24 Questions
What is the movement of the anterior surface of the humerus during internal rotation?
Toward the midsagittal plane
What is the approximate arc of internal rotation if the scapula is not allowed to anteriorly tilt?
70°
Which muscle works together with others to produce glenohumeral joint internal rotation?
Subscapularis
What is the direction of the forearm during the zero position of joint measurement?
At a right angle to the coronal plane
What is the movement of the anterior surface of the humerus during external rotation?
Away from the midsagittal plane
What is the approximate arc of external rotation of the glenohumeral joint?
90°
Which muscle relaxes as an antagonist to permit glenohumeral joint internal rotation?
Infraspinatus
What is the range of internal rotation when the arm is adducted or extended?
Free
What is the primary function of the serratus anterior and pectoralis minor during scapulothoracic joint movement?
To abduct the scapula
What happens to the upward rotation of the scapula when the rhomboids contract?
It is cancelled out
Which muscles work together to elevate the scapulothoracic joint?
Upper trapezius, levator scapulae, and serratus anterior
Which muscle has a role in stabilisation during elevation of the scapulothoracic joint?
Serratus anterior
What is the result of movement from the traps and serratus during upward rotation?
Upward rotation of the scapula
Which muscles relax as antagonists to permit scapulothoracic elevation?
Pectoralis minor, lower trapezius, and latissimus dorsi
Which muscles work together to depress the scapulothoracic joint?
Lower trapezius, pectoralis minor, and latissimus dorsi
What is required for abduction to occur in the scapulothoracic joint?
Relaxation of the traps and rhomboids
What is the primary function of the serratus and trapezius muscles during upward rotation of the scapula?
They cancel each other out to produce upward rotation
Which muscles relax as antagonists to permit scapulothoracic upward rotation?
Rhomboids, Levator scapulae, and pectoralis minor
What is the movement of the scapula during downward rotation?
The inferior angle moves medially and the glenoid cavity moves caudally
What is the relationship between glenohumeral movement and scapula movement during flexion?
For every 2/3 of glenohumeral movement, there is 1/3 of scapula movement
What is the primary function of the pectoralis minor during downward rotation?
It depresses and abducts the scapula
What is the result of the first 120 degrees of flexion at the shoulder joint?
True flexion
What is the direction of flexion at the shoulder joint?
Anterior direction
Which muscles work together to produce scapulothoracic downward rotation?
Rhomboids, Levator scapulae, and pectoralis minor
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