Arthrology
Dr. Archana Rani
Associate Professor
Department of Anatomy,
KGMU UP, Lucknow
16.9.2014
Introduction
• Arthrology: Study of joints
• Synonyms: Articulation (Latin)
Arthron (Greek)
• Joint: a junction between two or more bones
or cartilages.
• A device to permit movements
Classification of joints
Joints are classified according to structure and function(A) Functional (based on degree of mobility):
1.Synarthroses: immovable joints (cranial sutures in
adults, primary cartilaginous joints in
growing children).
2.Amphiarthroses: slightly movable joints (joints
between adjacent laminae of vertebrae).
3.Diarthroses: freely movable joints (synovial joints).
Functional classification (cont….)
Synarthroses
Amphiarthroses
Diarthroses
(B) Structural classification
Based on type of connecting tissue and presence or absence of
joint cavity:
1. Fibrous: composed of intervening fibrous tissue with no joint
cavity. Immovable or slightly movable.
2. Cartilaginous: articulating bones are united by cartilage
(hyaline or fibrocartilage) with no joint cavity.
3. Synovial: articulating bones are separated by a fluid-filled joint
cavity.
Structural classification (cont….)
Fibrous
Cartilaginous
Synovial
Fibrous joints
1. Sutures: articular surfaces are connected by a thin layer of
connective tissue. They are confined to the skull and
are immovable.
2. Syndesmoses: bones are connected by a considerably greater
amount of connective tissue than in sutures in
the form of interosseous ligaments and
membranes. Slight movement is permitted.
e.g. interosseous tibiofibular joints,
interroseous radioulnar joints.
3. Gomphoses (peg and socket joint): articulation of teeth in
alveolar sockets of mandible and maxilla by
periodontal ligament.
Fibrous joints (cont….)
Sutures
Syndesmoses
Gomphoses
Sutures
•
•
•
•
•
Plane
Serrate
Denticulate
Squamous
Schindylesis
Cartilaginous joints
1.Primary (Synchondroses)
2.Secondary (Symphyses)
Synovial joints
• Most evolved and freely movable joints
• Have a joint cavity filled with synovial fluid
• Often termed as diarthrodial joints
• Components:
1. Fibrous capsule
2. Synovial membrane
3. Ligaments
4. Articular cartilage
5. Articular disc or meniscus
6. Bursae
7. Fat pads (Haversian glands)
Classification of Synovial joints
(A) According to shape of articular surfaces:
1. Plane
2. Hinge
3. Pivot
4. Condylar
5. Ellipsoid
6. Saddle
7. Ball and socket
Plane joints
• Articular surfaces are
nearly flat.
• Allow
gliding
movements.
• e.g. intercarpal and
intertarsal joints.
Hinge joints (Ginglymus)
• Articular surfaces are
pulley shaped.
• Movements
are
permitted only in one
plane
(transverse
axis).
• Most
common
joints.
• e.g. elbow, knee, ankle
and interphalangeal
joints.
Pivot joints (Trochoid joints)
• Rounded end of one bone
fits
into
the concavity of another
bone.
• The
rounded
part is surrounded by a
ligament.
• Limited
rotation
around a central axis.
• e.g. superior radio-ulnar
and median atlanto-axial
joints.
Condylar joints
• Round articular surface
of one bone fits into a
socket-type
articular
surface of another bone.
• Permit movements in
two directions.
• e.g. knee and temporomandibular joints.
Ellipsoid joints
• Elliptical convex surface of
one bone articulates with
elliptical concave surface
of another.
• Permit movements in two
directions.
• Combination of
movements cause
circumduction.
• e.g. wrist and atlantooccipital joints.
Saddle (sellar) joints
• Articular surfaces are
reciprocally
saddle
shaped
i.e.
concavoconvex.
• Allows
a
wide range of movement.
• e.g.
first
carpo-metacarpal, sternoclavicular,
incudo-malleolar joints.
Ball and socket (spheroidal) joints
• Rounded convex surface
of one bone fits into the
cup-like socket of another
bone.
• Permits greatest range
of movements.
• e.g. shoulder, hip and
incudo-stapedial joints.
(B) According to plane of movements
• Uniaxial: Hinge and Pivot
• Biaxial: Condylar, ellipsoid, saddle
• Multiaxial: Ball and socket
Uniaxial
Biaxial
Multiaxial
(C) According to number of articulating bones
• Simple (2 bones)
• Compound (more than 2 bones)
Movements of synovial joints
1. Gliding (slipping)
2. Angular: flexion, extension, abduction, adduction
3. Rotary (circular): rotation (supination, pronation),
circumduction
Special movements:
1. Inversion: movement of the foot medially
2. Eversion: movement of the foot laterally
3. Protraction: movement of the mandible forward
4. Retraction: movement of the protracted part back
to its starting position
5. Elevation: lifting a body part superiorly
6. Depression: moving the elevated part inferiorly
7. Opposition: touching the thumb to the tips of
other fingers
REFERENCES
1. Cunningham’s Manual of Practical Anatomy, Vol.1.
2. Grant’s Method of Anatomy, 11th Edition.
3. Vishram Singh. General Anatomy, 1st Edition.
MCQs
1. All of the following are examples of the
fibrous joint except:
a) Suture
b) Syndesmosis
c) Symphysis
d) Gomphosis
MCQs
2. All of the following are examples of the
synovial joint except:
a) Pivot
b) Saddle
c) Syndesmosis
d)Ellipsoid
MCQs
3. Subtype gomphosis is classified under:
a) Biaxial synovial joint
b) Symphysis
c) Fibrous joint
d) Synchondrosis
MCQs
4. All of the following are characteristic features
of a synovial joint except:
a)Articular surfaces are covered by a articular
cartilage
b) Have a joint cavity filled with synovial fluid
c)Mostly are freely movable joints
d) Articular cartilage are covered by synovial
membrane
MCQs
5. All of the following secondary cartilaginous
joints belong to axial skeleton except:
a)Manubriosternal joint
b) Intervertebral discs
c) Symphysis pubis
d) Symphysis menti