Ch. 10 Muscular Gross Anatomy

27 terms by brookebauer 

Create a new folder

Advertisement Upgrade to remove ads

Tendons

Attach muscles to bones

Aponeurosis

A very broad tendon

Origin or head

Muscle end attached to more stationary of two bones

Insertion

Muscle end attached to bone with greatest movement

Belly

Largest portion of the muscle between origin and insertion

Synergists

Muscles that work together to cause a movement; prime mover, agonist, antagonist

Prime mover

Plays major role in accomplishing movement

Agonist

Muscle causing an action when it contracts

Antagonist

A muscle working in opposition to agonist

Fixators

Stabilize joint crossed by the prime mover

Unipennate muscle

all fasciculi on one side of the tendon

Bipennate muscle

meaning feather, fasciculi arranged like barbs of a feather on two sides of a common tendon

Circular muscle

(orbicular) orbicularis oris and oculi

Convergent muscle

fibers converge together (multipennate)

Multipennate muscle

fasciculi arranged at many places around the central tendon (triangular)

Parallel muscle

all fibers go in one direction (straight)

Named for Location

pectoralis (chest), gluteus (buttock), brachial (arm)

Named for Size

maximus (largest), minimus (smallest), longus (long), brevis (short)

Named for Shape

deltoid (triangular), quadratus(quadrate), teres (round), fuisform (like a pump handle), trapezium (like the trapezius), triangular

Named for Orientation

rectus (straight), oblique (oblique to longitudinal axis)

Named for Origin and insertion

sternocleidomastoid (originates on sternum and inserts on the mastoid process of temporal bone), brachioradialis (originates on the brachium, arm, and inserts onto the radius)

Named for Number of heads

biceps, triceps

Named for Function

abductor (moves away from midline), adductor (moves toward midline), masseter (chewer)

Muscle contractions

A pull or force by relative positions of lever (Rigid shaft or bone), Fulcrum (Pivot point or joint), and Weight (resistance)

Class I Lever

Fulcrum between force and weight. Seesaw or head movement

Class II Lever

Weight is between fulcrum and pull. Wheelbarrow, standing on toes

Class III Lever

Pull located between fulcrum and weight. Person using a shovel. Most common

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set