MSK Quiz 3

What are the 5 scapular stabilizing/pectoral girdle muscles?

• Pectoralis Minor (NOT MAJOR)

• Serratus anterior

• Trapezius

• Levator scapulae

• Rhomboid major and minor

The lesser tuberosity/tubercle of the humerus is located medial to the bicipital grove TRUE OR FALSE

True

How many joints/articulations make up the shoulder complex?

4

The scapula must move ___ for the shoulder to achieve full flexion or abduction 

60 degrees

How many glenohumeral ligaments stabilize the gelnohumeral joint

3

How many joints does the biceps brachii cross and produce movement? Name them

3

• Elbow joint (humeroulnar)

• Shoulder joint (glenohumeral)

• Proximal radioulnar joint

Weakness of what muscle(s) contribute to scapular winging?

Serratus anterior

The pectoralis major can both flex and extend the glenohumeral joint (shoulder) TRUE OR FALSE 

true 

Name the rotator cuff muscles

• subscapularis

• infraspinatus

• supraspinatus

• teres minor

The shoulder complex is comprised of what 4 joints?

• sternoclavicular (SC)

• acromioclavicular (AC)

• scapulothoracic

• glenohumeral (GH)

The pectoral girdle is comprised of what 3 bones? 

• sternum (manubrium)

• clavicle

• scapulae

On the humerus, the most medial protuberance (looking at you from anatomical position) is what? What lies laterally?

Lesser tubercle → intertubercular groove → greater tubercle

What ANTERIOR muscles move the pectoral girdle? (3)

• subclavius (small muscle, depresses clavical; no scapular atachment, minor to scapula)

• pectoralis minor

• serratus anterior

Winging of scapula is dysfunction of what muscle

the serratus anterior; it resuls in abnormal movement of the scapula. Could be injury to the long thoracic nerve 

What POSTERIOR muscles move the pectoral girdle

• trapezius (upper, middle, and inferior)

• levator scapulae

• rhomboids

  • insertion: C7-T5

Muscles that move the humerus? What innervates them? Where do they all insert?

The rotator cuff

• Supraspinatus, infraspinatus, and subscapularis are innervated by the subscapular nerve

• Teres minor: axillary nerve (near the armpit)

ALL INSERT IN THE GREATER TUBERCLE OF HUMERUS