Flashcards
Shoulder anatomy
Cards in this deck (12)
- 1What are the 3 bones of the pectoral girdle? everything is logically named and joints are synovial with fibrocartilage, articular discs and capsulesClavicle
Scapula
Humerus - 2Big 3 structures of the scapulaAcromion
Coracoid process
Glenoid fossa
and for orientation - the spine is posterior - 3Intertuburcular (bicipital) groove of the humerusbetween greater and lesser tubercle, the long head of the biceps brachii tendon runs through and into the joint capsule to insert.
- 4What is the commonest fractured bone and why?The clavicle. It is held in place by 4 ligaments (ant. and post. sternoclavicular, costoclavicualr, coracoclavicular) meaning it is rarely dislocated but fractures. All of pectoral girdle is attached to torso by clavicle only.
- 5Intrinsic muscles of shoulder number and why intrinsic6 total - 4 of which are the rotator cuff muscles
originate from scapula or clavicle and attach to humerus - 6Deltoid muscle O+I nerve actionO+I: Clavicle, acromion + scapula --> deltoid tuberosity lateral humerus
N: Axillary (C5-6)
A: ant. fibres - flexion + medial rotation
middle fibres - abduction >15 degrees
posterior fibres - extension + lateral rotation - 7Teres Major O+I nerve actionO+I: posterior surface inferior angle scapula --> medial lip intertubercular groove humerus
nerve: lower scapula (C5-6)
artery: subscapular artery
action: adducts shoulder, medial rotation arm + extension? - 8Rotator cuff musclesTeres minor
Supraspinatus
Infraspinatus
Subscapularis - 9Teres Minor O+I nerve artery actionlateral border scapula --> greater tubercle humerus
axillary (C5-6)
circumflex scapular artery
external rotation, weak adduction. - 10Supraspinatus O+I nerve artery actionsupraspinous fossa scapula --> greater tubercle humerus
suprascapular nerve
suprascapular + dorsal scapula arteries
abducts 15 degrees, then assists deltoid for rest
most common muscle to be inflamed in a rotator cuff injury due to it rubbing on coraco-acromial arch during abduction. - 11Infraspinatus O+I nerve artery actioninfraspinous fossa scapula --> greater tubercle humerus
suprascapular nerve (C5-6)
suprascapular and circumflex arteries
external rotation - 12Subscapularis O+I vessels actionsubscapular fossa costal surface scapula --> greater tubercle humerus
upper + lower subscapular nerves (C5-6)
supracapular, axillary and subscapular arteris
internal rotation
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- Medicine (Anatomy) Flashcards on Shoulder anatomy , created by Maisy Titterton on 12/12/2019.
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- Maisy Titterton
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