ch 10- shoulder joint "glenohumeral joint" Flashcards
ball and socket joint with movement in all three planes and around all three axes; 3 degrees of freedom
shoulder joint “glenohumeral”
humeral head articulating with glenoid fossa of scapula
shoulder joint “glenohumeral”
most movable joint; least stable joint
shoulder joint “glenohumeral”
Joint motions: 1-flexion, extension, and hyperextension; 2-abdution and adduction; 3- medial and lateral rotation; 4- horizontal abduction and adduction; circumduction; scaption
shoulder joint “glenohumeral”
normal end feel for all shoulder joint motions because of tension due to ligaments and muscle in joint capsule
firm end feel
transverse plane/ vertical axis; 90 degrees of motion
medial and lateral rotation
arc of circle motion possible at shoulder; combination of all shoulder motions
circumduction
transverse plane/ vertical axis; 30 degrees of motion
horizontal abduction
transverse plane/ vertical axis; 120 degrees of motion
horizontal adduction
frontal plane/ sagittal plane; 180 degrees of motion
abduction and adduction
sagittal plane/ frontal axis; 180 degrees of motion
flexion and extension
sagittal plane/ frontal axis; 45 degrees from anatomical position
hyperextension
therapeutic shoulder exercises; 30 degrees forward from frontal plane (scapular plane); most functional movements
scaption
occurs in open packed position; 55 degrees of abduction and 30 degrees of horizontal adduction
greatest AK motion in shoulder joint
convex humeral head moves within the concave glenoid fossa of scapula
ak motion of shoulder joint
shoulder joint glides _____ of the roll/swing
opposite
humeral head glides posteriorly
medial rotation
humeral head glides anteriorly and superiorly
extension and adduction
humeral head glides posteriorly and inferiorly
flexion and abduction
humeral head glides anteriorly
lateral rotation
glide humeral head into direction of restriction between the joint surfaces and lengthen fibers of joint capsule
mobilizing force
shallow somewhat egg-shaped socket on superior end, lateral side; articulates with the humerus
glenoid fossa
fibrocartilaginous ring attached to the rim of the glenoid fossa, which deepens the articular surface
glenoid labrum
most area on the anterior (costal) surface, providing attachment for the subscapularis muscle
subscapular fossa
below the spine, provides attachment for the infraspinatus muscle
infraspinous fossa
above the spine, provides attachment for the supraspinatus muscle
supraspinous fossa
providing attachment for teres major and minor muscles
axillary border
broad, flat area on the superior lateral aspect, providing attachment for middle deltoid muscle
acromion process
longest and largest of upper extremity
humerus
semirounded proximal end; articulates with the scapula
head
slightly constricted area just below tubercles where the head meets the body
surgical neck
circumferential groove separating the head from the tubercle
anatomical neck
“body” the area between the surgical neck procimally and wider distal end
shaft
large projection lateral to head and lesser tubercle
greater tubercle
shoulder projection on anterior surface, medial to greater tubercle; provides attachment for the subscapularis muscle
lesser tubercle
on the lateral side near the midpoint of the shaft; not usually a well-defined muscle
deltoid tuberosity
“intertubercular groove”; the longitudinal groove between the tubercles; containing the tendon of the long head of biceps
bicipital groove
lateral and medial lips of bicipital groove, or crests of greater and lesser tubercles
bicipital ridges
lateral lip (crest of greater tubercle) provides attachment for
pectoralis major muscle
medial lip (crst for lesser tubercle) provides attachment for
latissimus dorsi and teres major
injury caused by a fall on outstretched hand; results in impacted fracture and common in elderly
humeral neck fracture
caused by direct blow or twisting force; increase risk for radial nerve injury
midhumeral fracture
b/c of midhumeral fracture since nerve passes next to bone in spiral groove
radial nerve injury
occurs at humerus; may be caused by benign tumors or metastatic carcinoma from primary sites such as lung, breast, kidney, prostate
pathological fracture
commonly seen in people who have hemiplegia usually from a cerebrovascular accident (stroke); paralysis of shoulder muscle leaves them no longer able to hold head of humerus in glenoid fossa; paralysis combined with pull of gravity and weight of arm overtime causes partial dislocation
gelnohumeral subluxation
most common joint dislocation; forced shoulder abduction and lateral rotation tends to be the dislocation motion causing the humeral head to slide anteriorly out of glenoid fossa
anterior shoulder dislocations
inflammation and fibrosis of shoulder joint capsule, which leads to pain and loss of ROM; frozen shoulder
adhesive capsulitis
involves distal tendinous insertion of supraspinatus, infraspinatus, teres minor, subscapularis on greater/lesser tubercle area of humerus
torn rotator cuff
overuse condition that involves compression between the acromial arch, the humeral head, and soft tissue structures- coracoacromial ligament, rotator cuff muscles, long head of biceps, and subacromial bursa; swimmers shoulder
impingement syndrom
damage to glenoid labrum; results in pain and limited motion in shoulder joint
labral tear
involves the long head of the biceps proximally as it crosses the humeral head, changes direction, and descends into bicipital groove; a rupture of biceps long head tendon commonly occurs during repetitive or forceful overhead positions
bicipital tendonitis
chronic inflammation of supraspinatus tendon can lead to an accumulation of mineral deposits; may be asymptomatic or quite painful
calcific tendonitis
overloading the muscle in an abducted and laterally rotated positions tends to be the force subluxing the tendon out of the bicipital groove
subluxing of biceps tendon
divides into superior, middle, inferior; reinforce the anterior portion of the capsule; pleated folds of capsule
glenohumeral ligaments
attaches from lateral side of coracoid process and spans the joint anteriorly to the medial side of greater tubercle; strengthens upper part of joint capsule
coracohumeral ligament
fibrous ring that surrounds the rim of glenoid fossa; function: deepen articular cavity
glenoid labrum
large and located between the deltoid muscle and joint capsule
subdeltoid bursa
lies below the acromion and coracoacromial ligament between them and joint capsule
subacromial bursa
tendinous band formed by the blending together of the tendinous instertions of the subscapularis, supraspinatus, infraspinatus, and teres minor; help keep head of humerus against the glenoid fossa during joint motion (rotating motion)
rotator cuff
thin-walled spacious container that attaches around the rim of the glenoid fossa and the anatomical neck of humerus
joint capsule
formed by outer fibrous membrane and inner synovial membrane
joint capsule
shoulder abducted: inferior portion is ____ and superior portion is _____
taut; slack
anatomical position: inferior portion is ____ and superior portion is _____
slack; taut
lumbar aponeurosis; superficial fibrous sheet that attaches to the spinous processes of lower thoracic and lumbar vertebrae, the supraspinal ligament, and posterior part of iliac crest, covering the sacrospinalis muscle
thoracolumbar fascia
provides broad attachment for the latissimus dorsi muscle
thoracolumbar fascia
completely surrounds joint and creates a vacuum to help hold the head against the fossa
joint capsule
glenoid fossa faces in an anterior, lateral, and upward direction. the purpose of upward direction is to
provide stability to joint
most muscles of shoulder joint originate on scapula, clavicle, or rib cage and insert on _____
humerus
muscles crossing anterior aspect of the joint have a ____ line of pull and ____ joint
vertical; flex
muscles crossing posterior aspect of joint have a _____ line of pull and ____ joint
vertical; extend
if the muscles crosses the superior/lateral aspect of the joint, it will ____
abduct
if the muscle crosses the inferior/medial aspect of joint, it will ____
adduct
if the muscles have a horizontal line of pull crossing posterior aspect of joint, it will ____
laterally rotate and horizontal abduct
if the muscles have a horizontal line of pull crossing anterior aspect of joint, it will _____
medially rotate and horizontal adduct
originates on trunk and insert on scapula causing movement or stabilization of scapula
shoulder girdle
originates on scapula or trunk and inserts on humerus causing movement of shoulder joint
shoulder joint
covers most superficial chest wall
pectoralis major
superficial cap over anterior, lateral, and posterior sides of shoulder
deltoid
covers most anterior and posterior arm
biceps and triceps brachii
deep in trapezius above scapula spine
supraspinatus
covers lumbar and thoracic regions of back
latissimus dorsi
infraspinatus, teres minor, teres major lie _____ scapular spine in descending order
below
lies deep to pectoralis major and anterior deltoid; lies medially to short head of biceps
coracobrachialis
deep muscle; runs horizontally through the axilla to proximal end of anterior humerus
subscapularis
the ak motions of spin, glide, and roll help with
keeping the humerus articulating with glenoid fossa
deltoid has a _____ line of pull and pulls ____ against acromion process
vertical; upward
humeral head rolls superiorly across glenoid fossa and glides inferior; accomplished by rotator cuff muscles
abduction
rotator cuff muscles are essential for ___
movement and stability
in addition to abducting, the supraspinatus _____
pulls head into glenoid fossa
shoulder abduction can only be performed if shoulder is _____
laterally rotated
subscapularis, infraspinatus, and teres minor pull head in and downward against glenoid fossa to counteract the upward pull of the ____
deltoids
shoulder laterally rotated then abduct; greater tubercle rotated from under acromion process- medially rotated or neutral
“open can”
medially rotate arm then abduct with thumb pointed down
empty can
anterior deltoid, pectoralis (clavicular) muscles perform
flexion
posterior deltoid, latissimus dorsi, teres major, pectoralis major (sternal) muscles perform ____
extension
latissimus dorsi, posterior deltoid perform
hyperextension
deltoid, supraspinatus perform
abduction
pectoralis major, teres major, latissimus dorsi perform
adduction
posterior deltoid, infraspinatus, and teres minor perform
horizontal abduction
pectoralis major, anterior deltoid perform
horizontal adduction
infraspinatus, teres minor, posterior deltoid perform
lateral rotation
latissimus dorsi, teres major, subscapularis, pectoralis major, anterior deltoid perform
medial rotation
____ coupled with ____ creates normal joint motion
ak motion; ok motion