Ch 5 Shoulder Joint Flashcards
(30 cards)
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
