Question

1. Hyaline Cartilage:

1. Is the most abundant type of Cartilage.
2. Is Vascular.
3. In the adult, is found at the ventral ends of ribs.
4. All of the above are true.
5. Only a + c are true.

2. Elastic Cartilage is found :

1. In the lips.
2. In the Pinna of the external ear.
3. In the toes.
4. Only b + c are true.

3. Fibro - Cartilage:

1. Has a wide distribution in the human body.
2. Is found in the Symphysis Pubis.
3. Is found in the Intervertebral discs .
4. All of the above are true.
5. Only b + c are true.

Answer 1

1. Hyaline cartilage is the cartilage present at articular surface of joints, in respiratory tract (nasal septum, bronchi, larynx and tracheal rings) and at ventral end of ribs (vertebrae). It is the most abundant cartilage and is composed of type II collagen. It also has chrondromucoprotein and has chondrocytes. Chondrocytes have small nuclei and also some lipid droplets. The name hyaline is obtained from its glassy appearance. However, as with other cartilage, hyaline cartilage lacks blood vessels and nerve fibers. Thus, it is an avascular tissue.

Right choice: e. only a+c are true.

2. Elastic cartilage is a cartilage composed of elastin fibers that allows moderate elasticity. It is located in the larynx, the pinna in outer ear and also in Eustachian tube of ear. It can change shape when subjected to tension, compression or when the tissue bends. It provides a flexible structure as it is stretchable.

Lips have epidermis, connective tissue (lamina propria) and muscle layer. It lacks the cartilage. The toes have articular or hyaline cartilage around the joints of the bones.

Right choice: b. In the pinna of external ear.

3. Fibrocartilage is the third type of cartilage composed of type 1 collage, and located in restricted areas of body. It is present in pubic symphysis joining the two pelvic bones. It is also found in the intervertebral disc (annulus fibrosus) of spinal cord, tendons, ligament, temporomandibular joint and menisci. This cartilage is responsible for the widening of birth canal during parturition. In intervertebral disc, the cartilage acts as a shock absorber.

It is hyaline cartilage that has widespread distribution in the body.

Right choice: e. Only b+c are true.