Scapular Region Flashcards
Deltoid attachments
from… clavicle, acromion process & spine of the scapula
to… deltoid tuberosity of the humerus
Deltoid actions
flexion & medial rotation (anterior), abduction (primarily middle), extension & lateral rotation, horizontal extension (posterior) of humerus
Deltoid innervations
axillary nerve
(spinal: C5-C6)
Supraspinatus attachments
from… medial 2/3 of the supraspinous fossa
to… superior facet of the greater tubercle of the humerus & to shoulder joint capsule
Supraspinatus actions
initiates humeral abduction & laterally rotates humerus; stabilizes glenohumeral joint (reinforces superior aspect of joint capsule)
Supraspinatus innervations
suprascapular nerve (C4-6)
Infraspinatus attachments
from… the medial 2/3 of the infraspinous fossa
to… the middle facet of the greater tubercle of the humerus & to shoulder joint capsule
Infraspinatus actions
lateral rotation of humerus; stabilizes glenohumeral joint
Infraspinatus innervations
PNS: suprascapular nerve
CNS: C5-6
Teres minor attachments
from… the upper 2/3 of the dorsal surface of the lateral border of the scapula
to… the inferior facet of the greater tubercle of the humerus & to shoulder joint capsule
Teres minor actions
lateral rotation of humerus; stabilizes glenohumeral joint
Teres minor innervations
axillary nerve (sensory C5-C6)
Teres major attachments
from… the dorsal surface of the inferior angle scapula & lower 1/3 of the lateral border of the scapula
to… the medial lip of the intertubercular sulcus of the humerus
Teres major actions
humeral adduction, medial rotation, & extension
Teres major innervations
lower subscapular nerve (C5-6)
Subscapularis attachments
from… the subscapular fossa
to… the lesser tubercle of the of the humerus
Subscapularis actions
medial rotation of humerus; stabilizes glenohumeral joint
Subscapularis innervations
Upper and lower subscapular nerve (C5-6)
Borders of the quadrangular space
Superior border: teres minor
Lateral border: proximal shaft of the humerus
Inferior border: teres major
Medial border: long head of the triceps brachii
Neurovascular tracts in the quadrangular space
nervous system tracts: axillary nerve
vasculature: posterior circumflex humoral artery
Nerovascular tracts on the medial border of the scapula
Dorsal scapular n & a
Neurovascular tracts in the scapular notch
Suprascapular a over, n under
Location of the subacromial space
Subacromial
Subdeltoid
Subtendinous of subscapularis
Contents of the subacromial space
Subacromial bursa
Subdeltoid bursa
Subscalularis tendon
Subrendinous bursa of subscapularis
What neurovascular structures would be injured based on bone fracture of the medial border of the scapula?
Dorsal scapular nerve and artery
Describe shoulder separation and relate anatomical structures to the injury
Tears in the acromioclavicular and coracoclavicular ligaments
Describe shoulder dislocation and relate anatomical structures to the injury
If the coracoacromial ligament tears the acromiom is free to move down and damage the joint