Athena Vale
The human body is a complex system of muscles, bones, and tendons, all working together to enable movement. One of the key components of this system is the skeletal muscle, which comes in various shapes, including circular, convergent, parallel, pennate, and fusiform. This text will focus on the parallel muscle, exploring its structure, function, and the types of movements it enables in the human body. Parallel muscles, as the name suggests, are characterised by fibres that run parallel to each other and the force-generating axis, resulting in long, thin muscles with good endurance but less strength. They are often involved in fast and extensive movements, such as running and avoiding danger. Examples of parallel muscles include the Sartorius and the Biceps Brachii.
| Characteristics | Values |
|---|---|
| Definition | Muscles where the fibres are parallel to the force-generating axis |
| Types | Strap, fusiform, fan-shaped |
| Examples | Sartorius, Sternocleidomastoid, Biceps Brachii, Psoas Major, Laryngeal Muscles |
| Description | Long, thin muscles with good endurance but not much strength |
| Use | Fast or extensive movements |
Explore related products
What You'll Learn
Parallel muscles are typically long, thin muscles with good endurance
Fusiform muscles, such as the brachioradialis, are wider and cylindrically shaped in the centre and taper off at the ends. They have fibres that run parallel to one another and are built to provide large ranges of motion. The biceps brachii is a fusiform muscle.
Fan-shaped muscles are a type of convergent, or triangular, muscle. They have fibres that converge at one end (usually at a tendon) and spread over a broad area at the other end. The pectoralis major is a convergent muscle. Parallel muscles have a weaker pull on the attachment site compared to other parallel fibres due to their broad nature. They are considered versatile because of their ability to change the direction of pull depending on how the fibres are contracting.
The skeletal muscles of the body typically come in seven different general shapes: circular, convergent, parallel, pennate, and fusiform. Parallel muscles have fibres that run parallel to each other and are sometimes called strap muscles. They are normally long muscles that cause large movements. Examples of parallel muscles include the sartorius and the sternocleidomastoid.
Understanding Muscle Flexion: How It Powers Your Body
You may want to see also
Explore related products
They are found in the biceps brachii and psoas major
Parallel muscles are those where the muscle fibres are parallel to the force-generating axis. They are often used for fast or extensive movements. Parallel muscles can be further divided into three types: strap, fusiform, or fan-shaped.
The biceps brachii and psoas major are examples of muscles that fall within the parallel group. The biceps brachii is a bi-articular muscle, connected to the shoulder and elbow joints, and is involved in flexing the arm and twisting the forearm. It is innervated by the musculocutaneous nerve and has two origins, the long head and the short head, which join on top of the brachialis muscle on the anterior portion of the arm.
The psoas major is a long, ribbon-shaped core muscle that runs from the lower back, through the pelvis, to the top of the femur. It is sometimes referred to as just the psoas muscle, and some people also have a psoas minor muscle in addition to the psoas major. The psoas muscles help with posture and movement of the hips and upper legs. They act as a bridge, connecting muscles in the abdomen and legs, and allowing for movements that use both simultaneously.
Pectoral Muscle: What It Is and Its Function
You may want to see also
Explore related products
They can be categorised as strap, fusiform, or fan-shaped
Parallel muscles can be further classified into three types: strap muscles, fusiform muscles, and fan-shaped muscles.
Strap muscles are shaped like a strap or belt, with fibres that run longitudinally to the contraction direction. They have broader attachments than other muscle types and can shorten to about 40-60% of their resting length. The laryngeal muscles, which are thought to control the fundamental frequency used in speech production and singing, are an example of strap muscles. Another example is the sartorius, the longest muscle in the human body.
Fusiform muscles are wider and cylindrically shaped in the centre, tapering off at the ends. They have fibres that run parallel to one another along the length of the muscle, forming a spindle shape. The tendons that attach fusiform muscles to bones are restricted to the ends of the muscles, with the thickest part usually near the middle. Examples of fusiform muscles include the biceps brachii and the brachioradialis.
Fan-shaped muscles, also known as convergent muscles, have fibres that converge at one end (typically at a tendon) and spread over a broad area at the other end. They have a weaker pull on the attachment site compared to other parallel fibres due to their broad nature. However, they are considered versatile because of their ability to change the direction of pull depending on how the fibres are contracting. An example of a fan-shaped muscle is the pectoralis major in humans.
Understanding Flat Muscles: Their Structure and Function
You may want to see also
Explore related products
$33.83 $41.95
Parallel muscles are used for fast or extensive movements
Parallel muscles are those where the fibres are parallel to the force-generating axis. They are often used for fast or extensive movements. This type of muscle is typically long and thin and has good endurance, but it is not very strong. Parallel muscles can be further divided 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. They have broad attachments compared to other muscle types and can shorten to about 40–60% of their resting length. The sartorius, the longest muscle in the human body, is an example of a strap muscle. Another example is the sternocleidomastoid. Strap muscles are thought to control the fundamental frequency used in speech production, as well as singing.
Fusiform muscles are wider and cylindrically shaped in the centre and taper off at the ends. They have fibres that run parallel to one another. Fusiform muscles are built to provide large ranges of motion. Examples of fusiform muscles include the biceps brachii and the brachioradialis.
Fan-shaped muscles are those that spread out in a fan shape at one end. An example of a fan-shaped muscle is the pectoralis major.
The third-class lever is a speed lever that operates at a mechanical disadvantage. In the human body, flexing the forearm with the biceps brachii muscle is an example of a third-class lever. The third-class lever is the most common class of lever found in the human body. It allows humans to move their limbs quickly to run and avoid immediate danger.
Deadlifts: Major Muscles and Their Functions
You may want to see also
Explore related products
$75.99
They are not very strong
Parallel muscles are not very strong, but they have good endurance. This is because they have a lower force transmission due to their structure, which results in shorter fibre length. Parallel muscles have fibres that run parallel to each other and are sometimes called strap muscles. They are normally long muscles that cause large movements.
Strap muscles, a type of parallel muscle, 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. The sartorius muscle is an example of a strap muscle and is the longest muscle in the human body.
Convergent muscles, also known as triangular muscles, have a weaker pull on the attachment site compared to other parallel fibres due to their broad nature. This is because they can change the direction of pull depending on how the fibres are contracting.
Pennate muscles, on the other hand, have a greater force production than parallel muscles. This is because they have a larger number of muscle fibres per unit. They are also able to produce more tension for their size compared to non-pennate muscles.
Neural Control of the Digastric Muscle
You may want to see also
Frequently asked questions
Parallel muscles are typically long, thin muscles that can be found in the abdominal wall and the larynx. They can also be found in the biceps brachii, sartorius, and sternocleidomastoid.
Parallel muscles are fibres that run parallel to each other and are sometimes called strap muscles. They are often used for fast or extensive movements and can be measured by the anatomical cross-sectional area (ACSA).
Examples of parallel muscles include the sartorius, sternocleidomastoid, and biceps brachii.
