What is the purpose of the pectoral girdle?

What is the purpose of the pectoral girdle?

Your pectoral girdles are responsible for providing structural support to your shoulder region on the left and right side of your body. They also allow for a large range of motion, connecting muscles necessary for shoulder and arm movement.

What is the main action of the muscles of the pectoral girdle?

The posterior muscles of the pectoral girdle work to elevate the shoulders, retract (pull together) the scapula, move the arm, and assist in pulling the head back. The major muscles in the pectoral girdle on the posterior side of the body are the rhomboid major and minor and the trapezius.

Why is the pectoral girdle more free?

Why is the pectoral girdle more free than the pelvic girdle? The pectoral girdle attaches the upper limbs to the thorax through fibrous and muscular, and cartilagenous attachments. It is is not firmly and inflexibly anchored to the upper thorax as the pelvic girdle is to the sacrum.

What does the pectoral girdle consist of?

The shoulder, or pectoral, girdle is composed of the clavicles (collarbones) and the scapulae (shoulder blades). In humans the clavicles join the sternum (breastbone) medially and the scapulae laterally; the scapulae, however, are joined to the trunk only by muscles.

What is the function of the pectoral girdle quizlet?

This part of the skeleton wraps around the upper portion of the thoracic cage. It serves as the support structure for the upper limb.

What muscles stabilize the pectoral girdle?

The muscles that position and stabilize the pectoral girdle are located on the thorax. The anterior thoracic muscles are the subclavius, pectoralis minor, and the serratus anterior. The posterior thoracic muscles are the trapezius, levator scapulae, rhomboid major, and rhomboid minor.

What stabilizes the pectoral girdle?

Is the pectoral girdle flexible?

The pectoral girdle prioritizes flexibility and is able to do so because of its insecure axial and limb attachments. Additionally, it is a lightweight joint. The pelvic girdle is much more stable than it is mobile because its main function is to bear weight.

Is pectoral girdle stable?

The clavicle and scapula make up the pectoral girdle, which provides a stable origin for the muscles that move the humerus. The muscles that position and stabilize the pectoral girdle are located on the thorax.

What is the function of pectoral and pelvic girdles?

The pectoral girdle stabilizes the upper limbs on the thorax and allows a range of mobility at the shoulder. Malformations impair these functions and distort the appearance of the upper chest and back. The pelvic girdle transfers upper body weight to the lower limbs by articulating with the spine.

Is the pectoral girdle stable?

What do the pectoralis muscles do?

The pectoralis major extends across the upper part of the chest and is attached to a ridge at the rear of the humerus (the bone of the upper arm). Its major actions are adduction, or depression, of the arm (in opposition to the action of the deltoideus muscle) and rotation of the arm forward about the axis of the body.