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Fusiform muscles, also known as strap muscles, are a type of muscle with a parallel-fibre arrangement. This means that the muscle fibres are arranged parallel to the longitudinal axis of the muscle. Fusiform muscles are generally associated with a greater range of motion and joint velocity compared to muscles with a different fibre arrangement. The shape of a fusiform muscle is like a spindle, with the thickest part of the muscle usually in the middle and the muscle narrowing at each end. Examples of fusiform muscles include the biceps brachii, sartorius, and brachioradialis muscles.
| Characteristics | Values |
|---|---|
| Muscle shape | Spindle-shaped, wider in the middle and narrowing towards both ends |
| Muscle fibres | Arranged parallel to each other and the long axis of the muscle |
| Muscle motion | Greater range of motion and joint velocity compared to muscles with the same cross-sectional area but with a different fibre arrangement |
| Muscle power | Not a very powerful type of muscle |
| Examples | Biceps brachii, sartorius, brachioradialis, sternohyoid |
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What You'll Learn
Fusiform muscles have a parallel-fibre arrangement
A fusiform muscle, also known as a strap muscle, is a type of muscle with a parallel-fibre arrangement. This means that the muscle fibres are arranged parallel to the longitudinal axis of the muscle. Fusiform muscles have fibres that run parallel to one another and narrow at each end, forming a spindle shape. The tendons that attach fusiform muscles to bones are restricted to the ends of the muscles, with the thickest part of the muscle usually in the middle.
The parallel-fibre arrangement in fusiform muscles allows for a greater range of motion and joint velocity compared to muscles with the same cross-sectional area but a different fibre arrangement. The force produced by fusiform muscles is concentrated into a small area. This is because the line of action in this muscle type runs in a straight line between the attachment points, which are often tendons.
Examples of fusiform muscles include the sartorius, brachioradialis, and sternohyoid muscles. The biceps brachii is another example of a fusiform muscle, with a long head that originates at the glenoid labrum and supraglenoid tubercle and inserts into the radial tuberosity. The biceps brachii is a prime mover, while the muscles that assist in its action are called synergists, and those with the opposite action are called antagonists.
The physical arrangement of muscle fibres, or muscle architecture, determines a muscle's mechanical function. Parallel and pennate (or pinnate) are the two main types of muscle architecture. Muscles with a parallel-fibre arrangement, such as fusiform muscles, have fibres that are parallel to the force-generating axis. This is in contrast to pennate muscles, where the tendons extend for some distance along the length of the belly.
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They are also known as strap muscles
Fusiform muscles, also known as strap muscles, are characterised by their spindle shape, with their widest point being in the middle and narrowing at each end. They are also known as strap muscles because of their strap-like arrangement, which provides the greatest degree of shortening, enabling the muscle to produce a quick and wide range of motion.
The muscle fibres of fusiform muscles are arranged in a parallel fashion, running parallel to one another and the longitudinal axis of the muscle. This is in contrast to other muscle arrangements, such as convergent or triangular muscles, where the fibres do not run parallel to each other. The parallel arrangement of fibres in fusiform muscles allows for a greater range of motion and joint velocity compared to muscles with different fibre arrangements but the same cross-sectional area.
The force produced by fusiform muscles is concentrated into a small area. While they are able to produce a quick and wide range of motion, they are not considered very powerful muscles. Examples of fusiform muscles include the biceps brachii, sartorius, and brachioradialis.
The shape of a muscle is an important indicator of its specific action. Fusiform muscles, with their long, strap-like shape, typically provide a larger range of motion compared to thick, short muscles, which typically produce larger forces. This relationship between muscle shape and function is an essential aspect of muscle architecture, which refers to the physical arrangement of muscle fibres and their resulting mechanical function.
In summary, fusiform muscles, also known as strap muscles, have a unique structure and function. Their spindle shape, parallel fibre arrangement, and strap-like arrangement enable them to produce a quick and wide range of motion, making them well-suited for their specific actions in the body.
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They produce a greater range of motion than other muscles
Fusiform muscles, also known as strap muscles, are a type of muscle with a parallel-fibre arrangement. This means that the muscle fibres are arranged parallel to the longitudinal axis of the muscle. This arrangement results in a greater range of motion compared to muscles with different fibre arrangements, even if they have the same cross-sectional area.
The shape of a fusiform muscle is like a spindle, with a wider middle and narrower ends. This strap-like shape allows for a greater degree of shortening, enabling the muscle to produce quick and wide ranges of motion. Examples of fusiform muscles include the biceps brachii, sartorius, and sternohyoid muscles.
The biceps brachii is a fusiform parallel muscle responsible for flexing the forearm. It has an expanded belly, with muscle fibres arranged parallel to each other and the long axis of the muscle. This arrangement provides a greater degree of shortening, resulting in a large range of motion.
The sartorius muscle is another example of a fusiform muscle. It is a long, strap-like muscle that provides a large range of motion. The fibres in this muscle are also arranged parallel to each other and the muscle's long axis.
Fusiform muscles are known for their ability to produce a greater range of motion than other muscles with different fibre arrangements. This is due to their unique parallel-fibre structure, which allows for a greater degree of shortening and quick, wide ranges of motion.
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Examples include the biceps brachii and sartorius
A fusiform muscle, also known as a strap muscle, is a type of muscle that has a parallel-fibre arrangement. This means that the muscle fibres are arranged parallel to the longitudinal axis of the muscle. Fusiform muscles are generally associated with a greater range of motion and joint velocity compared to muscles with a different fibre arrangement but the same cross-sectional area.
The biceps brachii is a large, thick fusiform muscle on the upper arm's ventral portion. The muscle is composed of a short head and a long head. The long head is located on the lateral side of the biceps brachii, while the short head is located on the medial side. The biceps brachii works across three joints and is able to generate movements in glenohumeral, elbow, and radio-ulnar joints. The muscle is involved in tasks such as lifting, sports involving throwing and racket use, and gesturing.
The sartorius muscle is the longest muscle in the human body. It is a long, thin, superficial muscle that runs down the length of the thigh in the anterior compartment. The sartorius muscle originates from the anterior superior iliac spine and part of the notch between the anterior superior iliac spine and anterior inferior iliac spine. It runs obliquely across the upper and anterior part of the thigh in an inferomedial direction. It passes behind the medial condyle of the femur to end in a tendon. This tendon curves anteriorly to join the tendons of the gracilis and semitendinosus muscles in the pes anserinus, where it inserts into the superomedial surface of the tibia. The sartorius muscle can move the hip joint and the knee joint, but all of its actions are weak, making it a synergist muscle.
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They are spindle-shaped, wider in the middle and narrowing at the ends
Fusiform muscles, also known as strap muscles, are characterised by their spindle shape, being wider in the middle and narrowing at the ends. This shape is created by the parallel arrangement of the muscle fibres, which run alongside each other along the longitudinal axis of the muscle. This is in contrast to non-fusiform muscles, which are more rectangular with a constant diameter.
The biceps brachii is a well-known example of a fusiform muscle, with its fibres arranged in a strap-like fashion. This arrangement allows for a greater degree of shortening, resulting in a quick and wide range of motion. However, despite their ability to produce rapid and large ranges of motion, fusiform muscles are not considered very powerful.
The shape of a muscle is an important indicator of its specific action. Fusiform muscles, with their strap-like shape, are associated with greater ranges of motion and joint velocity when compared to muscles with different fibre arrangements but the same cross-sectional area. This is due to the parallel arrangement of fibres, which allows for efficient force transfer.
The force produced by fusiform muscles is concentrated into a small area. This is because the line of action in this muscle type runs in a straight line between the attachment points, which are often tendons. The thickest part of the muscle is typically near its middle, with the tendons attaching the muscle to bones restricted to the ends.
In summary, fusiform muscles are spindle-shaped, with a wider middle and narrowing ends. This shape is a result of the parallel arrangement of muscle fibres, which enables a greater range of motion and quick contractions. However, despite their versatility in movement, fusiform muscles are not known for their strength.
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Frequently asked questions
A fusiform muscle, also known as a strap muscle, is a muscle with a parallel-fibre arrangement. This means that the muscle fibres are arranged parallel to the longitudinal axis of the muscle.
Examples of fusiform muscles include the biceps brachii, sartorius, brachioradialis, and sternohyoid muscles.
Fusiform muscles are associated with a greater range of motion and joint velocity compared to muscles with a different fibre arrangement but the same cross-sectional area. This is due to their strap-like arrangement, which provides the greatest degree of shortening.
Fusiform muscles are more spindle-shaped, with their diameter at the centre being greater than at either end. Non-fusiform muscles are more rectangular with a constant diameter.
