Types of Cartilage

3 Main Types of Cartilage

1) Articular cartilage

>> Seen in -
● arytenoid cartilage
● most synovial joints
● cricoid,costal
● throid ,tracheobronchial
● nasal septum and lateral wall
● ephiphyseal plate

>> has no nerves,no vessels,no perichondrium,no ossification

>> provides smooth articular surface

>> degenerated surface cells are replaced by underlying growing cells

2) Elastic cartilage :

>> present in structures reveiving or producing sounds

>> seen in
● auricle and acoustic meatus
● corniculate and cuneiform laryngeal cartilage
● epiglottis

3) Fibroelastic cartilage :

>> seen in
● intervertebral disc
● symphysis
● glenoid labrum and acetabular labrum

Read more

Parts of Bone

4 Parts of Bone

1) Epiphysis : End or tip of bone derived feom 2°ossification centre.4 types of epiphysis
Pressure epiphysis :

• Transmits weight and are articular
• E.g. femoral head,upper end of tibia,lower end of radius

Traction epiphysis :

• Provides attacment to tendons
• E.g. Mastoid process,tubercles of humerus,trochanters of femur

Atavistic epiphysis :

• Phylogenitically independent bone which has attched to other bone in human
• E.g. coracoid process of scapula,os trigonum,posterior tubercle of talus

Aberrant epiphysis :

• Not always present
• E.g. head of 1st metacarpal and base of other metacarpals

2) Diaphysis :

• Strogest part of bone
• Ossify from 1° centre

3) Epiphyseal growth plate :

• Zone of maximal growtg
• Between epiphysis and metaphysis

4) Metaphysis :

• Has hair pin arrangement of vessels
• Zone of infection
• More prone to injury

Read more