Dominic Stone
There are several types of skeletal muscles, including parallel, circular, convergent, and pennate muscles. Parallel muscles are typically long and thin and do not have much strength. They are the most abundant and typical type of muscle, with fascicles arranged parallel to one another. Parallel muscles can be further categorized into three groups: strap, fusiform, or fan-shaped. An example of a parallel muscle is the sartorius muscle, which runs down the thigh to the knee.
| Characteristics | Values |
|---|---|
| Muscle architecture | Parallel |
| Muscle shape | Long and thin |
| Muscle strength | Not much strength |
| Muscle fibres | Parallel to each other |
| Muscle fibre length | Shorter than pennate muscles |
| Muscle force | Less force than pennate muscles |
| Muscle function | Fast or extensive movements |
| Muscle categories | Strap, fusiform, or fan-shaped |
| Muscle examples | Sartorius, biceps brachii, psoas major |
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What You'll Learn
- Parallel muscles are long and thin and don't have much strength
- Parallel muscles are the most abundant and typical muscle type
- Parallel muscles are further categorised into strap, fusiform, or fan-shaped
- Parallel muscles have a common point of attachment, with fascicles running parallel to each other
- Parallel muscles are one of the three main types of muscle architecture
Parallel muscles are long and thin and don't have much strength
Parallel muscles are a type of skeletal muscle, which are voluntary muscles that surround and support our skeleton and move our bones. They are typically long and thin and do not have much strength. This is because they possess a smaller amount of muscle fibres than similarly-sized pennate muscles, which are at an angle to the force-generating axis and usually insert into a central tendon, allowing for more fibres to be present in a given muscle.
Parallel muscles are the most abundant and typical type of muscle, with fascicles arranged parallel to one another. They can be further defined into three main categories: strap, fusiform, or fan-shaped. Strap muscles are shaped like a strap or belt and have fibres that run longitudinally to the contraction direction. An example of a strap muscle is the sartorius, which is the longest muscle in the human body. Fusiform muscles are wider and cylindrically shaped in the centre and taper off at the ends, like a spindle. An example of a fusiform muscle is the biceps brachii.
The force produced by a given muscle is proportional to the cross-sectional area, or the number of parallel sarcomeres present. The force produced by pennate muscles is greater than the force produced by parallel muscles. However, despite having fewer muscle fibres, parallel muscles have a greater range of motion than pennate muscles.
Parallel muscles are often used for fast or extensive movements and can be measured by the anatomical cross-sectional area (ACSA). They have broad attachments compared to other muscle types and can shorten to about 40–60% of their resting length.
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Parallel muscles are the most abundant and typical muscle type
Parallel muscles have a common point of attachment, with fascicles running parallel to each other. They are one of the two main types of muscle architecture, the other being pennate (or pinnate). The force produced by a given muscle is proportional to the cross-sectional area or the number of parallel sarcomeres present. In pennate muscles, the fibres are at an angle to the force-generating axis, which results in a shorter fibre length. This structure allows for more fibres to be present in a given muscle, and pennate muscles generate greater tension than similarly-sized parallel muscles. However, the trade-off is between the number of fibres present and force transmission. Parallel muscles are often used for fast or extensive movements and can be measured by the anatomical cross-sectional area.
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Parallel muscles are further categorised into strap, fusiform, or fan-shaped
Parallel muscles are those where the fibres are parallel to the force-generating axis. They are characterised by fascicles that run parallel to one another, and the contraction of these muscle groups acts as an extension of the contraction of a single muscle fibre. Most skeletal muscles in the body are parallel muscles. They can be further categorised into strap, fusiform, or fan-shaped.
Fusiform muscles are spindle-shaped, with a wider muscle belly (the thickest part of the muscle) in the centre, tapering to a tendon at each end. The biceps brachii, which flexes the elbow and forearm, is an example of a fusiform muscle. Parallel muscles may also form wide, flat muscles with wide, flat tendons (aponeuroses), typical of abdominal wall muscles.
Fan-shaped, or convergent, muscles are similar to parallel muscles in attachment, although the fascicles do not run parallel to one another, producing a broader muscle. The pectoralis major, the breast muscle situated on the chest, is an example of a convergent muscle.
Strap muscles are long and thin and do not have much strength. An example of a strap muscle is the sartorius muscle, which runs down the thigh to the knee.
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Parallel muscles have a common point of attachment, with fascicles running parallel to each other
Parallel muscles are a type of skeletal muscle, which are the muscles that surround and support our skeleton and move our bones. They are typically long and thin and do not have much strength. They are the most abundant and typical muscle type, with fascicles arranged parallel to one another.
Fusiform muscles are wider and cylindrically shaped in the centre and taper off at the ends. This overall shape is often referred to as a spindle. An example of a fusiform muscle is the biceps brachii, which has a larger central region called a muscle belly that tapers to tendons at each end.
Fan-shaped muscles are less well-defined in the literature, but it seems that they are similar to convergent muscles, which are fan-like and triangular-shaped. An example of a convergent muscle is the pectoralis major, which has a weaker pull on the attachment site compared to other parallel fibres due to their broad nature.
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Parallel muscles are one of the three main types of muscle architecture
Parallel muscles can be further divided into three main categories: strap, fusiform, and fan-shaped. Strap muscles are shaped like a strap or belt and have fibres that run longitudinally to the contraction direction. They have broad attachments compared to other muscle types and can shorten to about 40–60% of their resting length. An example of a strap muscle is the laryngeal muscle, which is thought to control the fundamental frequency used in speech production and singing. The sartorius muscle, which is the longest muscle in the human body, is also a strap muscle.
Fusiform muscles are spindle-shaped, with a wider, cylindrically shaped centre that tapers off at the ends. This shape is often referred to as a muscle belly. Examples of fusiform muscles include the biceps brachii, which flexes the elbow and supinates the forearm, and the psoas major.
Fan-shaped muscles are characterised by fascicles that come to a single, common attachment point. The attachment point could be a tendon, an aponeurosis (a flat, broad tendon), or a raphe (a very slender tendon). An example of a fan-shaped muscle is the pectoralis major, the breast muscle situated on the chest.
While parallel muscles are the most common type of muscle architecture, they are not as strong as pennate muscles, which have a greater amount of muscle fibres and generate greater tension. However, parallel muscles have a greater range of motion than pennate muscles.
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Frequently asked questions
Parallel muscles are the most common type of muscle, with fascicles arranged parallel to one another. They are typically long and thin and are not very strong. Parallel muscles can be further categorized into three types: strap, fusiform, or fan-shaped.
The sartorius muscle, which runs down the thigh to the knee, is an example of a parallel muscle. The biceps brachii and psoas major are also examples of parallel muscles.
Parallel muscles differ from pennate muscles in that the fibres in pennate muscles are at an angle to the force-generating axis, whereas parallel muscles have fibres parallel to the force-generating axis. Parallel muscles also differ from convergent muscles, which have fascicles that do not run parallel to one another, resulting in a broader muscle shape.
