Ch 5 Shoulder Joint Flashcards
What 3 bones serves as the main attachments for the shoulder joint?
Clavicle, Scapula, Humerus
Shoulder joint in specific can be called the _______ joint
Glenohumeral Joint
The glenohumeral joint (GH) or shoulder joint are defined by what 3 characteristics?
M______
B______________
E___________
Multiaxial
Ball & socket
Enarthrodial
Shoulder joint is commonly injured due to its
anatomical design
What 3 characteristics describe why the shoulder joint is so prone to injury?
S______________
L____________
L__________________
Shallowness of glenoid fossa,
Laxity of ligaments,
Lack of strength & endurance
(Shoulder joint vs Shoulder Girdle movement)
Abduction =
Adduction =
Flexion =
Extension =
Upward rotation
Downward rotation
Elevation
Depression
(Shoulder joint vs shoulder girdle movement)
Internal rotation =
External rotation =
Horizontal abduction =
Horizontal adduction =
Diagonal abduction =
Diagonal adduction =
Protraction
Retraction
Retraction
Protraction
Retraction/ Depression
Protraction / Elevation
Movement of the humerus medically around its long axis toward the midline =
Internal rotation
Movement of humerus laterally around its long axis away from the midline =
External rotation
What are the anterior muscles
- Pec major
- Coracobrachialis
- Subscapularis
What are the posterior muscles
- Latissimus Dorsi
- Teres major
- Infraspinatus
- Teres minor
What are the superior muscles
- Deltoid
- Supraspinatus
What is the origin of pec major?
What is the insertion?
- Medial anterior surface of clavicle AND first six ribs at sternum
- flat tendon 2-3 inches outer intertubercular groove (humerus)
What are the actions of pec major?
- adduction of humerus
- internal rotation of humerus
- horizontal adduction of humerus
- diagonal adduction of humerus
What is the origin of corachobracialis?
What is the insertion?
- coracoid process of scapula
- middle medial humerus shaft
What are the actions of coracobrachialis?
- flexion of GH
- horizontal adduction of GH
- Diagonal adduction of GH
What are the origins of the deltoid?
What is the insertion?
- Anterior 3rd of clavicle 2. Lateral acromion 3. Inferior spine of scapula
- deltoid tuberosity of humerus
What are the actions of deltoid?
- horizontal abduction and adduction
- flexion
- extension
- abduction
What is the origin of latissimus dorsi?
What is the insertion? (Same as Teres major)
- posterior ilium // lower 6 thoracic vertebrae // lower 3 ribs
- medial intertubercular groove (humerus)
What is the action of latissimus dorsi? (Same as Teres major)
- adduction of GH
- extension of GH
- internal rotation of GH
What is the origin of Teres major?
What is the insertion? (Same as lats)
- inferior third of lateral border scapula
- medial intertubercular groove
What is the action of Teres major? (Same as Lat)
- adduction of GH
- Extension of GH
- internal rotation of GH
What is the origin of supraspinatus?
What is the insertion?
- medial 2/3 of supraspinatus fossa
- superior of greater tubercle
What are the actions of supraspinatus?
- abduction of humerus
- stabilization of humerus
What is the origin of infraspinatus?
What is the insertion? (Same as Teres minor)
- posterior side of scapula, below spine of scapula
- posterior greater tubercle (kind of below supraspinatus which is SUPERIOR greater tubercle, one is on top the other is on the back)
What is the action of infraspinatus? (Same as Teres minor)
- external rotation
- horizontal abduction
- diagonal abduction
- extension
- stabilization of glenoid fossa
What is the origin of Teres minor?
What is the insertion? (Same as infraspinatus)
- lateral border of scapula on posterior side
- greater tubercle on posterior side
What is the action of Teres minor? (Same as infraspinatus)
- external rotation
- horizontal abduction
- diagonal abduction
- extension
- stabilization of glenoid fossa
What is the origin of subscapularis?
What is the insertion?
- anterior surface of subscapular fossa
- lesser tubercle of humerus
What is the action of subscapularis?
- internal rotation of GH
- adduction of GH
- extension of GH
