Posterior torso muscles
The muscles of the posterior dorsal Oregon divided into muscles of inspiration, expiration,
muscles for movement of the vertebral column, but most of the muscles that we can see on
this torso model will be for movement of the extremities.
First I want to talk about muscles of the superficial back.
Muscles of the superficial back or for movement of the upper extremity.
On this model we can see on the right side, coming from the back of the head and coming
from an area known as the ligamentum nuchae in the spinous processes of vertebra all the
way down to T12 a triangular shaped muscle that will come out and insert across the spine
of the scapula.
This is called the trapezius muscle.
The trapezius muscle.
It has fiber directions coming to the scapula from above, from immediately and from laterally.
That means the trapezius crude elevator scapula.
It could retract her scapula.
Or it could be press or scapula.
If we remove the trapezius muscle and go to the muscles just deep to that on this model
I'm going to ignore a few of the muscles to the back of the head for now, we will revisit
those later, we can see her muscle coming from the neck into the scapula, above above,
the vertebral border of the scapula, above the spine of the scapula.
This is called the liberator scapulae muscle.
It lifts the scapula.
If I were to shorten that muscle you would see the scapula would go up.
Then immediately below that we see an area right at the base of the spine of the scapula
and then the remainder of the vertebral border of the scapula.
Ouisie to rhombus shaped muscles, a small one and a large one.
Rhomboideus minor and rhomboideus major.
These muscles help to retract his will is medially rotate the scapula.
Some of the other muscles that we can see, not muscles of the superficial back but we
can see on this model, again we will see with the upper extremity model, supraspinatus muscle
above the spine of the scapula.
Part of the rotator cuff.
Infraspinatus below the spine of the scapula, part of the rotator cuff.
And Terry's minor, also part of the rotator cuff.
We can also See teres major.
Teres major goes to the anterior humerus.
although it does rotate the humerus, it is a video rotator of the humerus, it is not
part of the rotator cuff.
So superficial back muscle so far, the trapezius, leave it or scapula, rhomboideus minor, rhomboideus
major.
The other muscle of the superficial back is called the latissimus dorsi.
Latissimus dorsi has origin from the lumbar fascia and in the spinous processes up to
about T7.
We have removed a joke of it here.
This portion, the upper portion, is deep to the trapezius.
It wraps around anteriorly to insert into the inter-tube or give her groove of the humerus.
Which makes latissimus dorsi an ad doctor, a medial rotator, and extensor of the humerus.
So those are muscles associated with the other extremity that we can see on the back of the
torso model.
No there are a few other muscles.
There are two sets of muscles which run on either side of the spine known as the erector
spinae muscles.
Here we can see erector spinae muscle on this model.
It would be deep to trapezius and a deep conditioner store sign at this point, and they have removed
it here in this section.
So not a good view of the directors funny.
We also have a muscle hear that you can see, although they have removed most of it, that
is coming or poured into the ribs.
This is called the serratus posterior inferior muscle.
This Raitis posterior in fear your muscle helps to pool rooms down.
If you were pulling your ribs down you are exhaling.
So Siri does posterior inferior is known as a muscle of expiration.