Interactions of Skeletal Muscles, Their Fascicle Arrangement, and Their Lever Systems | Unit 2

Skeletal muscles each have an origin and an insertion. The end of the muscle that
attaches to the bone being pulled is called the muscle's insertion and the end of the
muscle attached to a fixed, or stabilized, bone is called the origin. The muscle
primarily responsible for a movement is called the prime mover, and muscles that assist
in this action are called synergists. A synergist that makes the insertion site more
stable is called a fixator. Meanwhile, a muscle with the opposite action of the prime
mover is called an antagonist. Several factors contribute to the force generated by a
skeletal muscle. One is the arrangement of the fascicles in the skeletal muscle.
Fascicles can be parallel, circular, convergent, pennate, fusiform, or triangular. Each
arrangement has its own range of motion and ability to do work.

00:00 Interactions of Skeletal Muscles, Their Fascicle Arrangement, and Their Lever Systems
00:28 Interactions of skeletal muscles in the body
03:33 Everyday connections
04:51 Patterns of fascicle organization
11:01 The lever system of muscle and bone interactions
12:27 Chapter review



Attribution: OpenStax, Anatomy & Physiology Book
https://openstax.org/books/anatomy-an...