Lecture 3 Flashcards
S. I. T. S.
- Supraspinatus
- Infraspinatus
- Teres minor
- Subscapularis
make rotator cuff
Only muscle that is anterior to the scapula
Subscapularis
What is the purpose of rotator cuff?
Provides most support
Which muscle is often most damaged and why?
Superspinatus
Supraspinatus: origin
Supraspinous fossa
Supraspinous: insertion
Greater tubercle of the humerus
Supraspinous: innervation
Suprascapular nerve
Supraspinous: Action
Shoulder abduction
Infraspinatus: origin
Infraspinous fossa
Infraspinatus: insertion
Greater tubercle of the humerus
Infraspinatus: action
Lateral shoulder rotation
Teres minor: origin
Superior lateral border of scapula
Teres minor: insertion
Greater tubercle of the humerus
Teres minor: innovation
Axillary nerve
Teres minor: action
Lateral shoulder rotation
Subscapularis: origin
Subscapular fossa
Subscapularis: insertion
Lesser tubercle of the humerus
Subscapularis: innervation
Upper and lower subscapular nerve
Teres major: origin
Posterior inferior angle of scapula
Teres major: insertion
Lesser tubercle of the humerus
Teres major : innervation
Lower scapular nerve
Teres major: action
Addicts, extends, and medically rotates shoulder
Shoulder impingement
- Compression occurs in the subacomial space
- Common causes are bursitis and Supraspinatus inflammation
- Compounded by anterior rotation of the scapula
Posterior arm
- lateral head – posterior body of humerus
- long head – infraglenoid tubercle
- medial head – same as lateral head
Posterior arm: origin
Triceps brachii
Posterior arm: insertion
Decramon process of ulna
Posterior arm: action
Elbow extension, shoulder Adduction
Posterior arm: innervation
Radial nerve
