Shoulder Region Flashcards
attachment of deltoid
origin:
lateral 1/3 anterior border of clavicle, acromion, spine of scapula
insertion:
deltoid tuberosity of humerus
action of deltoid?
anterior - flexes, medially rotates
posterior - extends, laterally rotates
anterior, middle, posterior - abducts
innervation of deltoid?
axillary nerve
subacromial bursa
or subdeltoid bursa
directly deep to deltoid and superficial to supraspinatus
attachment of suspraspinatus
origin:
supraspinous fossa of scapula
insertion:
highest facet, posterior surface greater tubercle of humerus
action of supraspinatus
initiates abductino of humerus
innervation of supraspinatus
suprascapular nerve
what initiates abduction?
supraspinatus
attachments of infraspinatus
origin:
infraspinous fossa of scapula
insertion:
middle facet, posterior surface greater tubercle of humerus
action of infraspinatus
lateral rotation of humerus
innervation of infraspinatus
suprascapular nerve
what do you lose first, cutaneous or motor?
cutaneous innervation
superior transverse scapular ligament
closes off the suprascapular notch
- suprascapular artery passes superior
- suprascapular nerve passes inferior
both structures supply supraspinatus and send branches around neck of acromion via great scapular notch to the infraspinatus
teres major attachments?
origin:
dorsal surface, inferior angle of scapula
insertion:
crest of lesser tubercle of humerus
action of teres major?
extension, adduction, medial rotation
same as latissimus, but better in horizontal plane
latissimus better in vertical plane
innervation of teres major?
lower subscapular nerve
attachments of teres minor?
origin:
middle 1/3 to upper 2/3 of lateral border of scapula
insertion:
lowest facet, posterior surface greater tubercle of humerus
action of teres minor
alteral rotation of humerus
innervation of teres minor
axillary nerve
tendon of supraspinatus, infraspinatus, teres minor?
blend with capsule of glenohumeral joint and strengthen superiorly and posteriorly
rotator cuff
subscapularis, infraspinatus, teres minor, supraspinatus
holds humerus in glenoid cavity in ALL ranges of motion
serratus anterior attachments
origin:
outer surface of ribs 1-8 or 9
insertion:
vertebral costal surface of scapula from superior to inferior angle
action of serratus anterior
protracts scapula, upward rotation of glenoid cavity, fixates scapula to thoracic wall
also accessory to respiration if scapula fixed
innervation of serratus anterior
long thoracic nerve
-only nerve that is superficial to the muscle it innervates
makes injury common
winged scapula?
injury to long thoracic nerve paralyzes serratus anterior
elevation of scapula away from body along its medial border and inferior angle
inability to completely abduct upper limb, or push upper limb forward against resistance
quadrangular space
superior - teres minor
inferior - teres major
medial - long head, triceps muscle
lateral - humerus
contents of quadrangular space?
axillary nerve
posterior humeral circumflex artery (branch of 3rd portion of axillary)
triangular space?
superior - teres minor
inferior - teres major
lateral - long head triceps
contents of triangular space?
circumflex scapular artery
-branch of subscapular artery from 3rd portion of axillary
scapular anastomosis
blockage of axillary artery can result in flow reversal within branches of subclavian and axillary artery (no valves)
anastomoses of scapular?
suprascapular and transverse cervical anastomose with circumflex scapular and thoracodorsal artery
acromial branch of thoracoacromial anastomose with circumflex humeral artery loop
transverse cervical artery anasatomose with branches intercostal arteries
