Shoulder Region - Upper limb الجزء الثاني - MSS أناتومي الـ

Which muscle is primarily responsible for initiating shoulder abduction, specifically in the 0-15 degree range?

Which of the following muscles inserts on the medial lip of the bicipital groove?

The upper triangular space is bordered by the teres minor, teres major, and which other structure?

Which nerve innervates both the teres minor and deltoid muscles?

What action is primarily associated with the posterior fibers of the deltoid muscle?

A patient presents with weakness in lateral rotation of the arm. Which muscle is MOST likely affected?

Which structure passes through the quadrangular space?

Which combination of actions is performed by the subscapularis muscle?

What is a primary action of the teres minor muscle?

The lower triangular space is bounded by the teres major, long head of triceps, and the:

Which structure travels through the lower triangular space?

Where does the supraspinatus muscle originate?

Which of the following muscles inserts on the lesser tuberosity of the humerus?

What combination of muscles form the posterior wall of the axilla?

Which rotator cuff muscle's rupture is most likely to severely limit shoulder abduction?

Which nerve supplies the infraspinatus muscle?

Where does the teres major muscle originate?

What action is performed by the middle fibers of the deltoid muscle?

Which muscle inserts on the highest impression of the greater tuberosity?

What combination of muscles forms the posterior axillary fold?

After a shoulder injury, a patient exhibits an inability to initiate abduction of the arm. If imaging reveals no direct damage to the supraspinatus, which secondary impairment could MOST likely be contributing to this functional deficit?

A surgeon is repairing a complete tear of the infraspinatus tendon. Which anatomical landmark is MOST crucial to identify during the reattachment to ensure proper biomechanical function of the repaired muscle?

During a surgical procedure involving the posterior aspect of the scapula, a surgeon must carefully dissect around the teres minor muscle. Damage to which nerve is the MOST immediate risk during this part of the surgery?

A patient presents with weakness in both lateral rotation and adduction of the arm. Which of the following muscles is MOST likely affected, considering the overlapping functions?

Following a shoulder dislocation, a patient exhibits impaired medial rotation and adduction. Which muscle is MOST likely affected?

A patient is diagnosed with a lesion affecting the lower subscapular nerve. Which combination of shoulder movements would be MOST affected by this injury?

During a physical exam, a patient is asked to abduct their arm. The examiner notes the patient can only achieve abduction beyond 15 degrees with significant hiking of the shoulder. Which muscle is MOST likely dysfunctional?

Damage to the axillary nerve can result in paralysis of the deltoid muscle. Which subsequent biomechanical change would MOST likely occur at the shoulder joint?

A weightlifter strains their shoulder, and an MRI reveals inflammation around the musculotendinous junction of a muscle inserting on the lesser tuberosity of the humerus. Which action would MOST likely cause pain during resisted testing?

A patient has limited shoulder abduction and also demonstrates a positive 'lift-off' test. Which combination of muscle deficits is MOST likely?

A patient reports difficulty reaching behind their back. Weakness during resisted internal rotation is also noted. Which muscle is MOST likely injured?

During a surgical approach to the axilla, which anatomical structure MUST be carefully protected to prevent iatrogenic injury leading to weakness in shoulder abduction and external rotation?

Which of the following scenarios would MOST likely result in a shoulder dislocation?

The posterior wall of the axilla is formed by which combination of muscles?

A patient presents with a winged scapula after a surgical procedure. This is due to injury of what nerve?

Which of the following muscles is primarily responsible for abduction of the arm between 15 and 90 degrees?

Which structure is located in the upper triangular space?

A patient is experiencing pain and limited range of motion with a suspected rotator cuff tear. Assuming a full thickness tear of the MOST commonly affected muscle, which specific movement would be MOST noticeably weak and painful?

Following a shoulder injury, a patient is unable to extend, laterally rotate, and adduct their arm. Which portion of the deltoid is likely impacted, and what other muscle shares the same nerve innervation that may also be affected?