Which one of the following pairs of structures is correctly matched with their correct description?

Structure

Description

Tibia and fibula

Both form parts of knee joint

Structure

Description

Cartilage and cornea

No blood supply but do require oxygen for respiratory

Structure

Description

Shoulder joint and elbow joint

Ball and socket type of joint

Structure

Description

Premolars and molars

20 in all and 3 rooted

Answer

Structure	Description
Cartilage and cornea	No blood supply but do require oxygen for respiratory

Cartilage is usually described as a vascular, as the blood vessels innervate only the outer fibrous sheath of cartilage, called perichondrium. The cornea is the transparent anterior portion of the outer coat of the vertebrate eye covering the iris and the pupil. It is avascular as it lacks lymphatic and blood vessels.