Dissection 10: Posterior Shoulder & Rotator Cuff Flashcards
name the bones of the pectoral girdle
scapula
clavicle
manubrium of the sternum
name the 3 joints that attach the upper limb to the appendicular skeleton
glenohumeral joint
acromioclavicular
sternoclavicular
most common area of the clavicle to fracture?
middle third
most common areas of the humerus to fracture?
surgical neck
mid-shaft
which joint of the pectoral girdle commonly subluxes/dislocates?
acromioclavicular
most common rotator cuff injury?
partial/complete tear of the supraspinatous tendon
what part of the deltoid muscle is responsible for extension of the shoulder?
posterior/spinal
what part of the deltoid muscle is responsible for abduction of the shoulder
middle/acromial
what part of the deltoid muscle is responsible for flexion at the shoulder?
anterior/clavicular
name the 3 regions of the trapezius?
acscending
middle
descending
what bone is the trapezius muscle responsible for moving?
scapula
what does the ascending part of the trapezius do?
superior rotation of glenoid fossa scapular depression (downward shrug)
what does the descending part of the trapezius do?
superior rotation of glenoid fossa scapular elevation (upward shrug)
what does the middle part of the scapula do?
scapular retraction/adduction
what does the levator scapulae do?
elevates scapula
inferior rotation of glenoid fossa
what does the rhomboid major do?
retracts/adducts scapula
inferior rotation of glenoid fossa
what does the rhomboid minor do
retraction of scapula
inferior rotation of glenoid fossa
what is the mnemonic for the muscles of the rotator cuff?
SITS
name the muscles of the rotator cuff
supraspinatous
infraspinatous
teres minor
subscapularis
what muscles abducts the shoulder up to 15 degrees?
supraspinatous
what muscle takes over abduction of the shoulder after 15 degrees?
middle part of deltoid muscle
what is the function of the infraspinatous muscle?
stabilise head of humerus in glenoid
lateral rotation of shoulder
what is the function of the teres minor
stabilise head of humerus in glenoid
lateral rotation of shoulder
what muscle is responsible for adduction and medial rotation of the shoulder?
teres major
what would happen if you couldnt superiorly rotate the scapula?
wouldnt be able to abduct arm
proximal attachment of the rotator cuff muscles?
scapula
distal attachment of the rotator cuff muscles?
tubercles of the head of the humerus
which rotator cuff muscle medially rotates the humerus?
subscapularis
where do the nerves supplying the rotator cuff come from?
brachial plexus
impingement of what tendon can lead to painful arc syndrome?
supraspinatous
