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The human body has over 600 muscles, which are responsible for movement and performing various functions. Each muscle is made up of thousands of elastic fibres bundled together, forming a discrete organ. These fibres are surrounded by a thin membrane called the perimysium, and each fibre is surrounded by a layer of connective tissue called the endomysium. The endomysium, in turn, is enclosed within another layer of connective tissue called the epimysium, which separates individual muscles and forms tendons that attach muscles to bones.
| Characteristics | Values |
|---|---|
| Number of muscles in the human body | 600-700 |
| Types of muscles | Skeletal, Smooth, Cardiac |
| Skeletal muscle composition | Skeletal muscle tissue, blood vessels, tendons, nerves |
| Skeletal muscle shape | Spindle, Flat, Triangular, Circular |
| Skeletal muscle fibres | Actin and myosin filaments called myofilaments |
| Skeletal muscle fibre composition | Myofibrils, proteins (myoglobin), molecules to provide oxygen and energy |
| Skeletal muscle fibre covering | Connective tissue called endomysium |
| Skeletal muscle fibre bundles | Fasciculus, surrounded by perimysium |
| Skeletal muscle covering | Connective tissue called epimysium |
| Muscle fibre types | Type I (slow), Type II (fast) |
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Connective tissue called endomysium
The human body is composed of more than 600 muscles, which help us perform a variety of functions, from moving our bodies to breathing and keeping us alive. Each muscle is made up of multiple tissues, including blood vessels, lymphatics, contractile muscle fibres, and connective tissue sheaths.
Connective tissue is present in all muscles as deep fascia, which separates groups of muscles into muscle compartments. Deep fascia has specialised functions within muscles, enclosing each muscle fibre as endomysium, each muscle fascicle as perimysium, and each individual muscle as epimysium.
Endomysium is the innermost sheath of connective tissue that surrounds each individual muscle fibre. It is a thin layer of connective tissue that surrounds and separates each muscle fibre within a fascicle. Each fascicle, or bundle of muscle fibres, is surrounded by a layer of connective tissue called perimysium, and multiple fascicles together form a muscle, which is surrounded by the outermost layer of connective tissue, the epimysium.
The endomysium is an important component of skeletal muscle, which is one of the three significant muscle tissues in the human body. Skeletal muscles are attached to bones by tendons and are responsible for producing body movements. The endomysium surrounds the muscle fibres, which are formed from the fusion of developmental myoblasts in a process called myogenesis, resulting in long multinucleated cells.
The endomysium also plays a role in muscle fibre metabolism and resistance, and its structure and function have been studied in detail. Blood vessels also play a role in muscle function, with the primary artery supplying blood to a skeletal muscle running parallel to the longitudinal axis of the muscle fibre. The terminal arterioles, the final vascular branches, perfuse the capillaries present within the endomysium, supplying blood to the muscle fibres.
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Tendons
The human body is composed of about 600 muscles, which are responsible for movement. These muscles are made up of skeletal, smooth, and cardiac muscle tissue. Skeletal muscles are the most common type of muscle in the body and are attached to bones to enable movement.
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Muscle fibres
The human body contains more than 600 muscles, which are made up of thousands of small muscle fibres woven together. These fibres stretching and pressing together is what moves your organs and body. Each muscle fibre consists of a single muscle cell. When grouped together, they facilitate the organised movement of limbs and tissues.
There are three types of muscle fibres: slow oxidative (SO), fast oxidative (FO), and fast glycolytic (FG). Most skeletal muscles contain all three types, although in varying proportions. Type 1 fibres have a higher density of energy-generating organelles called mitochondria, which makes them dark. Type 2A fibres can also use oxygen to generate energy, but they contain fewer mitochondria, making them lighter. Type 2B fibres don't use oxygen to generate energy; instead, they store energy for short bursts of movement and appear white.
People who perform well in endurance sports tend to have a higher number of slow-twitch fibres, while sprinters tend to have a higher number of fast-twitch fibres. Both types of fibres can be influenced by training. For example, sprint training can improve the power generated by slow-twitch fibres, and endurance training can increase the endurance level of fast-twitch fibres.
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Muscle shape
The human body is composed of around 600 muscles, which are made up of thousands of small fibres woven together. These fibres are bundled tightly together, and each bundle is wrapped in a thin membrane called the perimysium. The innermost layer surrounding individual muscle fibres is called the endomysium, while the outermost layer is the epimysium. These layers of connective tissue separate groups of muscles into compartments.
Skeletal muscles, which are the most common type of muscle in the body, come in four main shapes:
- Spindle: wide through the middle and tapering at both ends, such as the biceps.
- Flat: like a sheet, such as the diaphragm that separates the chest from the abdominal cavity.
- Triangular: wider at the bottom and tapered at the top, such as the deltoid muscles of the shoulder.
- Circular: a ring shape like a doughnut, such as the muscles that surround the mouth, pupils and anus.
The fibres in pennate muscles run at an angle to the axis of force generation, which reduces the effective force of any individual fibre. However, this angle allows for more fibres to be packed into the same muscle volume, increasing the physiological cross-sectional area (PCSA). This effect is known as fibre packing.
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Muscle type
There are about 600 muscles in the human body, which can be broadly classified into three types: skeletal, smooth, and cardiac. These muscles are made up of thousands of elastic fibres bundled tightly together, with each bundle wrapped in a thin transparent membrane called a perimysium.
Skeletal Muscle
Skeletal muscles are the most common type of muscle in the human body, comprising 30% to 40% of total body mass. They are attached to bones and allow movement, and are also known as voluntary muscles as they are under conscious control. Skeletal muscles come in four main shapes: spindle, flat, triangular, and circular. They are also referred to as striated muscles due to their striped appearance under a microscope. Each skeletal muscle fibre is a single cylindrical muscle cell, and a single muscle may be made up of hundreds or thousands of muscle fibres bundled together. Skeletal muscles contain multiple fascicles, or bundles of muscle fibres, and are surrounded by a connective tissue layer of fascia.
Smooth Muscle
Smooth muscle is located in various internal structures, including the digestive tract, uterus, and blood vessels such as arteries. It is also known as involuntary muscle, as its motion happens without conscious awareness. Smooth muscle is arranged in layered sheets that contract in waves along the length of the structure, giving it a smooth, uniform appearance under a microscope.
Cardiac Muscle
Cardiac muscle is only found in the heart and is responsible for pumping blood throughout the body. It is an involuntary muscle, as it cannot be controlled consciously. Cardiac muscle tissue stimulates itself to contract and is considered to be intrinsically controlled. Under a microscope, cardiac muscle tissue appears striated, with light and dark stripes.
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Frequently asked questions
Muscles are made of thousands of small elastic fibres bundled tightly together. Each bundle is wrapped in a thin transparent membrane called a perimysium.
Each individual muscle is surrounded by a connective tissue sheath called the epimysium. Fascia, the connective tissue outside the epimysium, surrounds and separates the muscles.
There are three types of muscles in the human body: skeletal, cardiac, and smooth muscle.
Muscles have a range of functions from pumping blood and supporting movement to lifting heavy weights or giving birth.
Skeletal muscles are the most common type of muscle in the human body.
