muscles are contractile organs responsible for the voluntary and involuntary movements of animals
TRANSCRIPT
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•Muscles are contractile organs responsible for
the voluntary and involuntary movements
of animals.
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1. Skeletal muscle
- allows for all voluntary movement
- appears to be striated when looked at under a microscope.
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2. Cardiac muscle
- controls the involuntary beating of the heart
- appears striated under a microscope.
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3. Smooth muscle
- responsible for all other involuntary movement, such as breathing, digestion, peristalsis, blinking, etc.
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AmbulationAmbulation
moving from one place to another
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Abduction Abduction
moving away from the median plane
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AdductionAdduction
moving towards the median plane
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FlexionFlexion
moving the distal part of the limb towards the body
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ExtensionExtension
moving the distal part of the limb away from the body
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All muscles can do is CONTRACT
or RELAX,
so they generally work in pairs.
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For any particular action, the muscles involved can be
classified as:
1) Agonist
2) Antagonist
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Agonist
prime mover of a joint
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Antagonist
opposes movement of the agonist
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Example
For elbow flexion,
the agonist is the bicep
the antagonist is the tricep.
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Example
For elbow extension,
the agonist is the tricep
the antagonist is the bicep.
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Masseter
– superficial muscle of the cheek
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Masseter
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Trapezius
– superficial triangular muscle of the shoulder
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Trapezius
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Latissimus dorsi
– long, superficial, dorsal muscle that attaches the humerus to the
lumbar region of the back
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Latissimus dorsi
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Abdominal obliques
– large flat muscles that support digestive and reproductive organs
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External abdominal oblique
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Gluteals
– large muscle of the upper hindquarters
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Gluteals
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Biceps femoris
– lateral superficial muscle, one of three which forms the
“hamstrings”
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Biceps femoris
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Biceps brachii
– primary flexor of the elbow joint
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Triceps brachii
– primary extensor of theelbow joint
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Triceps brachii
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Pectorals
– primary adductors of the forelimbs
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Pectorals
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Serratus ventralis
– attaches forelimb to trunk(no collarbone!)
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Brachiocephalicus
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Deltoid
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Intercostal
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Semitendinous
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Gastrocnemius