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 Synovial joints are defined by the presence of a fluid-illed jolnt cavity,The aticuleting bony sarfaces are covered by a smooth layer of hyaline cartilage, known as the articular cartilage, which bs shock and reduces frietion dof strong fibrous connective tisue, is attached to each bone in the jolet and encloses called the synovial the joint cavity Lining the inside of the joint capsule is a thin layer of loose connective tisue membrane. It produces synovial fluld that is secreted into the ) absorption during movement. Accessory structures that strengthen and support synovial jodnts lIndlude ligaments bursae (singular bursa), menlsci (oingular - meniscus), and fat pads olnt cavity to provide lubrication and shock helt hs the greatet rng of motion odf ay joint in the body On a skeleton, examine the shoulder joint and identify the surfaces that are covered by articular cartilage Cut out a strip of paper that is S cm long and 0.5 cm wide On a skeleton o disarticulated scapula, wrap the paper strip around the glenoid cavity so that the edge extends about 3 mm position of the fibrocartilaginous ring called the glenold labrum. What do you think is the function of this beyond the rim. The paper strip approximates the Frontal section On a shoulder model, identify the foltlowing ligaments that support the shoulder The acromioclavicular ligament supports the superior aspect of the shoulder This ligament is actualy a part of the acromioclavicular (A) jint How would you classify the AC joint? The coracoclavicular ligaments help tabilise the clevidle. What type of fibrous joint do these ligarments form? pecces Bursa The coracoacromial ligament connects what two bone markings on the sapual p The coracohumeral ligament supports the superior aspect of the shoulder. To what structures does this ligament connect? - Humena Anterior view The glenohumeral ligaments support the anterior aspect of the shoulder identify their bony connections 144 EXERCISE 9 Articulations

Explanation / Answer

1. The articular cartilage covers the bony surface of joints such that those parts are covert which get attached/articulated with each other in every joint. In case of shoulder joint, The major surface that are covered by articualar cartilage are:

2. The glenoid labrum provides more covering area to the head of humerus. It is present in such a way that it provides mechanical depth to the shoulder joint. This function helps in increasing the stability of the joint along with allowing various movements in regard to the joint.

3. a. The acromio clavicular joint is a synovial joint because it has a synovial cavity. Further classifying, it is a type of plane synovial joint. It provides single or various movement across a plane.

b. The coracoclavicular ligament form a syndesmoses type of fibrous joint. It is because they are attached with dense connective tissue with very slight avaibility of movements.

c.The coracoacromian ligament has two attachments. One is the acromian process to which is attached the apex of the ligament. The base is attached to the lateral length of coracoid process.

d. The origin of coracohumeriod ligament is coracoid process. It rises and reaches down to tuberosities in two distint bancds. The anteriaor band attaches to lesser tuberosity and posterios to greater tuberosity.

e. The glenohumeral ligament can be divided into three seperate parts. The attachment on glenoid cavity is lower, medial and upper. The lower part attaches to anatomical neck of humerus. The medial attaches to the lesser tubercle.The upper is attached to the lesser tubercle.

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