Major Muscle groups- incomplete Flashcards
What occurs when a muscle “contracts”?
The muscle shortens
Its two attachments are pulled closer together
T/F: Muscles act on Joints, not Bones or Regions
True
T/F: Muscles act on joints, bones, and regions
False; only joints
What are some exceptions to the flexing terminology rule?
you can “flex” or “extend” the carpus, tarsus, or vertebral column (regions of bones, not specific bones).
The origin is usually the ______ attachment.
proximal
The insertion is usually the _____ attachment.
distal
Can muscle length increase?
no
Muscles ______ in length during contraction
decrease
Define the “origin” of muscle
where the muscle starts, usually at the proximal attachment
define the “insertion” of muscle
where the muscle ends, usually at the distal attachment
What is a tendon?
fibrous connective tissue that connects muscles to bones
T/F: Muscles are directly attached to bones.
False; muscles are attached to bones by tendons
What is an aponeurosis?
a flat, broad tendon
Heads of a given muscle share what?
either a common origin or a common insertion (not both)
Muscle bellies share what?
both common origin and insertion
What are extrinsic muscles?
muscles or a group of muscles that have one attachment on a given region or organ and the other attachment somewhere outside of the region/organ.
What are intrinsic muscles?
muscles or a group of muscles that have both attachments within the region or organ
Where are cutaneous muscles located
just under the skin
In general, what are the four muscles of cutaneous muscle
- platysma
- cutaneous coli
- cutaneous omobrachialis
cutaneous trunci
What is the cutaneous muscle of the face?
the platysma
What is the cutaneous muscle of the neck?
cutaneous coli
what is the cutaneous muscle that covers the shoulder and arm?
Cutaneous omobrachialis
What is the cutaneous muscle of the trunk?
cutaneous trunci
