Ch 10- Shoulder Joint Flashcards
Joint motions at shoulder joint
flexion/extension/hyperextension, abduction/adduction, medial/lateral rotation, horizontal abduction/adduction
Flexion degrees of motion
0 to 180 degrees
Hyperextension degrees of motion
45 degrees
Abduction/adduction degrees of motion
180 degrees of motion possible
Medial/lateral rotation degrees of motion
90 degrees in each direction
Horizontal abduction degrees (backward motion) of motion
30 degrees
Horizontal adduction degrees (forward motion) of motion
120 degrees
Scaption of shoulder degrees of motion
180 degrees of up and down motion is possible
Normal end feel for all shoulder joint motions
firm
greatest amount of arthrokinematic motion is when ___
glenohumeral joint is in the open packed position of 55 degrees abduction and 30 degrees horizontal adduction; a mobilizing force that glides the humeral head into the direction of restriction can help restore movement between the joint surfaces and lengthen fibers of the joint capsule
Ligaments
pgs. 148-149
Anterior deltoid
O- lateral third of clavicle
I- deltoid tuberosity
A- Shoulder abduction, flexion, medial(internal) rotation, horizontal adduction
N- Axillary nerve (C5, C6)
Middle deltoid
O- acromion process
I- deltoid tuberosity
A- shoulder abduction
N- axillary nerve (C5, C6)
Posterior deltoid
O- spine of scapula
I- deltoid tuberosity
A- shoulder abduction, extension, hyperextension, lateral(external) rotation, horizontal abduction
N- axillary nerve (C5, C6)
Pectoralis major (clavicular portion)
O- clavicle
I- lateral lip of bicipital groove of humerus
A-first 60 degrees of shoulder flexion
N- lateral and medial pectoral nerves (C5,6,7,8, T1)
Pectoralis major (sternal portion)
O- sternum, costal cartilage of first 6 ribs
I- lateral lip of bicipital groove of humerus
A-first 60 degrees of shoulder extension (from 180 to 120)
N- lateral and medial pectoral nerves (C5,6,7,8, T1)
Pectoralis major (clavicular and sternal portions actions together)
O- clavicle, sternum, and costal cartilage of ribs 1 to 6
I- lateral lip of bicipital groove of humerus
A- shoulder adduction, medial(internal) rotation, and horizontal adduction
N- lateral and medial pectoral nerves (C5,6,7,8, T1)
Latissimus dorsi
O- T7 through L5, sacrum, iliac crest, and lower 3 ribs
I- medial floor of bicipital groove of humerus
A- shoulder extension, adduction, medial(internal) rotation, hyperextension
N- thoracodorsal nerve (C6,7,8)
Teres major
O- inferior axillary border of scapula
I- medial lip of bicipital groove on the anterior surface of the humerus
A- shoulder extension, adduction, and medial(internal) rotation
N- lower subscapular nerve (C5,6,7)
Supraspinatus (most commonly injured)
O- supraspinous fossa of the scapula
I- greater tubercle of the humerus
A- shoulder abduction
N- suprascapular nerve (C5,6)
Infraspinatus
O- infraspinous fossa of scapula
I- greater tubercle of humerus
A- shoulder lateral(external) rotation, horizontal abduction
N- suprascapular nerve (C5,6)
Teres minor
O- axillary border of scapula
I- greater tubercle of humerus
A- shoulder lateral(external) rotation, horizontal abduction
N- axillary nerve (C5,6)
Subscapularis
O- subscapular fossa of the scapula
I- lesser tubercle of the humerus
A- shoulder medial(internal) rotation
N- upper and lower subscapular nerves (C5,6)
Coracobrachialis
O- coracoid process of the scapula
I- mid-humerus
A- stabilizes the shoulder joint
N- musculocutaneous nerve (C5,6,7)
Scapulohumeral rhythm
for every 2 degrees the shoulder joint abducts, the shoulder girdle upwardly rotates 1 degree, 2:1 ratio
Reverse muscle action during crutch walking
when arms are stabilized on the crutch handles, the pectoralis major and latissimus dorsi elevate the rib cage, sternum, and pelvis in allowing the body to swing through the crutches
Rotator cuff muscles (SITS muscles)
observing the distal attachments of the supraspinatus, infraspinatus, and teres minor muscles on the greater tubercle of the humerus they essentially form a line, these three muscles plus the subscapularis (above-ish the supraspinatus) are what forms the rotator cuff
subacromial space
common area for pathology, know the structures there, 38 minutes on anat shoulder
