A synchondrosis (or primary cartilaginous joint) is a type of
cartilaginous joint where
hyaline cartilage
Hyaline cartilage is the glass-like (hyaline) and translucent cartilage found on many joint surfaces. It is also most commonly found in the ribs, nose, larynx, and trachea. Hyaline cartilage is pearl-gray in color, with a firm consistency and has ...
completely joins together two bones.
Synchondroses are different than
symphyses
A symphysis (, pl. symphyses) is a fibrocartilaginous fusion between two bones. It is a type of cartilaginous joint, specifically a secondary cartilaginous joint.
# A symphysis is an amphiarthrosis, a slightly movable joint.
# A growing together ...
(secondary cartilaginous joints) which are formed of
fibrocartilage
Fibrocartilage consists of a mixture of white fibrous tissue and cartilaginous tissue in various proportions. It owes its inflexibility and toughness to the former of these constituents, and its elasticity to the latter. It is the only type of ...
. Synchondroses are immovable joints and are thus referred to as
synarthroses.
Examples in the human body
Permanent synchondroses
* first
sternocostal joint (where first rib meets the manubrium of the sternum)
*petro-occipital synchondrosis
Temporary synchondroses (fuse during development)
*
epiphyseal plates
The epiphyseal plate (or epiphysial plate, physis, or growth plate) is a hyaline cartilage plate in the metaphysis at each end of a long bone. It is the part of a long bone where new bone growth takes place; that is, the whole bone is alive, with ...
* apophyses
* synchondroses in the developing
hip bone composed of the
ilium
Ilium or Ileum may refer to:
Places and jurisdictions
* Ilion (Asia Minor), former name of Troy
* Ilium (Epirus), an ancient city in Epirus, Greece
* Ilium, ancient name of Cestria (Epirus), an ancient city in Epirus, Greece
* Ilium Building, a ...
,
and
pubis
* spheno-occipital synchondrosis
References
{{Authority control
Joints