Lecture 7 Muscular System Flashcards
How many human skeletal muscles are there?
600
What are muscles organized and named by?
Shapes of muscles, actions of muscles, and innervation of muscles
What kind of stability does muscle provide?
Maintains posture against gravity. Prevents unwanted movement, Holds some articulating bones together such as the humerus and scapula
What percentage of body heat results from skeletal muscle metabolism?
85%
What is the dense irregular CT membrane that surrounds the whole muscle?
Epimysium
What heavier CT layer does the epimysium blend into?
Deep fascia
The deep fascia is continuous with the CT of ______
Tendons
What is the CT layer of tissue surrounding a muscle fascicle?
Perimysium
What is the thin layer of loose CT surrounding each muscle cell?
Endomysium
What is the sheet of dense irregular CT that limits how much a muscle can stretch or bulge?
Deep fascia
What is the difference between the origin and insertion attachments of a muscle?
Origin is the stationary end. Insertion is the attachment to the more mobile end of muscle
What is at the ends of muscles that forms sheet-like tendons?
Aponeurosis
What merges with the bone periosteum and is connected by extremely strong perforating fibers (Sharpey’s Fibers)?
Tendons
What is the prime mover of muscle actions?
Agonist
What kind of muscle aids the agonist? Which one opposes the agonist? Which one prevents movement of the bone that the agonist is attached to?
Synergist. Antagonist. Fixator.
