Definition of multipennate in English: multipennate adjective Anatomy Zoology Designating, relating to, or exhibiting an arrangement of fibres in a muscle consisting of a number of pennate groups, typically producing a herringbone effect.
What is multipennate muscle?
multipennate muscle A muscle with several tendons of origin and several tendons of insertion, in which fibers pass obliquely from a tendon of origin to a tendon of insertion on each side. See: bipennate musclefor illus. See also: muscle
What is bipennate?
A muscle with several tendons of origin and several tendons of insertion, in which fibers pass obliquely from a tendon of origin to a tendon of insertion on each side. See: bipennate musclefor illus.
What is the difference between pennate and unipennate?
The fascicles attach to the aponeuroses and form an angle (the pennation angle) to the load axis of the muscle. If all the fascicles are on the same side of the tendon, the pennate muscle is called unipennate (Fig. 1A).
Is the extensor digitorum bipennate or unipennate?
The extensor digitorum of the forearm is an example of a unipennate muscle. A bipennate muscle such as the rectus femurs has fascicles on both sides of the tendon as in the arrangement of a single feather.
What is a Multipennate muscle?
Definition. In fields of anatomy the mulipennate muscle describes a muscle which has several fascicles attached obliquely to its tendon.
Which muscle is an example of a Multipennate muscle?
the deltoid muscleMultipennate muscles have fascicles that insert on multiple tendons tapering towards a common tendon, like multiple feathers converging on a central point. A common example is the deltoid muscle of the shoulder, which covers the shoulder but has a single tendon that inserts on the deltoid tuberosity of the humerus.
Where is the Multipennate muscle located?
The rectus femoris, a large muscle in the quadriceps, is typical. If the central tendon branches within a pennate muscle, the muscle is called multipennate (Fig. 1C), as seen in the deltoid muscle in the shoulder.
What is an example of a unipennate muscle?
The extensor digitorum of the forearm is an example of a unipennate muscle. A bipennate muscle has fascicles on both sides of the tendon. In some pennate muscles, the muscle fibers wrap around the tendon, sometimes forming individual fascicles in the process.
Are triceps Multipennate?
Answer and Explanation: The triceps brachii is a parallel muscle as the muscle fibres run parallel to each other for the entirety of the muscle.
Is the trapezius Multipennate?
Trapezius muscle is a multipennate muscle. Fascicle mean length is 1 cm from occiput to C3 and 7-14cm from C3 to T12.
Which part of the deltoid is Multipennate?
acromial partThe deltoid has three functionally and anatomically distinct parts. The acromial part, sometimes also known as the middle or central, is the largest and the strongest. It is a multipennate muscle.
Is the latissimus dorsi a Multipennate muscle?
(2) It ensures a safe tendon suture wherein the muscle-tendon unit is far from the distal end of the skin flap (less possibility of necrosis). The latissimus dorsi (LD) is a triangular pennate muscle. In pennate muscles, the excursion length of muscles is much less than that in strap muscles.
What does Unipennate mean?
Medical Definition of unipennate : having the fibers arranged obliquely and inserting into a tendon only on one side in the manner of a feather barbed on one side a unipennate muscle.
What is Unipennate Bipennate and Multipennate muscle?
Pennate muscles may be uni-, bi- or multipennate muscles, examples of each being the extensor digitorum longus, rectus femoris and the deltoid, respectively. The biceps brachii muscle is an example of afusiform muscle, which is spindle shaped, with tapered ends and a fatter belly.
How many Multipennate muscles are there?
gluteal m's three muscles, the greatest, middle, and least, that extend, abduct, and rotate the thigh.
Which muscle group allows movement away from the midline of the body?
Others, the abductors, make possible movement away from the midline of the body, whereas the adductors permit movement toward the midline. Muscles always act in opposing groups. In bending an elbow or flexing a muscle, for example, the biceps (flexor) contracts and the triceps (extensor) relaxes.
Which muscle has one end attached to the capsule of a joint?
articular muscleone that has one end attached to the capsule of a joint.
What are involuntary muscles?
Involuntary muscles are those not under the control of the conscious part of the brain; they respond to the nerve impulses of the autonomic nervous system. They include the countless short-fibered, or smooth, muscles of the internal organs and power the digestive tract, the pupils of the eyes, and all other involuntary mechanisms.
Which muscleone originates in another part than that of its insertion?
extrinsic muscleone that originates in another part than that of its insertion, as those originating outside the eye, which move the eyeball.
Which muscle extends from one bone to another?
Voluntary muscles extend from one bone to another, cause movements by contraction, and work on the principle of leverage. For every direct action made by a muscle, an antagonistic muscle can cause an opposite movement. To flex the arm, the biceps contracts and the triceps relaxes; to extend the arm, the triceps contracts and the biceps relaxes.
What is the pennate muscle called?
If there are fascicles on both sides of the central tendon, the pennate muscle is called bipennate (Fig. 1B). The rectus femoris, a large muscle in the quadriceps, is typical. If the central tendon branches within a pennate muscle, the muscle is called multipennate (Fig. 1C), as seen in the deltoid muscle in the shoulder .
What is the advantage of pennate muscles?
Pennation angle. One advantage of pennate muscles is that more muscle fibers can be packed in parallel, thus allowing the muscle to produce more force , although the fiber angle to the direction of action means that the maximum force in that direction is somewhat less than the maximum force in the fiber direction.
What is the penniform muscle?
A pennate or pinnate muscle (also called a penniform muscle) is a type of skeletal muscle with fascicles that attach obliquely (in a slanting position) to its tendon.
Why are pennate muscles shorter than other muscles?
In a pennate muscle, as a consequence of their arrangement, fibers are shorter than they would be if they ran from one end of the muscle to the other. This implies that each fiber is composed of a smaller number N of sarcomeres in series. Moreover, the larger the pennation angle is, the shorter are the fibers.
What is the gear ratio of a pennate muscle?
Architectural gear ratio, also called anatomical gear ratio, (AGR) is a feature of pennate muscle defined by the ratio between the longitudinal strain of the muscle and muscle fiber strain. It is sometimes also defined as the ratio between muscle- shortening velocity and fiber-shortening velocity:
Does PCSA depend on mass?
Notice that, although it is practically convenient to compute PCSA based on volume or mass and fiber length, PCSA (and therefore the total fiber force, which is proportional to PCSA) is not proportional to muscle mass or fiber length alone. Namely, the maximum ( tetanic) force of a muscle fiber simply depends on its thickness (cross-section area) and type. By no means it depends on its mass or length alone. For instance, when muscle mass increases due to physical development during childhood, this may be only due to an increase in length of the muscle fibers, with no change in fiber thickness (PCSA) or fiber type. In this case, an increase in mass does not produce an increase in force.
Which muscle is inserted into the patellar tendon?
Insertion. inserts into the patellar tendon as one of the four quadriceps muscles. Artery. lateral femoral circumflex artery. Nerve.
What is the penna muscle?
Pennate muscles (penna = “feathers”) blend into a tendon that runs through the central region of the muscle for its whole length, somewhat like the quill of a feather with the muscle fascicles arranged similar to the feathers.
What is the term for a group of muscle fibers that are bundled together as a unit within the whole?
When a group of muscle fibers is “bundled” as a unit within the whole muscle it is called a fascicle . Fascicles are covered by a layer of connective tissue called perimysium (see Figure 10.3). Fascicle arrangement is correlated to the force generated by a muscle and affects the muscle’s range of motion.
What is a convergent muscle?
When a muscle has a widespread expansion over a sizable area and the fascicles come to a single, common attachment point, the muscle is called convergent. The attachment point for a convergent muscle could be a tendon, an aponeurosis (a flat, broad tendon), or a raphe (a very slender tendon). The large muscle on the chest, the pectoralis major, is an example of a convergent muscle because it converges on the intertubercular groove and greater tubercle of the humerus via a tendon (see image 11.3).
What is the term for flat sheets that expand at the ends to make broad attachments?
Some parallel muscles are flat sheets that expand at the ends to make broad attachments such as the sartorius (see Figure 11.2.2). Other parallel muscles have a larger central region called a muscle belly tapering to tendons on each end. This arrangement is called fusiform such as the biceps brachii (see Figure 11.2.2).
Do pennate muscles move their tendons?
Due to this design, the muscle fibers in a pennate muscle can only pull at an angle, and as a result, contracting pennate muscles do not move their tendons very far. However, because a pennate muscle generally can hold more muscle fibers within it, it can produce relatively more tension for its size.
muscle,
the contractile tissue that effects the movement of and within the body. Muscle tissue in the higher animals is classified as striated, smooth, or cardiac, according to its structure and function. Striated, or skeletal, muscle forms the bulk of the body's muscle tissue and gives the body its general shape.
Muscle
The tissue in the body in which cellular contractility has become most apparent. Almost all forms of protoplasm exhibit some degree of contractility, but in muscle fibers specialization has led to the preeminence of this property. In vertebrates three major types of muscle are recognized: smooth, cardiac, and skeletal.
Muscle
the body tissue of the skeletal and visceral musculatures. Muscles enable animals and man to perform very important physiological functions, such as movement of the body or its individual parts, blood circulation, respiration, passing of chyme through the digestive organs, maintenance of vascular tonus, and excretion.
muscle
A contractile organ composed of muscle tissue that changes in length and effects movement when stimulated.
muscle
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multipennate
Designating, relating to, or exhibiting an arrangement of fibres in a muscle consisting of a number of pennate groups, typically producing a herringbone effect.
multipennate
Early 20th century; earliest use found in Daniel John Cunningham (1850–1909), anatomist.
multipennate
Designating, relating to, or exhibiting an arrangement of fibres in a muscle consisting of a number of pennate groups, typically producing a herringbone effect.
multipennate
Early 20th century; earliest use found in Daniel John Cunningham (1850–1909), anatomist.
Overview
Types of pennate muscle
In skeletal muscle tissue, 10-100 endomysium-sheathed muscle fibers are organized into perimysium-wrapped bundles known as fascicles. Each muscle is composed of a number of fascicles grouped together by a sleeve of connective tissue, known as an epimysium. In a pennate muscle, aponeuroses run along each side of the muscle and attach to the tendon. The fascicles attach to the a…
Etymology
From the Latin pinnātus “feathered, winged,” from pinna “feather, wing.”
Consequences of pennate muscle architecture
One advantage of pennate muscles is that more muscle fibers can be packed in parallel, thus allowing the muscle to produce more force, although the fiber angle to the direction of action means that the maximum force in that direction is somewhat less than the maximum force in the fiber direction. The muscle cross sectional area (blue line in figure 1, also known as anatomical cross sec…