Scapular region which clavicle connects

At the lateral end this smaller surface articulates with the scapula. On the underside, massive ligaments are attached, here laterally, and here medially. The scapula is a much more complicated bone. The flat part, or blade, is roughly triangular with an upper border, a lateral border, and a medial border. The blade isn't really flat, it's a little curved to fit the curve of the chest wall. This smooth concave surface is the glenoid fossa.

It's the articular surface for the shoulder joint. Above and below the glenoid fossa are the supraglenoid tubercle, and the infraglenoid tubercle, where two tendons are attached, as we'll see.

A prominent bony ridge, the spine of the scapula, arises from the dorsal surface, and divides it into the supraspinous fossa, and the infraspinous fossa. At its lateral end the spine gives rise to this flat, angulated projection, the acromion, which stands completely clear of the bone.

The clavicle articulates with the scapula here, at the tip of the acromion. This other projection, looking like a bent finger, is the coracoid process. Here's how the clavicle and the scapula look in the living body. Round the edge of the shallow glenoid fossa, a rim of fibrocartiilage, the glenoid labrum, makes the socket of the shoulder joint both wider and deeper.

This flat ligament, the coraco-acromial ligament, joins the coracoid process to the acromion. Here's the acromio-clavicular joint. Two strong ligaments, the trapezoid in front and the conoid behind, fix the underside of the clavicle to the coracoid process.

This end is also anchored to the coracoid process of the scapula by the coracoclavicular ligament, which provides indirect support for the acromioclavicular joint. The clavicle supports the scapula, transmits the weight and forces from the upper limb to the body trunk, and protects the underlying nerves and blood vessels.

The scapula lies on the posterior aspect of the pectoral girdle. It mediates the attachment of the upper limb to the clavicle, and contributes to the formation of the glenohumeral shoulder joint. This triangular bone has three sides called the medial, lateral, and superior borders. The suprascapular notch is located on the superior border. The scapula also has three corners, two of which are the superior and inferior angles.

The third corner is occupied by the glenoid cavity. Posteriorly, the spine separates the supraspinous and infraspinous fossae, and then extends laterally as the acromion.

The subscapular fossa is located on the anterior surface of the scapula. The coracoid process projects anteriorly, passing inferior to the lateral end of the clavicle. Name the short, hook-like bony process of the scapula that projects anteriorly. The clavicle extends laterally across the anterior shoulder and can be palpated along its entire length. At its lateral end, the clavicle articulates with the acromion of the scapula, which forms the bony tip of the shoulder. The acromion is continuous with the spine of the scapula, which can be palpated medially and posteriorly along its length.

Together, the clavicle, acromion, and spine of the scapula form a V-shaped line that serves as an important area for muscle attachment. Discuss two possible injuries of the pectoral girdle that may occur following a strong blow to the shoulder or a hard fall onto an outstretched hand.

A blow to the shoulder or falling onto an outstretched hand passes strong forces through the scapula to the clavicle and sternum. A hard fall may thus cause a fracture of the clavicle broken collarbone or may injure the ligaments of the acromioclavicular joint. Skip to content The Appendicular Skeleton. Learning Objectives By the end of this section, you will be able to: Describe the bones that form the pectoral girdle List the functions of the pectoral girdle.

Axial and Appendicular Skeletons. The axial skeleton forms the central axis of the body and consists of the skull, vertebral column, and thoracic cage. The appendicular skeleton consists of the pectoral and pelvic girdles, the limb bones, and the bones of the hands and feet. The pectoral girdle consists of the clavicle and the scapula, which serve to attach the upper limb to the sternum of the axial skeleton. Clavicle The clavicle is the only long bone that lies in a horizontal position in the body see Figure.

Scapula The scapula is also part of the pectoral girdle and thus plays an important role in anchoring the upper limb to the body. The isolated scapula is shown here from its anterior deep side and its posterior superficial side. Chapter Review The pectoral girdle, consisting of the clavicle and the scapula, attaches each upper limb to the axial skeleton. Review Questions Which part of the clavicle articulates with the manubrium? Which feature lies between the spine and superior border of the scapula?

What structure is an extension of the spine of the scapula? Critical Thinking Questions Describe the shape and palpable line formed by the clavicle and scapula. Previous: Introduction.

Next: Bones of the Upper Limb. Share This Book Share on Twitter. Left Clavicle : The left clavicle, viewed from above.

Muscle attachment sites pectoralis major, subclavius muscle, deltoid, and sterno-hyoid are highlighted. Medially the clavicle is quadrangular in shape and articulates with the manubrium of the sternum forming the sternoclavicular joint. Laterally, the clavicle is flattened and attaches to the acromion process of the scapula forming the acromioclavicular joint. The shaft of the clavicle acts as the origin and attachment point for numerous muscles and ligaments. At the medial end of the shaft the pectoralis major originates from the anterior surface, the posterior surface gives origin to the sternohyoid muscle and the superior surface the sternocleidomastoid muscle.

Laterally the deltoid muscle originates from the anterior surface and the trapezius muscle attaches to the posterior surface at the trapezoid line. Adjacent to this is the conoid tubercle which is an attachment point for the conoid ligament.

The scapula, or shoulder bone, is a flat, triangular bone that connects to the humerus and the clavicle. The scapula, or shoulder blade, is a flat, triangular bone located to the posterior of the shoulder.

The scapula articulates with the clavicle through the acromion process, a large projection located superiorly on the scapula forming the acromioclavicular joint. The scapula also articulates with the humerus of the upper arm to form the shoulder joint, or glenohumeral joint, at the glenoid cavity. Due to its flat nature, the scapula presents two surfaces and three borders; the front-facing costal surface and the rear-facing dorsal surface, as well as the superior, lateral, and medial borders.

Costal surface : Costal surface of the left scapula. The subscapular fossia for subscapularis, serratus, pector minor regions are highlighted. The serratus anterior originates from the costal surface, which also provides an attachment for the subscapularis muscle.