MS Bones And Joints Of Shoulder Girdle Flashcards
GH joint articulating surfaces
Glenoid fossa of scapula within the head of the humerus
GH joint classification
Structural: Multi-axial, ball and socket, synovial joint
Functional: Diarthrodial
GH movements permitted
Abduction/adduction
Flexion/extension
Horizontal abduction/adduction
Internal/external rotation
GH ligaments
Capsule
GH ligament
Coracohumeral ligament
Transverse humeral ligament
Coracocrominal ligament
GH bursae and labrum
GH labrum
Subdeltoid bursa
Subocranial bursa
Subscapular bursa
Capsule (GH)
Axillary recess
Lax in adduction, taught in abduction
Glenohumeral ligament
Partially capsular, anterior
Z-shaped with three bands: superior, middle, interior
Limits external rotation and horizontal abduction
Coracohumeral ligament
GH
Extracapsular
2 bands: superior, inferior
Helps support dependent arm against gravity
Transverse humeral ligament
GH
Extracapsular
Anchors long head of biceps tendon within the intertubular sulcus
Coracoacromial ligament
GH
Extracapsular
Band arches over GH joint
Forms portion of roof of subacromial arch
Limits elevation of the humerus/ superior displacement of head of humerus
Contributes to coracoacromial arch
GH labrum
Intracapsular
Lines glenoid fossa to deepen thus increasing congruency
Subdeltoid bursa
GH
Sits between the acromian and proximal humerus and deltoid
Subocranial bursa
GH
Between acromion and supraspinatus tendon
Subscapular bursa
GH
Between glenohumeral ligament/anterior joint capsule and subscapularis tendon
Acromioclavicular joint articulating surfaces
Acromial facet of clavicle
Clavicular facet of acromion (medial acromion)
AC joint classification
Structural: non axial, plane, synovical
Functional: diarthrodial
AC movements permitted
Superior/inferior scapular rotation
Scapular protraction/retraction
Upward tip/anterior tilt
AC ligaments
Capsule
Acromioclavicular ligaments
Coracoclavicular ligaments ( Conoid and Trapezoid)
Superior transverse scapular ligament
Capsule (AC)
Relatively weak
Within is a disc, often absent by age 40
Acromioclavicular ligament
Extracapsular
Superior and inferior bands
Limit one bone over riding another
Coracoclavicular ligament ( Conoid and Trapezoid)
AC
Extra capsular
Trapezoid attaches lateral
Conoid attaches medial
Helps disperse force in a FOOSH
Superior transverse scapular ligament
AC
Extra capsular
Doesn’t cross a joint
Spans the suprascapular notch
Sternoclavicular joint articulating surfaces
Sternal facet of the clavicle and costo cartilage of rib 1 with the superolateral manubrium /clavicular facet
AC joint classification
Structural: biaxial, saddle, synovial
Functional: Diarthrodial
AC movements permitted
Clavicular elevation/depression
Clavicular protraction/retraction
Clavicular rotation
SC ligaments
Capsule
Sternoclavicular ligament
Costoclavicular ligament
Interclavicular ligament
Capsule (SC)
Lax and thin above and below joint
Disc (intra-capsular) attached to the clavicle superiorly and costocartilage of rib 1 inferiorly
The disc divides the SC into 2 joint spaces: medial and lateral
Function of the disc: shock absorption
Sternoclavicular ligament
SC
Extra capsular
Two bands: Anterior and posterior
Limit anterior/posterior clavicular movement
Costoclavicular ligament
SC
Extracapsular
Goes from Costco cartilage of rib 1 to inferior clavicle
Limits clavicular motion at 90° GH abduction
Interclavicular ligament
SC
Extra capsular
Spans sternal notch
Limit superior and inferior clavicular displacement
