Flashcards in Chapter 10 Deck (17):
How do skeletal muscles interact with each other?
They work together (adding forces) or opposite to undo each other's movements. They also can only ever pull on bones, they CANNOT push. They pull in a way that the insertion will move towards the origin.
What are the 4 functional groups of skeletal muscle?
1. Prime Mover (agonist)
What is the function of a "prime mover"?
Provides the most force for a particular action
What is the function of a "antagonist"?
opposes or reverses a particular action
What is the function of a "synergists"?
Muscle that are "on", or contracting, together. Help prime movers or reduce undesirable movement's
What is the function of a "fixator"?
synergists that immobilize a bone
How are skeletal muscles named?
3. Size (maximus/ minimus, longus/brevis are examples
4. Direction of the fibers: transverse, oblique, rectus
5. # of origins- how many heads form the origin
6. Location of the attachments
7. Action the muscle will perform
8. Any combination of the above
Name the 5 fascicle arrangements
Describe a "circular" fascicle arrangement
usually a round muscle with fibers in a circular pattern
Describe a "convergent" fascicle arrangement
fibers start at a broad origin and run to a common point
Describe a "parallel" fascicle arrangement
fibers running in the same direction along a long, strap-like muscle
Describe a "fusiform" fascicle arrangement
fibers running in the same direction along a long muscle with a thicker middle portion.
Describe a "pinnate" fascicle arrangement
obliquely running fibers, uni- one set, bi- two sets, multi- three or more sets
What are the three components of a lever system?
Describe the "lever" in a lever system.
Bar that rotates around a point (fulcrum): our bones
Describe the "fulcrum" in a lever system
point in which the lever rotates about: our joints