Alec Titan
The human body is in constant motion, even when we think we are still. The muscular system is responsible for the movement of the human body, with about 700 named muscles making up roughly half of a person's body weight. 3D muscle modelling has been used to reconstruct the muscles of extinct animals and is also being used to develop 3D bioprinted human skeletal muscle constructs for muscle function restoration. 3D muscle animations are also being used to teach people about the muscles of the human body.
| Characteristics | Values |
|---|---|
| Definition | The 3D muscle modelling is a method to predict appendicular muscle parameters for extinct taxa that take their individual limb morphology into account. |
| Challenges | The exact maximal 3D extents of muscle boundaries are unknown and, therefore, might be based on flawed assumptions. |
| Benefits | 3D muscle modelling can be used to reconstruct the complete pelvic and hindlimb musculature of a Mesozoic reptile. |
| Use cases | 3D muscle modelling can be used to estimate the LoAs of the gorilla shoulder. |
| Use cases | 3D muscle modelling can be used to reconstruct 3D musculature in extinct animals. |
| Use cases | 3D bioprinted skeletal muscle can be used to treat extensive skeletal muscle defects. |
| Use cases | 3D bioprinted skeletal muscle can be used for muscle function restoration. |
| Muscular system | The muscular system is responsible for the movement of the human body. |
| Muscles | There are about 700 named muscles that make up roughly half of a person's body weight. |
| Muscle tissue | There are three types of muscle tissue: visceral, cardiac, and skeletal. |
| Visceral muscle | Visceral muscle is found inside organs like the stomach, intestines, and blood vessels. It is the weakest of all muscle tissues and is controlled by the unconscious part of the brain. |
| Cardiac muscle | Cardiac muscle is found only in the heart and is responsible for pumping blood throughout the body. It is an involuntary muscle that cannot be controlled consciously. |
| Skeletal muscle | Skeletal muscles rarely work alone and often work in groups to produce precise movements. |
| Muscle names | Many muscles derive their names from their anatomical region or the bone they are attached to. |
| Muscle actions | Common muscle actions include wrist extension, horizontal shoulder adduction, and knee flexion. |
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What You'll Learn
Muscle modelling
One of the primary challenges in muscle modelling is the intricate nature of muscle tissue. Muscle tissue is anisotropic, highly nonlinear, and quasi-compressible. It undergoes large deformations and has complex shapes and interactions with surrounding tissues. To address this, researchers employ finite-element modelling, which is a powerful tool for understanding muscle mechanics. However, even within finite-element modelling, there are challenges. For instance, deciding on the dimensionality of the model—whether to use a two-dimensional or three-dimensional representation—depends on the specific muscle and context. While two-dimensional models are computationally less expensive, they often fail to capture the complex nature of muscles.
Another critical aspect of muscle modelling is the accurate estimation of muscle parameters such as muscle masses and lines of action. These parameters are crucial for understanding force production and moment arms. In living organisms, these parameters are often obtained through destructive techniques like dissection, which can be limiting. Therefore, researchers have developed new protocols that facilitate the estimation of missing muscle parameters, such as muscle volume and path, by creating three-dimensional volumetric reconstructions.
Polygonal modelling is a technique that allows for the adjustment of individual vertices, enabling the modelling of muscles with complex geometries, such as those with multiple heads or tendons. This approach also allows for quick adjustments and smoothing to enhance the realism and precision of the reconstruction. Mathematical models, such as cross-bridge dynamics and phenomenological models, are also employed to represent entire human muscles and predict muscle forces under different conditions.
The applications of muscle modelling are vast, ranging from understanding the basic mechanics of muscle movement to exploring the functional effects of muscle geometry in various parts of the body, including the eye, mouth, face, tongue, and pelvic floor muscles. By advancing the technical treatment of 3D models and continuing to ask key questions, the field of muscle modelling aims to provide novel insights that are broadly applicable in muscle physiology, biomechanics, and clinical settings.
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Muscle tissue regeneration
The human body contains about 700 named muscles, which make up roughly half of a person's body weight. Each of these muscles is a discrete organ constructed of skeletal muscle tissue, blood vessels, tendons, and nerves. There are three types of muscle tissue: visceral, cardiac, and skeletal.
Visceral muscle, also known as smooth muscle, is the weakest type of muscle tissue and is found inside organs like the stomach, intestines, and blood vessels. It contracts to move substances through the organ and is controlled by the unconscious part of the brain, making it an involuntary muscle.
Cardiac muscle, on the other hand, is found only in the heart and is responsible for pumping blood throughout the body. Cardiac muscle tissue also cannot be controlled consciously, making it an involuntary muscle as well.
Skeletal muscle contains numerous 'satellite cells' underneath the basal lamina, which are mononucleated quiescent cells. When skeletal muscle is damaged, these satellite cells are stimulated to divide and fuse with existing muscle fibres to regenerate and repair the damage. This process of muscle regeneration can be divided into several stages: necrosis of the injured muscle cell, activation of muscle stem cells, proliferation of these activated stem cells, differentiation of the stem cells, maturation of the newly formed muscle fibres, and remodelling of muscle fibres.
Acute inflammation and immune cells play critical roles in almost all stages of muscle regeneration. At the early stages of muscle regeneration, injured muscle cells undergo necrosis, and the cellular contents and chemotactic factors are released into the extracellular space, inducing the infiltration of immune cells such as mast cells and neutrophils. These immune cells help clear the damaged myofibres at the injury site and trigger a cascade of cellular responses to regulate muscle stem cell activation, proliferation, and differentiation.
Regulatory T cells (Treg) are another important player in muscle regeneration, regulating the inflammatory infiltrate at the site of tissue damage. Studies on Treg-deficient mice have shown that these cells are closely related to regenerating fibres during muscle repair and can influence the behaviour of satellite cells.
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Muscle movement
The human body is in constant motion, even when we think we are still. Our muscles are always working, from the cardiac muscle that is our heart, beating, to the muscles in our digestive tract, and those that facilitate respiration.
The muscular system is responsible for the movement of the human body. There are around 700 named muscles, making up about half of a person's body weight. Each muscle is a discrete organ, constructed of skeletal muscle tissue, blood vessels, tendons, and nerves. The skeletal muscle tissue is also found in the heart, digestive organs, and blood vessels, where it moves substances through the body. There are three types of muscle tissue: visceral, cardiac, and skeletal.
Visceral muscle is found inside organs like the stomach and intestines, and is the weakest of all muscle tissues. It is controlled by the unconscious part of the brain and is, therefore, an involuntary muscle. Cardiac muscle, on the other hand, is autorhythmic or intrinsically controlled. It stimulates itself to contract, pumping blood throughout the body.
Skeletal muscles rarely work alone, instead working in groups to produce precise movements. The muscle that produces a particular movement is called an agonist or prime mover, and it pairs with an antagonist muscle that produces the opposite effect. For example, the biceps brachii muscle flexes the arm at the elbow. When you flex your knee, many muscles are involved, including the gastrocnemius, biceps femoris, and gracilis, among others.
Recent advancements in technology have enabled the development of 3D bioprinted skeletal muscle constructs, which have the potential to be used for muscle function restoration and reconstruction in the case of trauma or tumour ablation.
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Muscle names and locations
The human body has more than 600 muscles, which help us do everything from moving our bodies to breathing and staying alive. These muscles are classified based on the type of tissue they are made of, i.e., visceral, cardiac, and skeletal.
Visceral muscle, also known as smooth muscle due to its smooth appearance under a microscope, is found inside organs like the stomach, intestines, and blood vessels. It is the weakest of all muscle tissues and is controlled by the unconscious part of the brain, making it an involuntary muscle.
Cardiac muscle is found only in the heart and is responsible for pumping blood throughout the body. It cannot be controlled consciously, making it another type of involuntary muscle.
Skeletal muscle, on the other hand, is the only voluntary muscle tissue in the human body. It is controlled consciously and is responsible for physical actions such as speaking, walking, or writing. Most skeletal muscles are attached to two bones across a joint and work in groups to produce precise movements.
Some examples of skeletal muscles and their locations include:
- The biceps brachii muscle, which flexes the arm at the elbow
- The supinator, which supinates the wrist by rolling it over to face palm up
- The rectus abdominis and transverse abdominis, which are found in the abdominal region
- The tibialis anterior, which is named after the anterior portion of the tibia bone that it is attached to
- The sternocleidomastoid, which connects the sternum and clavicle to the mastoid process of the skull
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Muscle contractions
The human body is a complex machine, with muscles that are constantly contracting, even when we think we are still. The muscular system is responsible for the movement of the human body. There are about 700 named muscles in the human body, making up about half of a person's body weight. These muscles are attached to the bones of the skeletal system and work in groups to produce precise movements.
Muscle contraction is the activation of tension-generating sites within muscle cells. It is a complex process, known as excitation-contraction coupling, which begins when an action potential causes depolarization in the myocyte membrane. This action potential is an impulse generated by the nervous system, which travels through a type of nerve cell called a motor neuron. The neuromuscular junction is where the motor neuron reaches a muscle cell. When the nervous system signal reaches the neuromuscular junction, a chemical message is released by the motor neuron. This message is a neurotransmitter called acetylcholine, which binds to receptors on the outside of the muscle fiber, starting a chemical reaction within the muscle.
When acetylcholine reaches the receptors, membrane channels open, allowing an influx of sodium ions into the muscle fiber cytoplasm. This triggers the release of stored calcium ions, which diffuse into the muscle fiber. The relationship between the chains of proteins within the muscle cells changes, leading to the contraction. The contraction occurs when the protein filaments within each skeletal muscle fiber slide past each other.
The process of muscle contraction can be broken down into three steps. Firstly, a message travels from the nervous system to the muscular system, triggering chemical reactions. Secondly, the chemical reactions lead to the muscle fibers reorganizing themselves in a way that shortens the muscle, resulting in a contraction. Finally, when the nervous system signal stops, the chemical process reverses, the muscle fibers rearrange, and the muscle relaxes.
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Frequently asked questions
3D Muscle is a way of representing the muscles of the human body in three dimensions, often using animations.
Learning about 3D Muscle can help you understand the complexity of the human body and how muscles work together to produce movement.
Common muscle actions such as wrist extension, finger flexion, and horizontal shoulder adduction can be visualised and understood through 3D Muscle animations.
3D Muscle is an important tool for studying kinesiology, which is the scientific study of human movement. By understanding the 3D structure and function of muscles, we can better comprehend how the body moves and how to optimise our physical performance.
3D Muscle modelling has various applications, including in the field of reconstructive surgery, where it can be used to repair extensive skeletal muscle defects and restore normal tissue function. It is also used in biomechanical analyses and to study the musculature of extinct animals.
