The pectoral girdle, also known as the shoulder girdle, is a bony structure that helps to support the upper limbs and attach them to the trunk of the body. It consists of two bones, the scapula and the clavicle.
The scapula, or shoulder blade, is a flat triangular bone located on the back of the shoulder. It has a number of important functions, including providing attachment points for muscles that move the arm and helping to stabilize the shoulder joint. The scapula also plays a role in protecting the thoracic cavity, as it forms part of the ribcage.
The clavicle, or collarbone, is a long, slender bone that extends from the top of the sternum (breastbone) to the acromion, a bony projection on the scapula. The clavicle helps to support the weight of the upper limb and acts as a strut to hold the shoulder blade away from the trunk of the body. It also helps to protect the major blood vessels and nerves that pass through the shoulder region.
Together, the scapula and clavicle form a stable and flexible connection between the upper limb and the trunk, allowing for a wide range of movements of the arm and shoulder. Injuries to the pectoral girdle, such as fractures of the clavicle or dislocated shoulder, can have significant impacts on mobility and function.
In summary, the pectoral girdle consists of the scapula and clavicle, two bones that play important roles in supporting and moving the upper limbs, protecting the thoracic cavity, and maintaining the stability of the shoulder joint.
Pectoral Girdle (Shoulder Girdle) Anatomy and Function
Most of them have capacity of locomotion. The corners of the triangular scapula, at either end of the medial border, are the superior angle of the scapula, located between the medial and superior borders, and the inferior angle of the scapula, located between the medial and lateral borders. A hard fall may thus cause a fracture of the clavicle broken collarbone or may injure the ligaments of the acromioclavicular joint. First, anchored by muscles from above, it serves as a strut that extends laterally to support the scapula. The sternal end is also anchored to the first rib by the costoclavicular ligament.
The Pectoral Girdle Flashcards
The humerus, radius, and ulna are typical of the mammalian family. The scapulothoracic joint permits gliding movements of the scapula around the fulcrum of the acromioclavicular joint. Such breaks often occur because of the force exerted on the clavicle when a person falls onto his or her outstretched arms, or when the lateral shoulder receives a strong blow. This ridge extends out laterally, where it forms the bony tip of the shoulder and joins with the lateral end of the clavicle. The bones that attach each lower limb to the axial skeleton form the pelvic girdle; the bones that attach each upper limb to the axial skeleton form the pectoral girdle. Scapular and clavicular injuries are common. On the posterior aspect, the spine of the scapula is a long and prominent ridge that runs across its upper portion.
Comparison of Pectoral Girdles in Various Vertebrates
As discussed above, the shoulder girdle is a bony structure constituting the clavicle and scapula to connect the axial and appendicula skeletons. There are some sex differences in the morphology of the clavicle. Each of the two pectoral girdles consists of a clavicle and a scapula. The clavicle is the most commonly fractured bone in the body. The next portion that is joined to the epicoracoid is he mesosternum, which bears a broad, flate palte, the xiphoid cartilage, at the hinder end. Both the halves are identical and they meet at their ventral margins.
Pectoral Girdle: Anatomy, Function, and Treatment
Therefore, the pelvic and pectoral girdles act as a bridge connecting the axial skeleton to the appendicular skeleton. The lateral end of the clavicle articulates joins with the scapula just above the shoulder joint. The three joints of the shoulder girdle are constructed to allow a wide range of arm movement, at the expense of stability. Pectoral girdle Your body is comprised of joints, muscles, and structures that connect one bone to the next. The scapula shoulder blade lies on the posterior aspect of the shoulder. For acromioclavicular and sternoclavicular joint sprains or dislocations, you may need to wear a shoulder sling for two to six weeks depending on the severity of the injury.
Pectoral (Shoulder) Girdle: Names of Bones, Functions, & Diagram
The joint lies at the center of the chest, just over the first rib. The lateral or acromial end of the clavicle articulates with the acromion of the scapula, the portion of the scapula that forms the bony tip of the shoulder. Lesson Summary In this lesson, we discussed the general structure and function of the pectoral girdle shoulder girdle. The pectoral girdle is formed by the scapula and humerus. This forms the sternoclavicular joint, which is the only bony articulation between the pectoral girdle of the upper limb and the axial skeleton. The remaining corner of the scapula, between the superior and lateral borders, is the location of the glenoid cavity glenoid fossa. Pectoral Girdle: This is the amalgamation of bones that attach the upper limb to the body.
