03b: Pecs and Shoulder Flashcards
Sternal end of clavicle is (flat/round) and acromial end is (flat/round).
Round; flat
List joints of shoulder.
- Sternoclavicular
- Acromioclavicular
- Scapulothoracic
- Glenohumeral
T/F: Sternoclavicular joint is inherently stable.
False
Sternoclavicular joint is what type of joint (be specific)
Saddle (synovial)
List the associated structures of the sternoclavicular joint.
- Fibrocartilage disc
2. Ligaments
List ligaments involved in stabilizing sternoclavicular joint.
- Sternoclavicular ligament
- Costoclavicular ligament
- Interclavicular ligament
List movements that occur at sternoclavicular joint.
- Protraction/retraction
- Elevation/depression
(some accompanying rotation)
Acromioclavicular joint is what type of joint (be specific)
Plane (synovial)
List the associated structures of the acromioclavicular joint.
- Fibrocartilage disc
2. Ligaments
List ligaments involved in stabilizing acromioclavicular joint.
- Acromioclavicular ligament
2. Coracoclavicular ligament
List movements that occur at acromioclavicular joint.
Gliding (of scapula on clavicle)
Which parts of which bones make up the articulate components of glenohumeral joint?
Head of humerus and glenoid fossa of scapula
Movements at glenohumeral joint.
- F/E
- Ab/Add
- Internal/external rotation
Glenoid fossa is (bigger/smaller) than humeral head. By how much?
Smaller;
1/3 the size
The (X) shoulder joint had compromised (stability/mobility) for increased (stability/mobility).
X = glenohumeral
Stability; mobility
(Contractile/non-contractile) structures enhance glenohumeral joint stability.
Both!
List structures that contribute to glenohumeral stability.
- Glenoid labrum
- Ligaments
- Rotator cuff muscles
List ligaments that contribute to glenohumeral stability.
- Glenohumeral
- Coracohumeral
- Coracoacromial
- Transverse humeral ligament
Glenoid labrum includes (X) attached to (Y) that functions to (Z).
X = fibrocartilaginous ring Y = margin of glenoid fossa Z = deepens glenoid cavity
The tendon of which muscle is found (superior/inferior/medial/lateral) to glenoid labrum?
Superior; biceps
Glenohumeral joint: there are superior, middle, and inferior (X) ligaments.
X = glenohumeral
Where is the coracohumeral ligament of the (X) joint, wrt other ligaments?
X = glenohumeral
Between superior and middle glenohumeral ligaments
Which ligament, along with stabilizing (X) joint, stabilizes tendon of (Y) head of biceps?
X = glenohumeral Y = long
Trasverse humeral ligament
The (X) arch in the shoulder is formed by (Y).
X = coracoacromial Y = acromion and coracoid process of scapula, connected by coracoacromial ligament
What’s the key function of the (X) arch in the shoulder?
X = coracoacromial
Prevents superior displacement of humeral head from glenoid cavity
What’s found under coracoacromial arch?
- Supraspinatus tendon passes through
2. Subacromial/subdeltoid bursa
The reason behind (X) rotation of the humerus during full (Y) is:
X = lateral Y = abduction
Limited subacromial space
We have greater range of motion in (flexion/extention).
Flexion
We have greater range of motion in (internal/external) rotation.
Internal
You shrug your shoulders. Movement is occurring at which joint(s)?
Sternoclavicular, Acromioclavicular, scapulothoracic
What’s scapulohumeral rhythm?
At certain point in abduction of humerus, movement occurs at scapulothoracic joint to accommodate movement at glenohumeral joint (and prevent dislocation)
Location on back where breath may be most easily heard through stethoscope is called (X). Identify the borders.
X = triangle of auscultation
Traps, lats, medial border of scapula
Winged scapula is a big post-op risk for which surgery? Why?
Mastectomy; long thoracic nerve lies on surface of serratus anterior
List the intrinsic scapulohumeral muscles.
- Rotator cuff (SITS)
- Teres major
- Deltoid
- Coracobrachialis
List rotator cuff muscles and star the one(s) on anterior scapula.
- Supraspinatus
- Infraspinatus
- Teres minor
- Subscapularis*
Which rotator cuff muscle works closely with the (anterior/middle/posterior) delts by initiation (X)?
Supraspinatus
Middle;
X = abduction of shoulder
What specifically do rotator cuff muscles do to contribute to stability of (X) joint?
X = glenohumeral
Provide inward (medial) and downward compressive forces to counter the upward shift of humerus due to deltoid action (abduction)
Which muscle is known as the “boxer muscle”?
Serratus anterior
Which nerves are most intimately related to the humerus and likely to be affected with proximal fracture?
Axillary and radial nerves
Median nerve is particularly susceptible to damage with a fracture in which part of humerus?
Distal end
