Jan 26 2026
Anu fundamentals
.
,
Skeletal muscles Shape o fiber arrangement
* responsible for body
movement * muscles have different snapes
* muscles contract
- pulls on affecting:
tendon attached to bone * muscles
ability to exert
* for a musale to force total force
produce
1 muscle = tons of cells called fibers ↑ direction of force production
⑭ fibers pull towards their center
fibers pull on tendons
⑭ tendons pull on bone
*
Cross sectional area
*
* muscles
ability to shorten
greater CSA greater force
=
* all muscles attach to one or more * long muscles can Shorten
bones via tendons
through
a
greater range
* A muscle pulls both of its ends toward * I greater ROM)
its center a
better
↳
* the stabilized bone end will not
move
* origin : proximal bone attachment
* Insertion : distal bone attachment
>
- have
example : biceps brachii action : elbow direction
⑪
flexion
originates from scapula - contractions morearge
scapula does not move
major types of fiber arrangement
: fe
Inserts toradius
*2
as
* parallel - pennate
subdivided
- -
* result : radius
pulled towards * each is due to
scapula * shape
I
=
elbow flexion
moves
muscle nomenclature
* muscles are named due to :
·
anatomical location ex
· Superior
Shape ex Phomboid
·
.
·
size ex-gluteus maximus Parallel muscles
·
# of divisions extriceps brachii *fibers arranged parallel to muscle
·
direction of fibers ex- oblique ab. length
·
point of attachment excoracobrachialis & produce greater ROM than pennate
action ex supinator * limited to only pull in direction of
· .
·
shape - location ex Serratus anterior
.
its fibers
·
location - attachment ex-brachioradialis * fast contraction
-
ex rectus abdominis only causes
Spinal flexion
Anu fundamentals
.
,
Skeletal muscles Shape o fiber arrangement
* responsible for body
movement * muscles have different snapes
* muscles contract
- pulls on affecting:
tendon attached to bone * muscles
ability to exert
* for a musale to force total force
produce
1 muscle = tons of cells called fibers ↑ direction of force production
⑭ fibers pull towards their center
fibers pull on tendons
⑭ tendons pull on bone
*
Cross sectional area
*
* muscles
ability to shorten
greater CSA greater force
=
* all muscles attach to one or more * long muscles can Shorten
bones via tendons
through
a
greater range
* A muscle pulls both of its ends toward * I greater ROM)
its center a
better
↳
* the stabilized bone end will not
move
* origin : proximal bone attachment
* Insertion : distal bone attachment
>
- have
example : biceps brachii action : elbow direction
⑪
flexion
originates from scapula - contractions morearge
scapula does not move
major types of fiber arrangement
: fe
Inserts toradius
*2
as
* parallel - pennate
subdivided
- -
* result : radius
pulled towards * each is due to
scapula * shape
I
=
elbow flexion
moves
muscle nomenclature
* muscles are named due to :
·
anatomical location ex
· Superior
Shape ex Phomboid
·
.
·
size ex-gluteus maximus Parallel muscles
·
# of divisions extriceps brachii *fibers arranged parallel to muscle
·
direction of fibers ex- oblique ab. length
·
point of attachment excoracobrachialis & produce greater ROM than pennate
action ex supinator * limited to only pull in direction of
· .
·
shape - location ex Serratus anterior
.
its fibers
·
location - attachment ex-brachioradialis * fast contraction
-
ex rectus abdominis only causes
Spinal flexion
