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MSK - Upper Limb > Shoulder Region > Flashcards

Flashcards in Shoulder Region Deck (17):

What is located directly deep t the deltoid muscle and acromion process and directly superficial to the supraspinatus tendon facilitating movement?

subdeltoid or subacromial bursa


What muscle initiates abduction by 'pulling' onto glenoid cavity?



What closes the suprascapular notch superiorly?

superior transverse scapular ligament


What passes through the suprascapular notch?

suprascapular n.


What passes over the suprascapular notch and ligament?

suprascapular artery


The tendons of which muscles blend with the capsule of the glenohumeral joint strengthening superiorly and posteriorly?

supraspinatus, infraspinatus, teres minor


What muscle mimics and works synergistically with latissimus dorsi (works more in horizontal plane).

teres major


Which shoulder muscle is multipenate and is the most powerful medial rotator?



What muscles are known as the 'rotator cuff' muscles? What is their main function?

subscapularis, supraspinatus, infraspinatus, teres minor
- capture and hold the humerus to the glenoid cavity so there is always at least one point of contact.


Where does the long thoracic nerve lay in regards to the muscle it innervates?

superiorly to latissimus dorsi so it is not 'pitched' during respiration/movement - makes it prone to injury


passage of the long head of the triceps in relation to the teres major, minor, and humerus creates what?

quadrangular and triangular spaces for nerves and vessels to pass from anterior to posterior areas of the shoulder region


What are the borders of the quadrangular space of the shoulder?

superior - teres minor
inferior - teres major
medial - long head, triceps muscle
lateral - humerus


What passes through the quadrangular space of the shoulder?

axillary nerve and posterior humeral circumflex artery (from 3d portion of axillary a.)


What are the borders of the triangular space of the shoulder?

superior - teres minor
inferior - teres major
lateral - long head of triceps


What are the contents of the triangular space of the shoulder?

circumflex scapular a. (branch of the subscapular artery, 3rd portion of axillary a.)


What would a blockage within the axillary a. cause within branches of the subclavian and axillary arteries?

reversal of flow in order to circumvent the blockage (no valves present)


What arteries are involved in the scapular anastomosis?

- deep branch of transverse cervical (thyrocervical trunk)
- suprascapular artery (branch of thyrocervical trunk)
- acromial branch (thoracoacromail, 2 portion axillary)
- circumflex scapular (subscapular, 3 portion axilary)
- thoracodorsal (subscapular, 3 portion axillary)
- anterior and posterior humeral circumflex (3 portion axillary)