Information about Antagonist (muscle)
An antagonist is a kind of muscle that acts in opposition to the movement generated by the agonist and is responsible for returning a limb to its initial position.
Antagonistic pairs are needed in the body because muscles can only exert a pulling force, and can't push themselves back into their original positions. An example of this kind of muscle pairing is the biceps and triceps.
When the biceps is contracting, the triceps is relaxed, and is able to be stretched back to its original position. This is the opposite when the triceps is contracting.
The Rectus Femoris biarticular muscle acting over the hip, when compared to the hamstrings has a smaller hip movement arm. But, the rectus femoris movement arm is greater over the knee, than the hamstring's knee movement. This means that contraction from both rectus femoris and hamstrings will result in hip extension, and knee extension. Hip extension will also add a passive stretch component to the Rectus Femoris, and will result in a knee extension force. This "paradox" allows for efficient movement especially during gait.[1]
In human anatomy, the biceps brachii is a muscle located on the upper arm. The biceps has several functions, the most important simply being to flex the elbow and to rotate the forearm.
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Antagonistic pairs in houses
These antagonistic muscles are found in pairs called antagonistic pairs. These consist of an extensor muscle, which "opens" the joint (i.e. increasing the angle between the two bones), and a flexor muscle, which does the opposite to an extensor muscle.Antagonistic pairs are needed in the body because muscles can only exert a pulling force, and can't push themselves back into their original positions. An example of this kind of muscle pairing is the biceps and triceps.
When the biceps is contracting, the triceps is relaxed, and is able to be stretched back to its original position. This is the opposite when the triceps is contracting.
Lombard's Paradox
When you stand up from a sitting position, both the hamstrings and quadriceps contract at the same time.The Rectus Femoris biarticular muscle acting over the hip, when compared to the hamstrings has a smaller hip movement arm. But, the rectus femoris movement arm is greater over the knee, than the hamstring's knee movement. This means that contraction from both rectus femoris and hamstrings will result in hip extension, and knee extension. Hip extension will also add a passive stretch component to the Rectus Femoris, and will result in a knee extension force. This "paradox" allows for efficient movement especially during gait.[1]
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Joints | |
|---|---|
| Types of joints | Amphiarthrosis - Symphysis - Gomphosis - Synovial joint (Hinge joint, Pivot joint, Condyloid joint, Saddle joint, Ball and socket joint, Gliding joint) |
| Terminology | Kinesiology - Anatomical terms of motion - Agonist/Antagonist |
| Motions | Flexion/Extension - Adduction/Abduction - Internal rotation/External rotation - Supination/Pronation - Plantarflexion/Dorsiflexion - Eversion/Inversion - Elevation/Depression - Protraction/Retraction |
MUSCLE (multiple sequence comparison by log-expectation) is public domain, multiple sequence alignment software for protein and nucleotide sequences.
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Agonist is a kind of muscle that causes movement to occur. It creates the normal range of movement in a joint by contracting. Agonists are also referred to as "prime movers" since they are the muscles that are primarily responsible for generating movement.
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An extensor muscle is any skeletal muscle that opens a joint increasing the angle between components of a limb, such as straightening the knee or elbow and bending the wrist or spine. With the exception of the knee joint the movement is directed backward.
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A flexor muscle is a skeletal muscle whose contraction bends a joint, decreasing the angle between components of a limb, such as bending the knee or elbow. This action is known as flexion.
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An extensor muscle is any skeletal muscle that opens a joint increasing the angle between components of a limb, such as straightening the knee or elbow and bending the wrist or spine. With the exception of the knee joint the movement is directed backward.
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- For other uses, see biceps.
In human anatomy, the biceps brachii is a muscle located on the upper arm. The biceps has several functions, the most important simply being to flex the elbow and to rotate the forearm.
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The triceps brachii muscle is often simply called the triceps (both singular and plural). However, the term triceps (Latin for "three-headed") can mean any skeletal muscle having three origins.
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Lombard's Paradox describes a paradoxical muscular contraction in humans. When standing up from a sitting position, both the hamstrings and quadriceps contract at the same time. However, these muscle groups are antagonistic, meaning that they should not contract at the same time.
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In human anatomy, a hamstring refers to one of the tendons that makes up the borders of the space behind the knee. In modern anatomical contexts, however, they usually refer to the tendons of the semitendinosus, the semimembranosus, and the biceps femoris.
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- "Quads" redirects here. For other uses see Quad
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Hering's law of equal innervation is used to explain the conjugacy of eye movements (saccades) in stereoptic animals. The law which was put forward by Hering in the 19th century proposes that conjugacy of saccades is due to innate connections in which the eye muscles responsible
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Sherrington's law of reciprocal innervation, also called Sherrington's law II explains how a muscle will relax when its opposite muscle (i.e., bicep/tricep) is activated. René Descartes had hypothesized as much in 1626.
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Released October 31, 2007
Genre J-Pop
Length N/A
Label Geneon
Producer(s) I've Sound
Mami Kawada singles chronology
Get my way!
(2007) JOINT
(2007)
JOINT
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Genre J-Pop
Length N/A
Label Geneon
Producer(s) I've Sound
Mami Kawada singles chronology
Get my way!
(2007) JOINT
(2007)
JOINT
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Amphiarthroses is a type of continous joint. In Amphiarthroses (slightly movable articulations), the contiguous bony surfaces are either:
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- symphysis: connected by broad flattened disks of fibrocartilage, of a more or less complex structure, as in the articulations
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A symphysis is a fibrocartilaginous fusion between two bones. The more prominent symphyses are:
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- the pubic symphysis
- the symphyses between the bones of the skull, most notably the mandible (symphysis menti)
- sacrococcygeal symphysis
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Gomphosis is a synarthrosis (joint) that binds the teeth to bony sockets in the maxillary bone and mandible. The fibrous connection between a tooth and its socket is a periodontal ligament.
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Synovial joints (or diarthroses, or diarthroidal joints) are the most common and most moveable type of joints in the body. As with all other joints in the body, synovial joints achieve movement at the point of contact of the articulating bones.
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In the hinge joint (ginglymus), the articular surfaces are moulded to each other in such a manner as to permit motion only in one plane, forward and backward, the extent of motion at the same time being considerable.
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Pivot joint (trochoid joint, rotary joint): Where the movement is limited to rotation, the joint is formed by a pivot-like process turning within a ring, or a ring on a pivot, the ring being formed partly of bone, partly of ligament.
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In a condyloid joint (condyloid articulation, ellipsoidal joint) an ovoid articular surface, or condyle, is received into an elliptical cavity in such a manner as to permit of flexion, extension, adduction, abduction, and circumduction, but no axial rotation.
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In a saddle joint (sellar joint, articulation by reciprocal reception) the opposing surfaces are reciprocally concave-convex.
The movements are the same as in a condyloid joint; that is to say, flexion, extension, adduction, abduction, and circumduction are
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The movements are the same as in a condyloid joint; that is to say, flexion, extension, adduction, abduction, and circumduction are
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ball and socket joint (enarthrosis, spheroidal joint) is a joint in which the distal bone is capable of motion around an indefinite number of axes, which have one common center.
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A gliding joint (arthrodial joint, plane articulation) is a synovial joint which admits of only gliding movement.
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Example
It is the form present in:- the joints between the articular processes of the vertebrae,
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Kinesiology is the scientific study of the anatomy, physiology, and mechanics of body movement, especially in humans. [1] The word kinesiology is derived the Greek "kinesis" (motion) + the suffix -ology or -logy from the greek "logos" or "logia"(meaning a field of study).
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hyper- is sometimes added to emphasize movement beyond the normal position, such as in hyperflexion or hyperextension. Such movements can put significant stress on the joints involved.
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Agonist is a kind of muscle that causes movement to occur. It creates the normal range of movement in a joint by contracting. Agonists are also referred to as "prime movers" since they are the muscles that are primarily responsible for generating movement.
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flexion is a position that is made possible by the joint angle decreasing. The skeletal (bones, cartilage, and ligaments) and muscular (muscles and tendons) systems work together to move the joint into a "flexed" position.
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Extension is a movement of a joint. For example, extension is produced by extending the flexed elbow. The arm is now straight; it has been extended. If the head is tilted all the way back, it is said to be extended.
The movement in the opposite directions is called flexion.
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The movement in the opposite directions is called flexion.
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Adduction is a movement which brings a limb - arm or leg - closer to the sagittal plane of the body. It is opposed to abduction.
This term is also used when one speaks about the operation of the muscle in anatomy or musculature.
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This term is also used when one speaks about the operation of the muscle in anatomy or musculature.
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Abduction, in functional anatomy, is a movement which draws a limb away from the median (Sagittal) plane of the body. It is thus opposed to adduction.
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Muscles of abduction
Upper limb
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