Types of Muscles
What is the benefit of flat muscles?
able to spread their force over a broad area
What are uniarticular muscles?
act directly on the joint they cross
What are strap muscles?
all fibers arranged in a long parallel manner
What is the benefit of PENNATE over PARALLEL muscles?
arrangement increases cross sectional area, increasing power
What are examples of a unipennate muscle?
biceps femoris, extensor digitorum, and tibialis posterior
What are examples of fusiform muscles?
brachialis and biceps brachii
Where do flat muscles tend to originate from?
broad, fibrous, and sheet-like aponeuroses
What are benefits of strap muscles?
can focus power onto small, bony targets
What is the benefit of fusiform muscles?
can focus power onto small, bony targets
What are biarticular muscles?
cross and act on two different joints
What is an example of a multipennate muscle?
deltoid
What are the 4 skeletal muscle tissue properties?
excitability, contractility, extensibility, and elasticity
What is a unipennate muscle?
fibers run obliquely from a tendon on one side only
What is a bipennate muscle?
fibers run obliquely on both sides from a central tendon
What is a multipennate muscle?
have several tendons with fibers running diagonally between them
What are multiarticular muscles?
muscles that act on three or more joints
What is an example of a sphincter muscle?
orbicularis oris
What are the two types of muscle fiber arrangements?
parallel and pennate
What is the benefit of PARALLEL muscles over PENNATE muscles?
parallel muscles produce a greater range of movement
What are examples of radiate muscles?
pectoralis major and trapezius
What are examples of flat muscles?
rectus abdominus and external oblique
What are examples of a bipennate muscle?
rectus femoris and flexor hallucis longus
What is an example of a strap muscle?
sartorius
What is a fusiform muscle?
spindle shaped with a central belly
What is a sphincter muscle?
technically endless strap muscles
What are flat muscles?
thin and broad
What is a radiate muscle?
triangular and fan-shaped