Anatomy Ch. 11- Axial and Appendicular Muscles

Skeletal muscles are grouped according to their primary actions into which of the following three types?

agonists synergists antagonists

Intramuscular injections are commonly used to administer medication because of which of the following characteristics?

a rich blood supply

When the triceps brachii extends the elbow, its action is considered to be that of which of the following?

agonist

unipennate

all muscle fibers are on one side of the tendon; extensor digitorum

Which type of muscle has widespread muscle fibers over a broad area that collect themselves onto a common attachment site?

convergent muscles

Common intramuscular injection sites include the ____ region.

deltoid

What are some terms used in naming muscles according to shape?

deltoid trapezius rhomboid

When an appendicular muscle is contracting, the less moveable muscle attachment is usually the ______ attachment.

distal

Bundles of muscle fibers, termed ______, lie parallel to each other within a muscle.

fascicles

Many parallel muscles are cylindrical with an expanded central region called a ______.

gaster or body

mutlipennate

has branches of the tendon within the muscle; deltoid

convergent

have widespread muscle fibers over a broad area that meet on a common attachment site

Which four of the following characterize the different patterns of fascicle arrangement?

parallel circular pennate convergent

Which of the following is an example of a convergent muscle?

pectoralis major

agonist

prime mover; a muscle that contracts to produce a particular movement

What are some terms used in naming muscles according to orientation of fascicles?

rectus oblique

A circular muscle is also called a(n) ______.

sphincter

Usually during axial muscle contraction, the more moveable muscle attachment, the ______ attachment is pulled toward the less moveable muscle attachment.

superior

The gluteus maximus muscle gets its name from which categories for naming muscles?

muscle size

Which category is utilized in the naming of the extensor radialis longus muscle?

muscle action

The sternocleidomastoid muscle get its name from which category for naming muscles?

muscle attachments

Which category is utilized in the naming of the deltoid muscle?

muscle shape

Parallel

often associated with cylindrical muscles with a central body tendon

antagonist

opposes the agonist; a muscle that stretches when the agonist contracts

True or false: Parallel muscles have low endurance but are very strong.

False

Match the letter with its muscle fascicle arrangement. A- B- C- D-

A- convergent B- circular C- parallel D- pennate

The orbicularis oris muscle is named for its ______.

arrangement of muscle fascicles and body location

synergist

assists agonist; a muscle that either contributes to tension close to the insertion or stabilizes the point of origin

The orbicularis oris muscle is an example of a ______ muscle.

circular

Circular

concentrically arranged fibers around an opening concentrically arranged fibers around an opening

pennate

these fascicles are arranged at an an oblique angle to the tendon

bipennate

ussually has muscle fibers on both sides of the tendon; rectus femoris