers, and carry out sensory and motor functions.

What is a Vein?

Veins aretube-like structures that carry blood towards the heart from all over the body. Unlike the nervous system, the human circulatory system is a closed network and all the veins are interconnected. Main veins found in the human body includejugular vein, renal vein, subclavian vein, hepatic portal vein, and femoral vein. Most veins carry deoxygenated blood with the exception of thepulmonary veinand umbilical vein.

The wall of the veins are less muscular and often found closer to the skin. Generally, the outermost wall of the vein is composed of connective tissue, calledtunica adventitia. The middle layer is called tunica media, which contains smooth muscle. The inner layer is called tunica intima. Unlike thearteries, most veins have a lot of anatomical variations. Some veins have valves that prevent regurgitation.

What is the difference between Nerve and Vein?

Connected System:

Nerve:Nerves make the nerve net of the nervous system.

Vein:静脉静脉系统的循环系统stem.

Structure:

Nerve:Nerves are made up of axons and dendrites.

Vein:Veins are made up of outer tunica adventitia, middle tunica media, and inner tunica intima.

Function:

Nerve:Nerves are important to carry out sensory functions.

Vein:Veins carry deoxygenated blood towards the heart.

Material Transported:

Nerve:Nerves transport electrochemical pulses.

Vein:Veins transport deoxygenated blood.

Interconnection:

Nerve:Most nerves are not interconnected.

Vein:All veins are interconnected.

图片由:

1. Nervous SystembyCFCF(CC BY 3.0)
2. Venous Systemvia Wikicommons (Public Domain)