How many bones are in the pectoral girdle?

How many bones are in the pectoral girdle?

The bones that attach each upper limb to the axial skeleton form the pectoral girdle (shoulder girdle). This consists of two bones, the scapula and clavicle ( Figure 8.1.1 ).

Is the scapula part of the pectoral girdle?

The pectoral girdle consists of the clavicle and the scapula, which serve to attach the upper limb to the sternum of the axial skeleton. The scapula (shoulder blade) lies on the posterior aspect of the shoulder. It is supported by the clavicle, which also articulates with the humerus (arm bone) to form the shoulder joint.

What attaches the pectoral girdle to the sternum?

The pectoral girdle, consisting of the clavicle and the scapula, attaches each upper limb to the axial skeleton. The clavicle is an anterior bone whose sternal end articulates with the manubrium of the sternum at the sternoclavicular joint. The sternal end is also anchored to the first rib by the costoclavicular ligament.

Why is the clavicle important to the upper limb?

This allows for the extensive mobility of the entire pectoral girdle, which in turn enhances movements of the shoulder and upper limb. The clavicle is the only long bone that lies in a horizontal position in the body (see Figure 8.1.1 ). The clavicle has several important functions.

What muscles stabilize the pectoral girdle?

Figure 11.22 Muscles That Position the Pectoral Girdle The muscles that stabilize the pectoral girdle make it a steady base on which other muscles can move the arm. Note that the pectoralis major and deltoid, which move the humerus, are cut here to show the deeper positioning muscles.

Is the pectoralis major an axial muscle?

Similar to the muscles that position the pectoral girdle, muscles that cross the shoulder joint and move the humerus bone of the arm include both axial and scapular muscles ( Figure 11.23 and Figure 11.24 ). The two axial muscles are the pectoralis major and the latissimus dorsi.

What are the bones of the upper limb?

Upper limb. ■ Bones of arm: HUMERUS (the long bone of the upper arm) ■ Bones of forearm: RADIUS (lateral bone of the forearm) and ULNA (medial bone of the forearm) ■ Bones of the hand: CARPALS (wrist), METACARPALS (hand), and PHALANGES (finger bones) Please Note: Pectoral girdle consists of two bones CLAVICLE, SCAPULA.