Shoulder Girdle

Which bone is located at the front of the shoulder girdle?

• Clavicle

• Scapula

• Humerus

• Sternum

Answer explanation

The clavicle, or collarbone, is located at the front of the shoulder girdle, connecting the arm to the body. It is positioned anteriorly, making it the correct answer compared to the scapula, humerus, and sternum.

Which two bones make up the Pectoral (shoulder) Girdle?

• clavicle

• scapula

• pelvis

• sternum

Answer explanation

The pectoral girdle consists of two bones: the clavicle and the scapula. The clavicle connects the arm to the body, while the scapula provides attachment for muscles and supports shoulder movement.

Which bone connects the shoulder girdle to the axial skeleton?

• Clavicle

• Scapula

• Humerus

• Sternum

Answer explanation

The clavicle, or collarbone, is the bone that connects the shoulder girdle to the axial skeleton, specifically to the sternum. The scapula and humerus are part of the shoulder joint, while the sternum is not directly connected to the shoulder girdle.

What is the anatomical term for the collarbone?

• Clavicle

• Scapula

• Humerus

• Sternum

Answer explanation

The anatomical term for the collarbone is 'clavicle'. The other options refer to different bones: scapula is the shoulder blade, humerus is the upper arm bone, and sternum is the breastbone.

What is another name for the lateral margin of the scapula?

• Vertebral border

• Axillary border

• Superior border

• Inferior border

Answer explanation

The lateral margin of the scapula is known as the axillary border. This border is opposite the vertebral border, which is the medial margin, while the superior and inferior borders refer to the top and bottom edges, respectively.

Which margin of the scapula is known as the superior margin?

• Top margin

• Bottom margin

• Side margin

• Middle margin

Answer explanation

The superior margin of the scapula is referred to as the top margin. This is the edge that is positioned highest when the scapula is in its anatomical position.

Which ligament provides support for the superior surface of the shoulder?

• Coracohumeral ligament

• Acromioclavicular ligament

• Transverse humeral ligament

• Coracoacromial ligament

Answer explanation

The acromioclavicular ligament supports the superior surface of the shoulder by connecting the acromion of the scapula to the clavicle, providing stability to the shoulder joint.

What is the outer rim of the glenoid fossa surrounded by?

• A fibrous capsule

• A fibrocartilaginous ring

• A muscular sheath

• A synovial membrane

Answer explanation

The outer rim of the glenoid fossa is surrounded by a fibrocartilaginous ring, known as the labrum, which deepens the socket and provides stability to the shoulder joint.

Tags

NGSS.MS-LS4-2

What fills the bursae in the shoulder joint?

• Blood

• Synovial fluid

• Bone marrow

• Muscle tissue

Answer explanation

The bursae in the shoulder joint are filled with synovial fluid, which acts as a lubricant to reduce friction between the bones and soft tissues during movement. This is essential for smooth joint function.

Which muscle group is responsible for the movement of the scapula?

• Muscles of the upper arm

• Muscles of the scapula

• Muscles that connect the upper extremity to the vertebral column

• Muscles that connect the upper extremity to the anterior thoracic wall

Answer explanation

The muscles of the scapula, such as the trapezius and serratus anterior, are specifically responsible for the movement of the scapula, allowing for actions like elevation, depression, and rotation.