Question

Which one of the following statements is true?

• A. Head of the humerus bone articulates with the acetabulum of the pelvic girdle.
• B. Head of the humerus bone articulates with a glenoid cavity of pelvic girdle.
• C. Head of the humerus bone articulates with the glenoid cavity of the pectoral girdle
• D. Head of the humerus bone articulates with the acetabulum ofthe pectoral girdle

Answer 1

The correct option is C Head of the humerus bone articulates with the glenoid cavity of the pectoral girdle

Humerus:

• Humerus is a long bone of the upper limb
• The proximal end of the humerus articulates with the glenoid cavity of the pectoral girdle.

Pectoral girdle:

• Pectoral girdle is also called the shoulder girdle.
• It consists of the scapula and the clavicle.
• The region where the superior and lateral border of the scapula meets the glenoid cavity is formed.

Pelvic girdle:

• Pelvic girdle is formed by joining two innominate bones.
• The outer surface possesses a depression called the acetabulum.
• The head of the femur articulates with the acetabulum.

Femur:

• Femur is the longest bone. Also known as the thigh bone.
• Its head articulates with the acetabulum of the pelvic girdle.

Summary:
As the humerus is the bone of the upper arm and the glenoid cavity is the part of the pectoral girdle/ shoulder girdle so the correct answer is option b. The Head of the humerus bone articulates with the glenoid cavity of the pectoral girdle and there is no direct connection between the humerus and pelvic girdle.

Final answer: Head of the humerus bone articulates with the glenoid cavity of the pectoral girdle