2. Muscle Tissue: Composed of contractile unites possessing the
properties of
Excitability
Contractility
Extensibility
Elasticity
Functional Unit:
Muscle fiber
Smooth muscle fiber
Striated muscle
Visceral
Skeletal / Cardiac
3. Skeletal Muscle
Functions:
Provides force for Movement and Posture
Stabilizes Joints
Generates heat
Attachments
Origin /Insertion
Direct/Indirect (Tendon/Aponeurosis)
Transmits forces (Fiber orientation?)
Belly
Generates force
4. Structure
Fiber covered by Endomysium—Sarcolemma
Fascicle covered by Perimysium
Muscle covered by Epimysium Epitenon
5. Muscle force is a function of
Number of muscle fibers
Pennation Angle
Pennation Angle
Unipennate Muscles
Bipennate Muscles
Multipennate Muscles
Multipennate
Bipennate
9. CLASSIFICATION
Functional:
Prime Movers / Agonists
Synergist
Antagonists
Number of joints crossed:
Uniarticular
Biarticular
Polyarticular
Specific Action:
Flexor/Extensor
Adductor/Abductor
Supinator/Pronator
Sphincter/Dilator
Levator/Depresssor
Rotator
10. Developmental Origin and Innervation:
Somatic muscles – somatic motor innervation
Visceral muscles – visceral autonomic motor innervation
Composition:
White fibers:
More myofibrils more force
Less myoglobin short duration
Red Fibers:
Less myofibrils weak force
More myoglobin long duration