Muscles origin and Insertion - Back Flashcards
Trapezius O&I
Superior:
o = nuchal line and ligament
i = acromion of scapula and end of clavicle
Middle:
o= spinous process of C7-T3-4
I = Spine and acromium of scapula
Lower:
o= spinous process of T4-12
I= Spine of scapula
action of trapezius?
Scapula:
- retraction
- elevation
Extend head side to side
Latissimus Dorsi O&I
o=
- spinous process T7-T12
- Thoracolumbar fascia
- iliac crest
- inferior surface of ribs 9-12
- inferior angle of scapula
1= lesser tubercle of humerus
what is the function of the latissimus dorsi?
- internally rotate shoulder
- adduct
- extends shoulder
Rhomboid major O&I
O= Spinous process of T1-4
I= Lower 2/3 of medial border of scapula
what is the function of rhomboid major?
Scapula:
- elevates
- retracts
- internal rotation
Romboid minor O&I
O= Spinous process of C6-7
I= Upper 1/3 of scapula medial border
what is the function of the rhomboid minor?
Scapula:
- elevates
- retracts
- internal rotation
Levator Scapula O&I
O= Spinous process of C1-4
I= Superior angle of scapula
what is function of levator scapula?
- elevates the scapula
Supraspinatus O&I
O= Supraspinous fossa of scapula
I = Greater tubercle of humerus [superior aspect]
function of supraspinatus
external rotation and abduction 0-15 degrees
Infraspinatous O&I
O= Infraspinous fossa
I= Greater tubercle of the humerus
Infraspinatus action:
External rotation
Infraspinous action
- External rotation
Teres minor O&I
O= Posterior & lateral border of scapula
I= Greater tubercle of the humerus (inferior aspect)
Teres minor action:
External rotation
Subscapularis O&I
O= Subscapular fossa
I= Lesser tubercle of humerus
subscapularis action:
Internal rotation
