Unit 5 Lecture 1 Flashcards
What does the scapulohumeral rhythm do?
The cooperation of the scapula with the movements of the humerus
Where does the scapular movement place the shoulder socket?
In the most favorable position for the head of the humerus
What movement does the girdle do?
Movement of the scapula on your back
What is protraction?
Moves shoulders forward
What is retraction?
Moves shoulders backwards
What type of joint is the sternoclavicular joint?
Saddle joint
What does the sternoclavicular do?
Permits limited motion of the clavicle
What is the sternoclavicular partially responsible for?
Movements of the scapula
The sternoclavicular is the only what?
Bony connection between the humerus and axial skeleton
What do the clavicle movements at the SC joint consist of?
Elevation and depression, protraction and retraction, and forward and backward rotation
What is the acromioclavicular joint?
Joint between the clavicle and the acromion process of the scapula
What are the anterior muscles of the shoulder girdle?
Pectoralis major and serratus anterior
What are the posterior muscles of the shoulder girdle?
Levator scapulae, rhomboids, and trapezius
Pectoralis minor origin and insertion
Scapula and ribs
What actions do the Pectoralis minor perform
Draws scapula downward and lifts rubs in forceful inspiration
Serratus anterior origin and insertion
Scapula and ribs
Action of the serratus anterior
Prime mover of protraction
What muscle is known as boxers muscle
Serratus
Trapezius origin and insertion
Skull and vertebrae and scapula and clavicle
Actions of trapezius
Neck lateral flexion, retraction, and depending on which fibers are active it can do upward and downward rotation of the scapula
What is the origin and insertion of the levator scapulae?
Cervical vertebrae and scapula
Actions of the levator scapulae
Scapular elevation, downward rotation of scapula, and neck lateral flexion
What muscle is the common cause of stiff neck?
Levator scapulae
Rhomboids origin and insertion
Vertebrae and scapula
Action of the rhomboids
Scapula retraction and rotators glenoid cavity downward
What joint is the glenohumeral joint?
Shoulder joint
What is the most freely moving joint in the body?
Glenohumeral joint
What does the numeral head articulate with?
The shallow glenoid fossa of the scapula
What does the glenoid labrum deepen?
The fossa and cushions again the impact of numeral head in forceful movements
What type of tissues does the glenoid labrum use to deepen shoulder socket?
Soft tissues
Anterior shoulder muscles
Pectoralis major, coracobrachialis, subscapularis, and biceps brachii
Superior shoulder muscles
Deltoids and supraspinnatus
Posterior shoulder muscle
Infraspinatus and teres minor
Inferior shoulder muscles
Latissimus dorsi, teres major, and triceps brachii (long head)
Pectoralis major origin and insertion
Sternum and clavicle, and humerus
Action of Pectoralis major
Shoulder flexion, medial rotation, and adduction
Coracobrachialis origin and insertion
scapula and humerus
Action of coracobrachialis
Shoulder flexion and adduction
Subscapularis origin and insertion
Scapula and hunerus
Action of subscapularis
Prime mover of shoulder internal rotation
Biceps brachii origin and insertion
Scapula and radius
Actions of biceps brachii
Shoulder flexion, elbow flexion, and radioulnar supination
Infraspinatus and teres minor origin and insertion
Scapula and humerus
Action of Infraspinatus and teres minor
Lateral rotation of shoulder
Deltoid origin and insertion
Clavicle and scapula, and humerus
Actions of deltoid
Prime mover of shoulder
If only anterior fibers are acting in deltoid what are its actions?
Flexion, horizontal adduction, and medial rotation
If only posterior fibers are acting in deltoid then what are it’s actions?
Extension, horizontal abduction, and lateral rotation
Supraspinatus origin and insertion
Scapula and humerus
Action of supraspinatus
Stabilizes shoulder when carrying something and shoulder adduction
What are the four rotator cuff muscles?
Subscapularis, supraspinatus, Infraspinatus, and teres minor
What rotator cuff is torn most in throwers?
External rotator
What is the mechanism of rotator tear in throwers?
When trying to stop internal rotation
What rotator cuff is commonly torn in regular people?
Supraspinatus
What is Supraspinatus impingement syndrome?
Occurs when repeated forceful abduction movements happen
Latissimus dorsi origin and insertion
Origin:
Pelvis, ribs, and lumbar vertebraE
Insertion:
Humerus
Actions of Latissimus dorsi
Prime mover of shoulder extension, also does adduction and medial rotation
Teres major origin and insertion
Scapula and humerus
Actions of teres major
Shoulder extension, adduction, and medial rotator
What is the teres major also known as?
Lats little buddy
Triceps brachii origin and humerus
Origin: scapula and humerus
Insertion: ulna
Actions of triceps brachii
Prime mover of elbow extension, shoulder stabilization, and adduction
