scapular region LOs Flashcards
1
Q
deltoid
A
- BL: clavicle/acromion/spine of scapule > deltoid tuberosity of humerus
- SC segment: C5-6
- action: flexion/medial rotation (anterior), abduction (middle), extension/lateral rotation/horizontal extension (posterior) of humerus
- innervation: axillary nerve
2
Q
supraspinatus
A
- BL: medial 2/3 of supraspinous fossa > superior facet of greater tubercle of humerus/shoulder joint capsule
- SC segment: C4-6
- action: initiates humeral abduction, laterally rotates humerus, stabilizes GH joint
- innervation: suprascapular nerve
3
Q
infraspinatus
A
- BL: medial 2/3 of infraspinous fossa > middle facet of greater tubercle of humerus, shoulder joint capsule
- SC segment: C5-6
- action: lateral rotation of humerus, stabilize GH joint
- innervation: suprascapular nerve
4
Q
teres minor
A
- BL: upper 2/3 of dorsal lateral border of scapula > inferior facet of greater tubercle of humerus, shoulder joint capsule
- SC segment: C5-6
- action: lateral rotation of humerus, stabilizes GH joint
- innervation: axillary nerve
5
Q
subscapularis
A
- BL: subscapular fossa > lesser tubercle of humerus
- SC segment: C5-6
- action: medial rotation, stabilizes GH joint
- innervation: upper and lower subscapular nerves
6
Q
teres major
A
- BL: dorsal surface of inferior angle of scapula/lower 1/3 of lateral border of scapulae > medial of the intertubercular sulcus of humerus
- SC segment: C5-6
- action: humeral adduction, medial rotation, extension
- innervation: lower subscapular
7
Q
collateral circulation of scapula
A
MEDIALLY
- subclavian artery > dorsal scapular artery
LATERALLY
- subclavian artery > thyrocervical > suprascapular
- subclavian > axillary > subscapular > thoracodorsal/circumflex scapular
8
Q
quadrangular space
A
- border
- lateral to long head of triceps brachii
- inferior to teres minor
- superior to teres maojor
- medial to humerus
- contains
- axillary nerve
- posterior circumflex humeral artery
9
Q
medial border of scapula neurovasculature
A
- border
- medial to scapula
- contents
- dorsal scapular nerve
- dorsal scapular artery
10
Q
scapular notch neurovasculature
A
- border
- superficial to scapula
- near transverse scapular ligament
- contains
- suprascapular nerve (deep to/below ligament)
- suprascapular artery (superficial)
11
Q
shoulder separation
A
- due to FOOSH: fall on an outstretched hand
- injuries to acromioclavicular ligament and coracoclavicular ligament (torn in severe cases)
- clavicle moves over the acromion, acromion free to move inferiorly and damage GH joint
12
Q
shoulder dislocation
A
- GH most frequently dislocated joint in body
- inferior capsule not reinforced by rotator cuff/ligaments
- creates vulnerability in abducted position
- anterior dislocation is 95%
- risks damaging axillary contents when head of humerus descends
13
Q
subacromial space
A
- space above glenohumeral joint and below acromion
- contains bicep tendon, rotator cuff, bursa
- subacromial bursa: between acromion and suprasinatus tendon
14
Q
neurovascular structures that would be injured based on bone fracture at medial border of scapula
A
dorsal scapular nerve and artery
15
Q
location/function of bursae in scapular region
A
- scapular bursae with synovial membranes/fluid reduce friction between bones and tendons
- subacromial bursa: between acromion and supraspinatus tendon
- subdeltoid bursa: between greater tubercle of humerus and deltoid tendon
- subtendinous bursa of subscapularis: between coracoid process and subscapularis tendon
16
Q
humerus (cross section)
A
17
Q
scapula (cross section)
A
18
Q
deltoid (cross section)
A
19
Q
infraspinatus (cross section)
A
20
Q
subscapularis (cross section)
A
21
Q
trapezius (cross section)
A
