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Shoulder jointallows lifting , pushing and pulling by upper extremity . Strong ligaments , muscles , and tendons support shoulder joint .
Skeletal System of Shoulder Joint
Glenohumeral Joint-
Glenohumeral joint is organise byclavicle , scapulaandhumerus . Glenohumeral joint radio link humerus ( bone of upper arm ) and scapula . Glenohumeral junction is a ball and socket roast formed by humerus sit on glenoid fossa of scapula . Smooth cartilages cover the surfaces of humerus and glenoid fossa . Most shoulder joint bowel movement are around Glenohumeral join .
Acromio-Clavicular Joint-
A second joint of the shoulder is Acromio - Clavicular join formed by the taking into custody bone and acromion unconscious process of shoulder blade . Acromio - clavicular joint participates in circular rotation of shoulder joint junction .
3D Video of Shoulder Joint Anatomy: Glenohumeral, Acromio-Clavicular Joints
Cartilages of Shoulder Joint
Articular Cartilage-
Shoulder joint has cartilage , which covers glenoid socket . The gristle is love as articular cartilage . Surface of gristle is smooth that allows movements of humerus with least friction . The rim of the gristle is known as labrum . Cartilage cushions glenoid socket and humerus . Labrum is form like a closed chain . Articulating cartilage creates a specific build to accommodate semi globe shape pass of humerus .
The Shoulder Labrum
Shoulder joint has a socket and a ball shaped head of humerus . Socket is circular in form and lip of socket is made up of gristle . The gristly rim of the socket is fuck as shoulder labrum . Labrum provides a depth to shallow socket of articulatio humeri junction thus providing constancy . Tendons and ligament are attached to labrum .
Shoulder Joint Capsule
Shoulder joint ejection seat introduce the ball and socket berm joint . Capsule surrounds and sequester to humerus , outer circumference of glomerular fossa cat or labrum , scapula and head of biceps . Capsule is made up of flimsy stringy and areolate tissue paper . Joint ejection seat is strengthened by multipleligaments and tendonsof berm stick . Inner open of capsule is covered by synovial membrane . Shoulder capsule sustain by synovial tissue layer from inside and ligament as well as sinew from outside keep the appropriate tension to provide optimal shoulder joint movements . easy condensation causes shoulder joint instability and wet ejector seat get frosty articulatio humeri .
Synovial Membrane
Synovial tissue layer get across at bottom of the capsule . Synovial membrane secretes viscous fluid , which enables a smooth multi - directive movement with least rubbing .
Ligaments of Shoulder Joint
Ligament is a set of tough fibrous tissue . Ligaments colligate and anchor the bones of shoulder joint . Tear or inflammation of ligament causes shoulder joint sprain .
Muscles and Tendons of Shoulder Joint
Severalmuscles and tendonof these muscle support shoulder articulation . Muscles end in tough fibrous tissue do it as tendon . Tendon is thus attached to muscles at one close and osseous tissue at opposite end . sinew contraction pulls the tendon and thus tendon pulls the bone of the joint where tendon is attach . The muscle contraction thus causes synchronized joint movement . firing of tendon is know astendonitis .
Rotator Cuff-
Group of four muscles of the seven shoulder joint muscles are live as rotator handlock . Rotator cuff muscleshold head of humerus against glenoid fossa and forbid subluxation . combat injury of any one of these sinew or tendon causes severe shoulderjoint paindiagnosed as rotator cuff syndrome .
Shoulder Joint Bursa
Shoulder stick has several bursas between protecting ligament and tendons . Bursa is situated between tendon and bone or ligament and bone or between tendon and ligament . Inflammation of bursa is known as bursitis . Most common bursitis observed issubacromial bursitis . Subacromial bursa is locate between acromial bone and Coraco - acromial ligament .
Shoulder Joint Movements
Shoulder joint motion involves head of humerus rotating and sliding in smooth shallow glenoid genus Fossa . Movement is known as ball and socket movement . Shallow glenoid fossa and loose abridgement allow wide range of mobility . Coordinated shoulder joint movements in several directions help oneself to fulfil highest calibre of sporting activities like baseball , football , tennis and hoops .
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