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scapula's angle of retroversion
draw a line thru the scapula parallel to the floor along its width, and another thru the body going parallel with the width thru the head of the humerus
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where's the acromion on the scapula
posterior lateral -- it's the upper end of the spine of scap
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where's the coracoid process on the scapula
anterior lateral - it's the beak coming off the front pointing away from your clavicle
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where's the suprascapular notch?
sup ant scap - it's a divot in the anterior upper ridge before the bone veers off for the coracoid process
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where's the spinoglenoid notch?
post lat - btwn the end of the spine (where it veers off to become the acromion) and the edge of the glenoid fossa
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key thing about the suprascapular and spinoglenoid notches?
the suprascapular nerve runs thru them
it's held in the suprascapular notch by the transverse scapular lig
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coracoacromial ligament attachments
- edge of acromion just in front of articular surface for clavicle
- whole length of lat border of coracoid process
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superior tranverse scapular lig - where, and what's she stressing about this guy?
- base of coracoid process to med end of scapular notch
- converts the scapular notch into a foramen
- can ossify
- the suprascapular nerve runs under it, so if tight it can entrap the nerve
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6 true joints and 2 fake of the shoulder complex/girdle
- scapulothoracic (ST)
- glenohumeral (GH)
- sternoclavicular (SC)
- acromioclavicular (AC)
- costosternal
- costovertebral
- suprahumeral (where the coracoacromial lig meets the humerus) aka the humero-coraco-acromial joint
- bicipital groove - not a joint, just a tract with biceps tendon running thru it
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suprahumeral joint
- not a true joint
- aka the humero-coraco-acromial joint
- coracoacromial arch is made by the coracoacromial lig
- supraspinatus tendon passes under this arch
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scapulothoracic joint
- not a true, physiologic joint
- riding of scapul on posterior thoracic wall
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motions at the scapulothoracic joint
- elev/depression
- pro/retraction
- ab/adduction
- up/down rotation of inf angle
- distraction (lifting the scap posteriorly)
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where is the coracoid process in comparison to the clavical?
go 2/3 out laterally along length of clavicle, drop down, it's there
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spine of scap is how far down scapula?
1/3
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a visible sign of problens in nervous tissue or vasculature
atrophy
- and also redness, swelling,
- skin changes (dryness, hair loss) bc of loss of nutrition to skin
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coracobrachialis attachments and muscle
coracoid process of scap --> mid-medial humerus
musculocutaneous nerve (C6, C7)
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which are the scapulothoracic muscles?
- trapezius
- pectoralis minor
- serratus anterior
- rhomboids
- levator scapulae
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what do scapulotharacic muscles do as a group?
- elev/depress scap
- ab/adduction
- up/downward rot of scap
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trap attachments
- med sup nuchal line & external protuberance of occipital bone
- ligamentum nuchae
- SP of C7-T12
- --->
- lateral clavicle
- acromion
- spine of scapula
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trap nerve and actions
- C3, C4, CN XI
- upper fibers: elevate and upwardly rotate scap, extend neck
- middle fibers: adduct scap
- lower fibers: depress and upwardly rotate scap
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pec minor attachments
ant surface of sternal ends of ribs 3-5 --> coracoid process of scap
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pec minor nerve and actions
- med pec nerve (C8, T1)
- draws scap forward and down
- elevates ribs if scap is fixed
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rhomboid M/m nerve
dorsal scapular nerve C5
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levator scapulae attachments
TP of C1-C4 --> sup med border of scap (btwn spine and superior angle)
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serratus anterior attachments
anterior, half way to lat, 1-9th ribs --> medial border of scap
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role of serratus ant, and nerve
- draws scap forward and lat / elevates ribs if scap is fixed
- long thoracic n. C5-C7
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scapulohumeral muscles, as a group, do what actions?
- flex/ext of humerus
- ab/adduction
- IR/ER
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biceps attachments
- long head: supraglenoid tubercle of scapula
- short head: coracoid process fo scapula
- -->
- radial tuberosity on the ant. ulna
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biceps nerve and actions
- musculocutaneous n. (C5, C6)
- flex and supinate elbow
- flex shoulder (weak)
- stabilize humeral head during deltoid contraction
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