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The human body has more than 600 muscles, which are soft tissues that enable movement and support the weight of the body. There are three types of muscle tissue: skeletal, smooth, and cardiac. Skeletal muscles are attached to bones and are under our conscious control, allowing us to perform voluntary movements like lifting a heavy backpack. Smooth muscles, on the other hand, contract and relax involuntarily, helping with essential functions like digestion and urination. Cardiac muscles, as the name suggests, are involved in the functioning of the heart. These muscles work together with the brain and nerves in the neuromuscular system to facilitate movement and support various bodily functions.
| Characteristics | Values |
|---|---|
| Number of muscles in the human body | More than 600 |
| Types of muscles | Skeletal, smooth, cardiac |
| Skeletal muscle fibres | Range from less than 0.5 inches to more than 3 inches in diameter |
| Skeletal muscle contractions | Stimulated by electrical impulses transmitted by motor nerves |
| Smooth muscle contractions | Stimulated by internal pacemaker cells |
| Cardiac muscle contractions | Stimulated by internal pacemaker cells |
| Muscle injuries | Strains, tears, cramps, spasms |
| Muscle conditions | Fibromyalgia, myopathies, myositis, infections, ALS, cardiovascular disease |
| Muscle treatments | RICE method, blood tests, EMG, MRI, ultrasound, muscle biopsy |
| Muscle names | Based on anatomical region, bone attachment, or function |
| Muscle shape | Delta or triangular (deltoids), serrated or saw-like (serratus), rhombus or diamond (rhomboid major) |
| Muscle movement | Voluntary, involuntary |
| Muscle energy | Store and release energy for metabolism |
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Skeletal muscles
Skeletal muscle cells are much longer than other types of muscle tissue and are also known as muscle fibres. The tissue of a skeletal muscle is striated – having a striped appearance due to the arrangement of the sarcomeres. A skeletal muscle contains multiple fascicles – bundles of muscle fibres. Each individual fibre and each muscle is surrounded by a type of connective tissue layer of fascia.
Skeletal muscle fibres are red and white. They are substantially composed of multinucleated contractile muscle fibres (myocytes). Skeletal muscle myocytes are usually very large, being about 2–3 cm long and 100 μm in diameter. By comparison, the mononuclear cells in muscles are much smaller.
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Smooth muscles
The human body has over 600 muscles, and they are responsible for everything from pumping blood around the body to helping us lift heavy objects. One type of muscle found in the body is smooth muscle, which is a type of muscle tissue that works automatically. Smooth muscles are sometimes also called involuntary muscles because they are controlled by the nervous system without conscious thought. Smooth muscles are found throughout the body and are involved in many of the body's automated self-management processes.
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Muscle injuries
Muscle strains can vary in severity, ranging from mild tears that only affect a few fibres to severe tears that require surgery. Acute injuries are typically the result of a single traumatic event, such as a collision in contact sports like rugby or soccer, leading to noticeable symptoms and immediate pain. Chronic injuries, on the other hand, develop over time due to repetitive micro-traumas and may be more challenging to diagnose due to their subtle nature.
Contusions are another type of muscle injury caused by compressive forces, often occurring in contact sports when players collide. Lacerations, bruises, and muscle cramps are also common muscle injuries. Bruises, or haematomas, are caused by internal bleeding into the interstitial tissues, resulting from blunt trauma and physical compression. Muscle cramps, meanwhile, are sudden, involuntary muscle contractions that can be painful.
To treat muscle injuries, the RICE method is often recommended: Rest, Ice, Compression, and Elevation. This helps to reduce swelling, relieve pain, and manage inflammation during the initial days of recovery. Anti-inflammatory medications can also be useful in the first few days. For severe tears, surgery may be required to stitch the muscle back together.
To prevent muscle injuries, it is essential to stretch and warm up before any physical activity. Increasing overall flexibility can also protect muscles from strains and tears. Additionally, maintaining a balanced exercise routine and allowing muscles to rest and rebuild can help prevent overuse and chronic injuries.
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Muscle names
The human body has more than 600 muscles that work to help us lift heavy objects, pump blood around our bodies, and perform both voluntary and involuntary movements. There are three types of muscle tissue in the body: skeletal, smooth, and cardiac. Skeletal muscles are voluntary muscles that work with our bones, tendons, and ligaments to support our weight and move us. They are attached to our skeleton and their names are often based on their shape, size, location, and action. For example, the deltoids are delta or triangular in shape, the serratus muscles are serrated or saw-like in shape, and the rhomboid major is diamond-shaped. The gluteal region contains three muscles differentiated by size: the gluteus maximus (large), gluteus medius (medium), and gluteus minimus (smallest). The direction in which the muscle fibres run can also be used to identify a muscle. For example, the rectus abdominis runs straight up and down, the transverse abdominis runs transversely (left to right), and the obliques run at an angle.
Some muscles are named based on their anatomical location or their relationship to a particular bone. For instance, the frontalis muscle is located on top of the frontal bone of the skull, and the tibialis anterior is named after the anterior portion of the tibia bone that it is attached to. The orbicularis muscle is named after its circular shape. The pectoralis muscle, usually called the pecs, is found on each side of the upper chest and often becomes larger in boys during puberty and in athletes and bodybuilders. The biceps muscle is the muscle we tense when we make a muscle in our arm, and the quadriceps, or quads, are the muscles on the front of the thighs.
The names of muscles can also indicate the number of muscles in a group or how many origins a particular muscle has. For example, the quadriceps are a group of four muscles, and the prefix "bi" in biceps brachii indicates that the muscle has two origins. The location of a muscle's attachment is also often reflected in its name, with the origin named first. The sternocleidomastoid muscle, for instance, has a dual origin on the sternum and clavicle and inserts on the mastoid process of the temporal bone.
The etymology of muscle names is often rooted in Latin and Greek terminology, reflecting the history of anatomical study in Western culture. Understanding the etymology of muscle names can help us to identify where the muscles are located and what they do.
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Muscle shape
The human body has over 600 muscles, which can be classified into three types: skeletal, cardiac, and smooth muscle. Skeletal muscles are the most common type of muscle in the body, comprising 30% to 40% of total body mass. They are attached to bones by tendons and help with movement and functions like chewing and swallowing. These muscles vary in shape and size, with their form generally depending on their fascicular architecture and fiber length. For example, the gluteal muscles have numerous thick, short fascicles, while the sartorius muscle has longer, slender fascicles.
Skeletal muscles can be further classified into four basic structural patterns: circular, parallel, convergent, and pennate. Circular muscles are arranged in concentric rings and surround external body openings like the eyes and mouth. Convergent muscles, also known as triangular or fan-shaped muscles, have a broad origin with fascicles converging towards a single tendon of insertion. An example of a convergent muscle is the pectoralis major in the anterior thorax. Parallel muscles have fascicles that run along the long axis of the muscle, with variations seen in fusiform, strap, and convergent muscles.
Pennate muscles are characterized by short fascicles that attach obliquely to a central tendon. They come in three forms: unipennate, bipennate, and multipennate. An example of a bipennate muscle is the rectus femoris of the thigh, while the deltoid muscle, which forms the roundness of the shoulder, is an example of a multipennate muscle.
Cardiac muscles, on the other hand, are located in the walls of the heart and are under involuntary control. Smooth muscles are found in the walls of hollow organs and tubular structures, and they modify the diameter or size of these structures. Smooth muscle cells are smaller and shorter than skeletal muscle cells and are typically spindle-shaped.
The shape and size of muscles play a crucial role in their function and allow them to perform a wide range of tasks effectively.
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Frequently asked questions
There are over 600 muscles in the human body.
There are three types of muscles: skeletal, smooth, and cardiac. Skeletal muscles are voluntary muscles that support movement. Smooth muscles are involuntary muscles that are usually found in sheets or layers. Cardiac muscles contract involuntarily.
Some examples of skeletal muscles include the pectoralis (pecs), rectus abdominus (abs), biceps, and quadriceps (quads).
Muscles work by contracting and relaxing to cause movement. Skeletal muscles contract voluntarily under the influence of the central nervous system. Smooth and cardiac muscles contract involuntarily, stimulated by internal pacemaker cells.
