Depression in the scapula that articulates with the humerus. Humerus 2022-10-23
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Depression in the scapula, also known as scapular depression, is a condition in which the scapula, or shoulder blade, sinks down lower than normal in relation to the humerus, or upper arm bone. This can cause a number of problems, including pain, difficulty with arm movement, and impaired function in daily activities.
Scapular depression is often caused by muscle imbalances in the shoulder and back, as well as poor posture. In many cases, it is a result of overuse or repetitive strain injuries, such as those sustained by athletes or individuals who perform repetitive tasks with their arms. It can also be caused by poor technique when lifting weights, leading to muscle strains and imbalances.
Treatment for scapular depression typically involves physical therapy and exercises to correct muscle imbalances and improve posture. This may include stretches, strengthening exercises for the back and shoulder muscles, and exercises to improve overall body alignment. In severe cases, surgery may be necessary to correct the position of the scapula.
Preventing scapular depression involves maintaining good posture, taking frequent breaks to stretch and rest the shoulders, and using proper technique when lifting weights or performing tasks that involve repetitive arm movements. It is also important to address any muscle imbalances or weaknesses that may be contributing to the condition.
Overall, scapular depression can be a frustrating and painful condition, but with proper treatment and prevention techniques, it can be managed and resolved. It is important to seek medical attention if you are experiencing pain or difficulty with arm movement, as early intervention can improve outcomes and prevent further complications.
The Pectoral Girdle
The ball and socket joint or spheroid joint is a type of synovial joint in which the ball-shaped surface of one rounded bone fits into the cup-like depression of another boneā¦. The medial border faces towards the middle of the body. Together, the clavicle, acromion, and spine of the scapula form a V-shaped line that serves as an important area for muscle attachment. With our Surfaces The scapula has two surfaces; on the anterior aspect is the smooth costal surface, which is concave in shape and is majorly taken up by the subscapular fossa. Permitting movement in all directions, the ball and socket joint features the rounded head of one bone sitting in the cup of another bone. When the elbow is in the extended position, the posterior and inferior aspects of the trochlea are in contact with the ulna. It performs elevation and retraction of the scapula.
Anatomy ā Parts of Scapula The body of the scapula consists of a triangular-shaped flat blade, with an apex pointed below. The ball part of this joint is the top of the thighbone femur. The right and left pectoral girdles are not joined to each other, allowing each to operate independently. The borders of the scapula are also given proper names. This process extends superiorly to articulate with the clavicle. Thus, all movements of the arm involve movement or stability provided by the scapula.
depression in the scapula that articulates with the humerus glenoid cavity
The radial groove is a shallow groove that interrupts the lateral border in its medial third. In this test, the doctor will test your arm strength by pushing down on your extended arm. The medial end, known as the sternal end of the clavicle, has a triangular shape and articulates with the manubrium portion of the sternum. Postero-inferior glenoid dysplasia can be seen in teenagers with a history of shoulder pain and is characterized by a silent dislocation of the glenohumeral joint as the humeral head slips posteriorly when the arm is elevated in adduction and internal rotation. At its lateral end, the clavicle articulates with the acromion of the scapula, which forms the bony tip of the shoulder. Another way to identify the side is to observe which side the glenoid cavity is facing.
It is supplied via the dorsal scapular nerve. The scapula also has three corners, two of which are the superior and inferior angles. They help in elevating the scapula. Most of the rotator cuff muscles of the shoulder arise from here. If your symptoms persist, it is important to contact your doctor. The muscle is innervated by the Mnemonic Of these muscles some retract and some protract the scapula and there is a very easy way to remember them! What is a ball-and-socket joint give an example? It helps to elevate and rotate the scapula during protraction of the humerus beyond 90 degrees. It arches over the glenohumeral joint and articulates with the lateral acromial end of the clavicle to make up the synovial acromioclavicular joint.
Extending laterally from the spine is a flattened and expanded region called the acromion or acromial process. The acromial end of the clavicle articulates with the acromion of the scapula at the acromioclavicular joint. American Academy of Orthopaedic Surgeons, 2003, p. It also bears the glenoid cavity, which articulates with the rounded head of the humerus, forming the shoulder joint or glenohumeral joint. It performs a variety of actions, such as adduction, extension and medial rotation at the shoulder joint. Morphological changes of the scapula can also be seen in infants featuring a brachial plexus injury at the time of delivery due to an abnormal development of the cartilage of the posterior glenoid. To do this, pull your shoulder blades back together, and bend your elbows down and back as if you are trying to put them in your back pockets.
It protracts, rotates, and stabilizes the scapula. In the center, it is convex, while near the lateral border, it has a deep groove running from the upper toward the lower part. Four muscles, namely subscapularis, infraspinatus, teres minor, and supraspinatus, form the rotator cuff, covering the shoulder capsule. During flexion of the elbow, the radial fossa. Both of these bones serve as important attachment sites for muscles that aid with movements of the shoulder and arm. This is due to the ball-in-socket joint that is created via the articulation of the humerus and scapula.
Which bone connects with the humerus at the ball-and-socket joint? In patients with scapular dyskinesis, muscle strength will improve when the shoulder blade is retracted. The acromion is continuous with the spine of the scapula, which can be palpated medially and posteriorly along its length. They reside in the shoulder region and sit laterally to the spine. Infraspinous fossa: It is the area below the spine of the scapula. A blow to the shoulder or falling onto an outstretched hand passes strong forces through the scapula to the clavicle and sternum. It is concave, smooth, and broader at its vertebral than at its humeral end. The suprascapular notch is located on the superior border.
This forms the sternoclavicular joint, which is the only bony articulation between the pectoral girdle of the upper limb and the axial skeleton. Your doctor will perform strength testing of your shoulder and scapular muscles to determine if muscle weakness is contributing to the abnormal scapular motion. The two articulating bones, the clavicle and humerus, are more likely to fracture than the scapula itself. This triangular bone has three sides called the medial, lateral, and superior borders. The bone fragments usually unite easily as the humerus has a well-developed Intercondylar fracture An intercondylar fracture can occur due to a fall on the elbow whilst it is in flexion. The shaft is triangular in capitulum and olecranon fossa, behind and above the trochlea, and the coronoid fossa, in front and aboveāreceive. It is surrounded by muscles on both its anterior deep and posterior superficial sides, and thus does not articulate with the ribs of the thoracic cage.
