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Multinucleate muscle, also known as skeletal muscle, is a type of muscle tissue found throughout the body that is attached to bones via tendons. These muscles are responsible for the voluntary movements of bones and are composed of bundles of muscle fibers called myofibers, which contain several myofibrils. Each myofiber represents a muscle cell, and bundles of myofibers form fascicles, with bundles of fascicles forming muscle tissue. Skeletal muscle fibers are formed from the fusion of myoblasts, resulting in long multinucleated cells.
| Characteristics | Values |
|---|---|
| Type of muscle with multinucleate cells | Skeletal muscle |
| Where is it found | Throughout the body, attached to bones via tendons |
| Cell shape | Long, cylindrical, and thread-like |
| Number of nuclei | More than one |
| Cell size | 10 to 100 micrometers in diameter and many centimeters long |
| Cell membrane | Sarcolemma |
| Cytoplasm | Sarcoplasm |
| Nuclei location | Along the inside of the cell membrane or at the periphery of the cell |
| Nuclei name | Myonuclei |
| Formation | Fusion of myoblasts, each contributing a nucleus |
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What You'll Learn
Skeletal muscle is multinucleated
Skeletal muscle is a type of muscle tissue that is always multinucleated. Each skeletal muscle cell, also known as a muscle fibre, has multiple nuclei located at the periphery of the cell. This multinucleation occurs due to the fusion of myoblasts (muscle precursor cells) during the development process. Myoblast migration is preceded by the formation of connective tissue frameworks, usually formed from the somatic lateral plate mesoderm. Myoblasts follow chemical signals to the appropriate locations, where they fuse into elongated multinucleated skeletal muscle cells.
Skeletal muscle fibres are cylindrical, multinucleated, striated, and under voluntary control. They are long, cylindrical, and striated, ranging from 10 to 100 micrometers in diameter and several centimetres in length. This is thousands of times longer than smooth muscle fibres. The multinucleate condition results embryologically from multiple myoblasts fusing to produce each muscle fibre, with each myoblast contributing one nucleus. The nuclei are usually referred to as myonuclei and are located along the inside of the cell membrane.
Skeletal muscle is found throughout the body, attached to bones via tendons. It is responsible for the voluntary movements of bones. Skeletal muscles are substantially composed of multinucleated contractile muscle fibres (myocytes). Bundles of muscle fibres form fascicles, and bundles of fascicles form muscle tissue. Skeletal muscle is also an endocrine organ, and under different physiological conditions, subsets of 654 different proteins, lipids, amino acids, metabolites, and small RNAs are found in the secretome of skeletal muscles.
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Multinucleated cells contain multiple nuclei
Multinucleated cells, as the name suggests, are cells that contain multiple nuclei. In muscle tissue, these multinucleated cells facilitate the efficient control and distribution of proteins required for muscle contraction. This type of cell is found in skeletal muscles, which are attached to bones via tendons and are responsible for the voluntary movements of bones.
Skeletal muscles are composed of bundles of muscle fibres, or myofibers, which are formed from the fusion of developmental myoblasts in a process known as myogenesis. Each myofiber, representing a muscle cell, contains several myofibrils. Myoblasts are muscle progenitor cells that follow chemical signals to appropriate locations, where they fuse into elongated multinucleated skeletal muscle cells. During myogenesis, each myoblast contributes a nucleus to the newly formed muscle cell, resulting in the multinucleated condition of skeletal muscle fibres. These nuclei, termed myonuclei, are located along the inside of the cell membrane.
The presence of multiple nuclei in skeletal muscle cells serves a functional purpose. Each nucleus regulates the metabolic requirements of the sarcoplasm, the cytoplasm of a muscle cell, around it. This unique cellular structure allows skeletal muscles to efficiently control and distribute the proteins necessary for muscle contraction. The ability to efficiently manage these metabolic processes is essential for skeletal muscles to carry out their function of facilitating voluntary movements.
It is important to distinguish skeletal muscle cells from other types of muscle cells, such as smooth and cardiac muscle cells. Smooth muscle cells are typically found in the walls of hollow organs, including the stomach, intestines, bladder, and uterus, as well as in the eye. They are responsible for involuntary contractions and have a single nucleus. Cardiac muscle cells usually have one nucleus per cell but can occasionally exhibit two nuclei. In contrast, skeletal muscle cells are consistently multinucleated, with multiple nuclei sharing the same cytoplasm.
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Myoblast fusion creates multinucleated cells
Skeletal muscle is a highly organised tissue made up of bundles of muscle fibres called myofibers, which contain several myofibrils. Each myofiber represents a muscle cell, with its basic cellular unit being the sarcomere. Skeletal muscle is found throughout the body, attached to bones via tendons.
Myoblasts are muscle progenitor cells that either remain in the somite to form muscles associated with the vertebral column or migrate out into the body to form all other muscles. Myoblast migration is preceded by the formation of connective tissue frameworks, and myoblasts follow chemical signals to the appropriate locations, where they fuse into elongated multinucleated skeletal muscle cells.
Myoblast fusion is a critical event in myogenesis, during which myoblasts either fuse with one another to generate new multinucleated myofibers or with an existing myofiber, thereby increasing the pool of myonuclei and allowing muscle growth. Myoblast fusion creates multinucleated cells, with each myoblast contributing a nucleus to the newly formed muscle cell or myotube.
The fusion of muscle precursor cells is required for proper skeletal muscle development and regeneration. Myoblast fusion has been studied in cultures of chick embryonic muscle, and in vitro in mammalian myoblasts. The process of myoblast fusion is complex, requiring recognition, adhesion, cell signalling, cytoskeletal alterations, and membrane rearrangements. Numerous proteins and regulatory pathways have been implicated in the recognition, adhesion, and cell signalling phases of myoblast fusion.
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Skeletal muscle is found throughout the body
Skeletal muscle is found throughout the human body and is the most common type of muscle, making up around 40% of body weight in healthy young adults. There are more than 600 skeletal muscles in the human body, and they are part of the voluntary muscular system. They are attached to bones by tendons and are responsible for enabling humans to move and perform daily activities.
Skeletal muscles are substantially composed of multinucleated contractile muscle fibres (myocytes). These multinucleated fibres are formed from the fusion of developmental myoblasts in a process known as myogenesis, resulting in long multinucleated cells. In these cells, the nuclei, termed myonuclei, are located along the inside of the cell membrane. Each muscle fibre represents a muscle cell, and bundles of fibres form fascicles, with bundles of fascicles forming muscle tissue.
Skeletal muscles are derived from the paraxial mesoderm. Mesodermal cells form myogenic cells, which undergo mitosis to form postmitotic myoblasts. These myoblasts then fuse to form multinucleated myotubes. During development, myoblasts either remain in the somite to form muscles associated with the vertebral column or migrate into the body to form all other muscles.
Skeletal muscles play a vital role in everyday activities, including breathing, eating, and moving bones. They also help maintain posture and balance and protect the vital organs in the body. Skeletal muscles also act as a storage source for amino acids and play a central role in maintaining thermostasis and providing energy during starvation.
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Smooth muscle is mononucleated
Skeletal muscles are composed of long, multinucleated muscle fibers, also known as myofibers. Each myofiber represents a muscle cell, and bundles of myofibers form fascicles, which then form muscle tissue. Myoblasts, or muscle progenitor cells, fuse to form multinucleated myotubes, resulting in skeletal muscle fibers. These multinucleated cells range from 10 to 100 micrometers in diameter and can be several centimeters long.
In contrast, smooth muscle cells have a single nucleus and are much shorter, ranging from 30 to 200 micrometers in length. They are spindle-shaped with wide middles and tapering ends. Smooth muscle cells lack myofibrils, sarcomeres, and striations, which are found in skeletal muscle cells. Smooth muscle cells are found in the walls of hollow organs, such as the stomach, intestines, bladder, and uterus, as well as in the walls of blood vessels and in the tracts of the respiratory, urinary, and reproductive systems.
While skeletal muscle fibers are typically associated with multinucleated cells, smooth muscle cells are mononucleated. Smooth muscle cells are specialized for the generation of movement and force in a specific direction and can be isolated or grouped in layers in various tissues. They exhibit fast, rhythmic, spontaneous contractions, contributing to the functionality of the organs and systems in which they are found.
It is worth noting that, while smooth muscle cells are typically mononucleated, there are certain instances where multinucleated smooth muscles have been observed. For example, during the establishment of the male reproductive organs in Drosophila melanogaster, both multinucleated and mononucleated smooth muscles develop. This highlights the plasticity and variability in muscle cell structure, even within the same organism.
In summary, smooth muscle cells are mononucleated, setting them apart from skeletal muscle fibers, which are typically multinucleated. This distinction in cellular structure contributes to the diverse functions and characteristics of the different types of muscle cells in the body.
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Frequently asked questions
Multinucleate muscle, or multinucleate muscle cells, are found in skeletal muscle tissue.
Multinucleate muscle cells are cells that contain more than one nucleus per cell. This occurs during myogenesis when myoblasts fuse, each contributing a nucleus to the newly formed muscle cell.
Skeletal muscle tissue is a type of muscle tissue that is responsible for the voluntary movements of bones. It is found throughout the body, attached to bones via tendons.
Yes, there are three types of muscle tissue: skeletal, smooth, and cardiac. Smooth muscle is mononucleated and is found in the walls of blood vessels and hollow organs such as the gastrointestinal tract, uterus, and bladder. Cardiac muscle cells are also usually mononucleated, but can occasionally have two nuclei.
