Shoulder region and arm I Flashcards Preview

Upper limb anatomy > Shoulder region and arm I > Flashcards

Flashcards in Shoulder region and arm I Deck (20)
Loading flashcards...

what constitutes the upper limb

shoulder, arm, forearm, hand


what is the pectoral girdle

bit which connects the upper limb to the thorax


Which bones make up the pectoral girdle and list its features and be able to label

Clavicle-acromial facet, trapezoid line, conoid tubercle, subclavian groove, sternal facet. Long bone but no medullary (marrow) cavity, trabecular surrounded by compact shell
Manubrium sterni
Scapula-superior, lateral and medial border, superior, inferior and lateral angle, suprascapular notch, glenoid cavity (articulation site humerus), neck, acromion (clavicle articulation), coracoid process, supraspinous fossa, infraspinous fossa, spine


Sternoclavicular joint attachment

clavicle connected to manubrium by anterior sterno-clavicular lig. anatomically a saddle joint but functionally a synovial ball and socket joint
Costoclavicular lig. attach clavicle to 1st rib


Acromio-clavicular joint attachment

the coracoclavicular ligaments (trapexoid and conoid ligament) attach to clavicle. Conoid lig. attach to conoid tubercle
acromioclavicular lig. attach acromium to clavicle
incomplete articular disc, no muscles connect articulating bone


What are the range of movements of the scapulothoracic joint

elevation, depression,retraction, protracction, upward rotation, downward rotation (this is a physiological join, it doesn't properly articulate


What are the deep (state where arise) and superficial back muscles and its function

Deep: levator scapulae C1-4, rhomboid minor C7-T1, rhomboid major T2-T5, These attach to medial border of scapula and elevate, retract and rotate scapula. Serratus anterior attach to lateral border of scapula to 1-9th rib, protracts and rotates scapula (boxer's muscle).
Superficial: trapezius elevates, retracts and depresses scapula, latissimus dorsi (connects vertebra to upper limb) extends, adducts, medially rotates the humerus (GH joint) e.g. chin ups, pull ups


What are the 3 parts of pec major

clavicular head, sternocostal head, abdominal part


What does poland's syndrome involve

very little pec major


what are the deep anterior axio-appendicular muscles

subclavius (rib3-5 attachment), pectoralis minor


What are the movements of the glenohumeral joint

abduction, adduction, flexion, extension, medial rotation, lateral rotation, circumduction


When you raise arm, what needs to rotate and to what extent

Iniially 60 deg scapula rotation followed by 120deg glenohumeral joint


Label the gleno-humeral joint and its articulation. List functions of features

ref. notes
subacromial bursa allows smooth movement, prevents ligament and bone grating
acromion=protective structure for shoulder
glenoid labrum=lid of articular cartilage
articular capsule=bulging out for abduction and arm up, otherwise tear


Why is the head of humerus bigger than glenoid cavity

decreasing articular surface allows for greater freedom of movement. The stability is sacrificed


List and label the lig. supporting the gleno-humeral joint

coracoclavicular, coraco acromial, acromioclavicular, coracohumeral (covered by fibrous capsule), glenohumeral (superior, middle, inferior)


What are the muscles at the glenohumeral joint

deltoid, supraspinatus, infraspinatus, teres major, teres minor, subscapularis


What are the functions of the deltoid muscle

clavicular (anterior)->flex and medially rotate arm
acromial (middle)->abduct arm
spinal (posterior)->extends and laterally rotate arm
engage all 3 for max abduction


What are the functions of the following posterior muscles at the GH joint: supraspinatus, teres minor, teres major, infraspinatus

Supraspinatus-initiates abduction of arm
teres minor-laterally rotates arm
teres major-medially rotates arm
infraspiantus-laterally rotates arm


What does the subscapularis do and where is it

On anterior surface and it medially rotates arm


What constitutes the rotator cuff muscle

SITS (supraspinatus, infraspinatus, teres minor, subscapularis) coracoacromial arch gives degree of stability