Download SKELETAL MUSCLE NOTES

Chicken Wing Dissection
1. Partner 1 should put on gloves and retrieve a chicken wing from the
center lab table and place it in the dissecting tray.
2. Partner 2 is responsible for moving through the presentation and
recording answers.
Remove the skin
If the wing is greasy, try washing it
with soap to make it easier to
handle.
Carefully remove the skin from the
chicken wing following the cutting
pattern shown in the diagram.
Only cut away as much skin as seen in
the photo. (Leave the skin on the
hand). Do not cut through any
muscle tissue.
Answer questions 1 and 2
Muscles and Muscle Actions
Find the largest muscle
on the proximal end of
the wing called the
biceps brachii.
Read through slides 4-7
and watch the movie.
Then answer questions
3-7.

Prime mover: the
muscle that provides
most of the movement

Synergist- muscle
that assists the prime
mover
These muscles all
produce the muscle
action of flexion.

Antagonist- the
muscle that opposes
the action of the
prime mover
If the biceps brachii
flexes, then the
triceps brachii would
perform the opposing
action of ……?
Flexion and Extension
Click on the
picture to watch
the video.
Then try it
yourself.
It’s fun!
Answer questions
3-7 if you have not
already done so.
Tendons
Carefully pull the biceps muscle
away from the muscles around it
but do not tear it. Find the place
where it attaches to the bone. Look
near the elbow joint.
Tendon: Attaches muscle to bone
Answer question 8
Continue to the next slide.
The biceps brachii got its name because it has two (bi) attachment points.
These attachment points are known as the origin.

Origin- The location
where the muscle is
attached to the
relatively immovable
end of the bone
Answer question
9.
Insertion: end of
the muscle that is
attached to the
movable bone
Answer questions
10 and 11.
Insertion
The triceps brachii has 3 origins and 1 insertion. You should refer back to
this picture when you draw and label these structures at the end of the lab.
Joints
The place where the
two bones meet is
called a joint or
articulation. Look at
the shoulder joint or
if you wish, remove
the arm muscles and
view the elbow joint.
Answer question 12.
What kind of
cartilage is this?
Ligament
Find a ligament attached to
the proximal end of the
humerus.
Or you can look for
ligaments in the elbow joint
if you cut away the arm
muscles
Answer question 13.

Ligament- Attaches bone to bone
Carefully cut through the
ligaments.
Answer questions 14 and
15.
Draw it.
Draw in the muscles and tendons and then label the
picture of skeletal muscle structures:
Clean up directions on next page.
Clean up




Throw the chicken
parts in the garbage.
Wash and dry your
tray and dissecting
tools.
Wash your hands.
The last class of the
day should also wash
off the lab tables.