Muscles of the Head Flashcards
Definition of a muscle’s origin:
Usually the non-moving bone
Definition of a muscle’s insertion:
The part being moved by the muscle
Most muscle attachments are
indirect muscle attachments
Types of indirect muscle attachments
Tendons and aponeuroses
What is an aponeurosis?
A sheet-like membrane
What are the 4 basic fascicle arrangements?
Parallel, Circular, Convergent, Pennate
What are the 2 types of parallel fascicle arrangements?
Straplike and Fusiform
What is an example of a muscle with a straplike fascicle arrangement?
What is an example of a muscle with a fusiform fascicle arrangement?
What is a fusiform fascicle arrangement?
The muscle is thicker in the middle, and the ends are more tapered
What is an example of a muscle with a circular fascicle arrangement?
What are the 3 types of pennate fascicle arrangement?
Unipennate, bipennate, and multipennate
What is a pennate fascicle arrangement?
Shaped like a feather
What is an example of a muscle with a unipennate fascicle arrangement?
Extensor Digitorum Longus
What is an example of a muscle with a bipennate fascicle arrangement?
What is an example of a muscle with a mutipennate fascicle arrangement?
What is an example of a muscle with a convergent fascicle arrangement?
What are the 3 functional groups of muscle?
Prime movers, synergists, and antagonists
What is the function of a prime mover?
It is the muscle mainly responsible for a specific movement
What is the function of a synergist?
Muscles that help the prime mover
What are the 2 ways in which synergists help prime movers?
A) they promote the same movement
B) they reduce undesirable movements