Activity 9.8 Synovial Joints: Examining the Structure of Synovial Joints in the

Question

Activity 9.8 Synovial Joints: Examining the Structure of Synovial Joints in the Upper Limb ynovial joints are defined by the presence of a fluid-filled jolnt cavity. The articulating bony surfaces are covered y a smooth layer of hyaline cartilage, known as the articular cartilage, which absorbs shock and reduces friction. A joint cepsule, composed of strong flbeous connective tissue, is attached to each bone in the jolnt and endloses the joint cavity Lining the inside of the jolnt capsule is a thin layer of loose connective tissue called the synovial membrane. It produces synovial fluld that is secreted into the joint cavity to provide labrication and shodk absorption during movement. Accessory sto bersae (singular bursa), meniscl (singular- meniscus), and fat pads y structures that strengthen and opport ynowial ¡oints include ligament, The shoulder joint has the greatest range of motion of any joint in the body. 0 On a sieleton, ecamine the shoulder joint and identily the surfaces that ave covered by articular cartilage Cut out a strip of paper that is 5 cm long and 05 cm wide. On a skeleton or disarticulated scapula, wrap the paper strip around the glenoid cavity so that the edge extends about 3 mm beyond the rim. The paper strip approximates the position of the fibrocartilaginous ring called the glemold labrum. What do you ink is the function of this structure Frontal section On a shoulder model, identify the following ligaments tht upport the shoulder The acromioclavicular ligament supports the superior aspect of the shoulder This iygament is actualy part of the acromioclavicular (AC) joint. How would you classily the AC joint? The coracoclavicular ligaments help stabilize the clavicle. What type of fibrours joint do these ligaments form? ointCoracod The coracoacromial ligament connects what two bone markings on the scapula? process Bursa The coracohumeral ligament supports the superior aspect of the shoulder. To what structures does this ligament connect? Humerus Anterior view The glenohumeral ligaments support the anterior aspect of the shoulder dentifly their bony connections 144

Explanation / Answer

synovial joint in upper limb- it is also knpwn as diarthrosis,which is joined by fibrous tissue it is filled by synovial fluid.Planar, hinge, pivot, condyloid, saddle, and ball-and-socket are all types of synovial joints.

answers-

1.the surface covered by articulate cartilage are head of humerus.

2.function of glenoid labrum- it is the fibrocartilage (rubbery tissue) which is place in the limb which also help to maintain the grip of ball in the joint of socket,The labrum deep the glenoid cavity and effectively increases the surface of the shoulder joint.

3.AC joint- AC is a joint at the top of the shoulder. It is the junction between the acromion (i.e part of the scapula that forms the highest point of the shoulder) and the clavicle.it help to raise the arm above the head.

Coracoacromial ligament: it is the ligament of shoulder which forms the tough fibrous connective tissue that connect bones.they form the synovial layer coating the ligament's fibrous core.

glenohumeral joint-- it is the ball and the socket joint between the scapula and humerous bones.it is the major joint which connect the upper limb to the trunk of the body.

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