What is the structure and organization of muscle fascicles?
Patterns of Fascicle Organization. Skeletal muscle is enclosed in connective tissue scaffolding at three levels. Each muscle fiber (cell) is covered by endomysium and the entire muscle is covered by epimysium. When a group of muscle fibers is “bundled” as a unit within the whole muscle it is called a fascicle.
Which muscle has a convergent pattern of fascicles?
the pectoralis major
The large muscle on the chest, the pectoralis major, is an example of a convergent muscle because it converges on the greater tubercle of the humerus via a tendon.
What is the structure of a fascicles?
A skeletal muscle fascicle consists of 20 to 60 fibers surrounded by a connective tissue sheath. A single muscle fiber is innervated by only one motor unit, but there may be two to three motor units within a fascicle. The muscle fibers of one motor unit may be distributed over 100 fascicles.
What is the fascicle arrangement of the pectoralis major?
Anatomy week 1-6
| Question | Answer |
|---|---|
| The muscle fascicle arrangement for Orbicularis oris is best characterized as | circular |
| This arrangement of muscle fascicles tends to be triangular in shape. The Pectoralis major is an example of a muscle with this type of muscle fascicle arrangement. | convergent |
What are the four patterns of fascicle arrangement?
Shapes of Skeletal Muscles Four distinct patterns of fascicles are seen within the whole of the muscle: parallel, convergent, pennate, and circular (Figure 2).
What are the four types of muscles identified by different patterns of organization?
Based on the patterns of fascicle arrangement, we can classify skeletal muscles as parallel muscles, convergent muscles, pennate muscles, and circular muscles (Figure 11–1).
Which muscle has a convergent pattern of fascicles quizlet?
Triangular muscles, such as the pectorals major in the chest, usually have a convergent fascicle arrangement. A convergent muscle is a broad muscle that uniformly tapers to a ________ tendon. Triangular muscles, such as the pectorals major in the chest, usually have a convergent fascicle arrangement.
What is a group of fascicles called?
Structure. Muscle cells are grouped into muscle fascicles by enveloping perimysium connective tissue. Fascicles are bundled together by epimysium connective tissue. Muscle fascicles typically only contain one type of muscle cell (either type I fibres or type II fibres), but can contain a mixture of both types.
What are the major functional groups of muscles?
To describe how muscles work together, we can use the following four functional types: agonist, antagonist, synergist, and fixator.
Which structural pattern listed would have fascicles arranged in a feather shaped pattern?
In a pennate pattern, the fascicles are short and they attach to a central tendon that runs the length of the muscle. This creates a feather shaped appearance.
What type of muscle fascicle pattern has an appearance similar to a feather?
Fascicles in a pennate pattern are attached like plumes of a feather to an elongate tendon. This is typical of muscles of the limbs. The fascicles may be attached only on one side of the tendon (unipennate) or to both sides (bipennate).
What are fascicles held together by?
Muscle fascicles are held together by a common collagenous connective tissue layer called. ligament.
What are the 4 main functional groups of skeletal muscles?
Terms in this set (5)
- Prime mover.
- synergist.
- antagonist.
What are the 4 major functional characteristics of muscle tissue?
What are the four major functional characteristics of muscle tissue? Contractility, excitability, extensibility, and elasticity.
What are the 5 major properties of the muscular system?
There are 5 major properties to the muscular system.
- Excitable or Irritable.
- Contractible.
- Extensible.
- Elasticity.
- Adaptability.
What is parallel fiber arrangement?
Pattern of fibres within a muscle in which the fibres are roughly parallel to the longitudinal axis of the muscle.