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من طرف hashem yaser ababneh الأربعاء أكتوبر 15, 2008 3:05 pmThe muscular system
Although there are three types of muscle tissue in the body ( skeletal, cardiac and smooth),the term muscular system, refers to the voluntary skeletal muscle system :the skeletal muscle tissue and connective tissues that make up individual muscle organs , such as the biceps brachii muscle.
To understand how movement occurs at specific joints , you must be able to identify the body's major skeletal muscle groups .moreover ,it is important to know the attachment sites of each muscle ,as will as it's innervation "nerve supply".
Developing a working knowledge of these key points of skeletal muscle anatomy will enable you to analyze how movements happen normally . this knowledge is exceptionally important for a host of allied health and physical rehabilitation professionals who work with people whose normal patterns of movement and physical mobility have been disrupted by circumstances such as physical trauma, surgery, or muscular paralysis.
Muscle attachment sites :origin and insertion
Not all skeletal muscles produce movements . for example ,some skeletal muscle stabilize bones so that another skeletal muscle can execute movements more efficiently . Skeletal muscles that do produce movements do so by exerting force on tendons , which in turn pull on bones or other structures (such as skin). Most muscles cross at least one joint and are usually attached to articulating bones that form the joint .
When a skeletal muscle contracts , it draws one of the articulating bones toward the other. The two articulating bones usually do not move equally in response to contraction . One bone remains stationary or near its original position , either because other muscles stabilize that bone by contracting and pulling it in the opposite direction or because its structure makes it less movable . Ordinarily , the attachment of a muscles tendon to the stationary bone is called the origin ; the attachment of the muscles other tendon to the movable bone is called the insertion . A good analogy is a spring on a door . In this example , the part of the spring attached to the frame is the origin ; the part attached to the door represents the insertion . A useful rule of thumb is that the origin is usually proximal and the insertion distal , especially in the limbs and the insertion is usually pulled toward the origin .
The fleshy portion of the muscle between the tendons is called the belly (gaster). Keep in mind that muscles that move a body part often don't cover the moving part. One of the functions of the biceps brachii muscle is to move the forearm , the belly of the muscle lies over the humerus, not the forearm. The muscle that cross two joints . such as rectus femoris and sartorius ,have more complex actions than muscle that cross only one joint.
In the limbs ,skeletal muscles and their associated blood vessels and nerves are grouped into functional groups called compartments.
GOOD LUCK
hashem ababneh ---- pt & ot
Although there are three types of muscle tissue in the body ( skeletal, cardiac and smooth),the term muscular system, refers to the voluntary skeletal muscle system :the skeletal muscle tissue and connective tissues that make up individual muscle organs , such as the biceps brachii muscle.
To understand how movement occurs at specific joints , you must be able to identify the body's major skeletal muscle groups .moreover ,it is important to know the attachment sites of each muscle ,as will as it's innervation "nerve supply".
Developing a working knowledge of these key points of skeletal muscle anatomy will enable you to analyze how movements happen normally . this knowledge is exceptionally important for a host of allied health and physical rehabilitation professionals who work with people whose normal patterns of movement and physical mobility have been disrupted by circumstances such as physical trauma, surgery, or muscular paralysis.
Muscle attachment sites :origin and insertion
Not all skeletal muscles produce movements . for example ,some skeletal muscle stabilize bones so that another skeletal muscle can execute movements more efficiently . Skeletal muscles that do produce movements do so by exerting force on tendons , which in turn pull on bones or other structures (such as skin). Most muscles cross at least one joint and are usually attached to articulating bones that form the joint .
When a skeletal muscle contracts , it draws one of the articulating bones toward the other. The two articulating bones usually do not move equally in response to contraction . One bone remains stationary or near its original position , either because other muscles stabilize that bone by contracting and pulling it in the opposite direction or because its structure makes it less movable . Ordinarily , the attachment of a muscles tendon to the stationary bone is called the origin ; the attachment of the muscles other tendon to the movable bone is called the insertion . A good analogy is a spring on a door . In this example , the part of the spring attached to the frame is the origin ; the part attached to the door represents the insertion . A useful rule of thumb is that the origin is usually proximal and the insertion distal , especially in the limbs and the insertion is usually pulled toward the origin .
The fleshy portion of the muscle between the tendons is called the belly (gaster). Keep in mind that muscles that move a body part often don't cover the moving part. One of the functions of the biceps brachii muscle is to move the forearm , the belly of the muscle lies over the humerus, not the forearm. The muscle that cross two joints . such as rectus femoris and sartorius ,have more complex actions than muscle that cross only one joint.
In the limbs ,skeletal muscles and their associated blood vessels and nerves are grouped into functional groups called compartments.
GOOD LUCK
hashem ababneh ---- pt & ot
