A few short facts: Movement of the body is important for survival. There are more than 600 muscles...
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Transcript of A few short facts: Movement of the body is important for survival. There are more than 600 muscles...
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MUSCLE TISSUE
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A few short facts:•Movement of the body is important
for survival.
•There are more than 600 muscles in the human body
•40% - 50% of body weight
•Muscles pulling on bones is responsible for movement
•The way muscle is grouped and their relationship to joints determines the
type of movement they create
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• Endomysium – around muscle cells
or fibers• Perimysium - hold
groups of muscle fibers together
•Epimysium – covers the entire muscle
group
All these layers attach the muscle to
the bone so the muscle pulls as one
unit
Connective tissue surrounding muscles tissue
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Broad flat sheet of connective tissue
that covers muscle groups called
aponeurosis usually merges with fibrous
wrappings of another muscle
You will see that clearly on the cat
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Structure of skeletal muscle
Size, shape and fiber arrangement
The movement and strength of a muscle is
determined by its overall shape and type of
attachment
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Parallel
•Vary in length but are strap-
like•Fibers are
running parallel to each other
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Convergent
Wide point of attachment to a small point of attachment
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Pennate
Feather-like
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Fusiform
Close to parallel in the middle or belly of muscle but converge to tendon at both
ends
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Spiral
Fibers that twistBetween their
points of attachments
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Circular
Called sphincters
Circle around a body tube or
opening
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Most muscles span at least
one joint, some span two joints
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Names for the attachments of muscles
OriginThe point of attachment that does
not move when the muscle contracts
InsertionThe point of attachment that
moves when the muscle contracts
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•Skeletal Muscles act in groups•Some contract
while others relax
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Prime mover•Agonist
•The muscle or group of muscles that directly performs a specific movement
Antagonists•Muscles that directly oppose the prime
mover•The antagonists is relaxed when the
prime mover is contracting•Provides precision and control during
the contraction of the prime mover the name antagonists is misleading
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Synergists•Muscles that contract at the same time as
the prime mover• Complement the prime mover actions to
make a more effective movement
Fixator• Joint stabilizers
•Maintain posture or balance• Example would be the muscles in the front
and back of the thigh stabilizing the leg when standing
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Most movements are very complex
Most muscles function as
prime mover, antagonists
synergists or fixators at some time depending
on the movement
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A prime mover in flexing arm at the elbow is…….
The Antagonist is…….
Is it different when the
arm is above the
head?
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Do you remember levers, which one is which?
Figure 10-4C. Lever classes. A, Class I: fulcrum (F) between the load (L) and force or pull (P); B, Class II: load (L) between the fulcrum (F) and force or pull (P); C, Class III: force or pull (P) between the fulcrum (F) and the load (L). The lever rod is yellow in each.
In the body: face is the load, the c2 vertebrae is the fulcrum, the muscles of the neck and upper back is the pull
In the body: some anatomists do not agree. Some say raising up on one’s toes is a 2nd class lever. Fulcrum is the toes point of contact with the ground, load is the ankle, pull is the gastrocnemius muscle in the lower legOpening mouth against resistance
In the body: all movement is made by 3rd class levers. The muscle insertion is very close to the joint being moved.
The movement is strong but it is also fast
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So……
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When a body part is moved the muscle moving that part usually does not lie over the part being
moved.The muscle doing the moving is usually
proximal to the part
being m0ved
Muscle doing the
moving
Body part being
moved
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Before we go to the lab to look at the cats we
need to understand how muscles are named.
If we understand how they are named the language
isn’t as foreign as it appears at first glance
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Locationbrachialis - arm, upper arm
gluteus - buttock
Functionadductor – moving the leg toward the
midline of the bodyabductor – moving the part away from
the midline of the body
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Shapedeltoid – triangular
Direction of Fibersrectus – meaning straight
Number of Heads or Divisions
“cep” - means head triceps, quadriceps
biceps bracahii
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Point of Attachmentorigin and/or insertion points
Sternocleidomastoid
Size of MuscleSize compared to size of nearby
musclesgluteus maximus, gluteus medius,
gluteus minimus
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When you and your lab partner start looking at the cat keep
these things in mind
•Use the larger muscles as a guide•Try to figure out to which bones the
two ends attach•Determine what is being moved
when the muscle shortens – what is being moved, what is staying
stationaryinsertion and origin
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•Deltoid•Pectoralis
major•Latissimus
dorsi•Serratus anterior
•Linea alba•Rectus
abdominis•External
oblique•Transverse abdominis
•Internal oblique
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