ANAT_unit 4_skeletal Muscle Anatomy Notes
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Notes: Skeletal Muscle Anatomy
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(1) Levels of Organization
• Muscle (whole organ)
• Fascicle ( portion of muscle)
• Muscle Fiber (single muscle cell )
• Myofibril (muscle cell organelle)
• Sarcomere ( portion of myofibril )
• Myofilament ( part of sarcomere)
Macroscopic
Microscopic
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Muscle (organ)Fascicle
Muscle Fier (cell)
Muscle Fier
(!it" many nuclei)
Myofiril
Sarcomere
#"in Filament (actin)
#"ick Filament (myosin)
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($) Muscle
• Organ of muscular system
• Contains:
– Muscle Cells – Connective Tissue
– Blood Vessels !erves
– Contractile "nits
• Covered By:
– #$imysium (outer tissue%membrane)
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(%) Fascicle
• &ortion of muscle%organ
• One ste$ do'n from 'ole muscle
• Relationships:
– Bunc of Fascicles Muscle
– Fascicle Bunc of Muscle Fibers
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(&) Muscle Fier
• *ctual Muscle Cell
• Contains:
– Multi$le nuclei
– Striations
– Com$le+ organelles called myofibrils
• Relationships:
– Bunc of Muscle Fibers Fascicle
– Muscle Fiber Bunc of Myofibrils !uclei
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(') Myofiril
• Organelle in a muscle cell
• Contains: – Contractile "nits (Sarcomere)
• Relationships: – Bunc of Myofibrils Muscle Fiber
– Myofibril Bunc of Sarcomere
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() Sarcomere
• &ortion of myofibril
• Contains:
– Contractile $roteins
– Tin filaments 'it actin
– Tic, filaments 'it myosin
• Relationships:
– Bunc of Sarcomeres Myofibril
– Sarcomere Bunc of Myofilaments (*ctin - Myosin)
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() Myofilaments
• Contractile $ortions of sarcomere
• Types: – Tin filaments '.actin (type of protein)
– Tic, filaments '.myosin (type of protein)
• Relationships:
– Bunc of Myofilaments Sarcomere
– Myofilaments /O T0# CO!T1*CT2O!S
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