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Definition of extrinsic muscles

by Alivia Nyhan
Published: Last Updated on

The human body is a perfectly designed machinery so that we can make a great variety of movements. Still, to achieve them, a great variety of structures and tissues, muscles, tendons, joints, bones, and cartilage intervene to provide the body with the possibility to perform countless actions.

To carry out the wide range of movements that we are capable of, great complexity of muscles and highly specialized organic elements are required. The Definition of extrinsic muscles is the following, they are all those muscles that are outside the organ they control, and these are one of the types of muscles that make up all this complexity.

Thanks to the following article by FastlyHealyou will be able to understand more about what extrinsic muscles are and how they work.

Extrinsic muscles of the eye

Below, we will detail a series of extrinsic muscles that are part of different body structures so that you can better understand what they are and what they are for.

The extrinsic muscles of the eyeball are the paradigmatic example of this type of musculature. As we have explained previously, they are related to the eyeball and allow its movement but are located outside its structure.

This voluntary structure comprises six different muscles, two oblique and four straight, which are located inside the ocular orbit, taking care of the movement of the globe and directing the gaze.

These originate in the tendinous annulus known as the ring of Zinn, and when combined, they facilitate the vertical, lateral, and rotational movements that the eyeball makes. Generally, the movement of both eyes is coordinated so that the work of the muscles of the two eyes coincides, this phenomenon is known as the conjugate gaze, and its objective is that the image that is transferred to the brain is unique.

Extrinsic muscles of the tongue

These muscles attach to the tongue even though they originate from structures outside the language. The tongue has a great variety of movements necessary for it to carry out its functions correctly. The entry of food, its manipulation in the oral cavity, the articulation of words, and part of the swallowing can be given thanks to the enormous talent that we have of our tongue, a skill impossible to have if it were not for the movements that we can do with it, such as propulsion, retraction, depression, and elevation.

Extrinsic laryngeal muscles

The larynx muscles, responsible for various movements, can be ranked between extrinsic and intrinsic. The intrinsic ones, which have their origin in the larynx itself and, therefore, have their two intersections in it, are those that produce the movements of the vocal cords, essential for making sounds and being able to speak.

The irrelevant, which have at least one of their two intersections outside the larynx, are those that allow all other movements, such as swallowing, and the fixation of this organ that is the gateway to the lower respiratory tract.

Extrinsic foot muscles

The feet are the foundation of the body; its anatomy and shape depend on the rest of the organism’s ability to sustain itself and move, although it would be wrong to attribute all the credit to them. Its operation is not autonomous or isolated but works together with the ankles and parts of the leg such as the fibula and the tibia to not lose the upright position and displace the whole body harmonically.

In this sense, the extrinsic muscles of the foot act, which are born in other structures of the body and intersect in it to be able to keep together and interpenetrate this anatomical structure responsible for our balance and displacement.

An essential part of the pathologies, conditions and other problems that occur in the fingers and forefoot are attributed to the poor functioning of these muscles.

This article is merely informative, at FastlyHeal .com we do not have the power to prescribe medical treatments or make any diagnosis. We invite you to see a doctor in the case of presenting any condition or discomfort.

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