Download MBBS (Bachelor of Medicine, Bachelor of Surgery) Human Anatomy ppt lectures Topic 14 Joints Notes. - anatomy ppt free download human anatomy ppt lectures, medicine notes ppt, anatomy handwritten notes pdf, mbbs 1st year anatomy notes pdf download, best anatomy notes pdf, human anatomy notes pdf, anatomy easy notes pdf, anatomy notes online, anatomy short notes, Anatomy ppt, Powerpoint Presentations and lecture notes.
Cartilage
In Developing Embryo
More prevalent than in adult
Skeleton initially mostly
cartilage
Bone replaces cartilage in fetal
and childhood periods.
Cartilage is
connective
tissue.
Types of cartilage
1.
Hyaline cartilage
2.
Elastic cartilage
3.
Fibrocartilage
Bones
?Support
?Movement: muscles attach by tendons and
use bones as levers to move body
?Protection
?Mineral storage
?Blood cell formation and energy storage
?Bone marrow: red makes blood, yellow stores fat
Classification of bones by shape
?Long bones
?Short bones
?Flat bones
?Irregular bones
?Pneumatic bones
?Sesamoid bones
(Short bones include sesmoid bones)
%
Gross anatomy of bones
JOINTS
synonyms:
articulations,
junctions
A site where two or more bones come
together, whether or not movement
occurs between them, is called a joint.
JOINTS ARE CLASSIFIED ACCORDING TO
Range and type of movement they permit.
Immovable joints (SYNARTHROSIS)
Slightly movable joints (AMPHIARTHROSIS)
Movable joints (DIARTHROSIS)
Anatomical structure
Fibrous joints,
Cartilaginous joints,
Synovial joints.
Functions:
? Permit movement
? Growth
? Molding during childbirth
? Concerned with differential growth
? Transmission of forces
Structural Classification
a) Fibrous e.g. i) Sutures,
ii) Syndesmosis
iii) Gomphosis
b) Cartilaginous e.g. i) Primary Cartilaginous
ii) Secondary cartilaginous
c) Synovial e.g. i) Uniaxial: Hinge, Pivot
ii) Biaxial: Condylar, Ellipsoid
iii) Multiaxial: Ball & Socket, Saddle
Movements
Flexion
Extension
Adduction
Abduction
Circumduction
Rotation
SYNARTHROSES / FIBROUS JOINTS
Bones connected by fibrous tissue: dense
regular connective tissue
No joint cavity
Slightly movable or immovable
BONE-- fibrous connective tissue--BONE
SUTURES
SCHINDYLESIS
SYNDESMOSIS
GOMPHOSIS
SUTURES
bone--collagenous sutural ligament--bone
-Present only between bones of skull.
-Fibrous tissue is
continuous with
periosteum
-Sutures ossify and
fuse in middle age:
Called "synostoses"
TYPES OF SUTURES
PLANE SUTURE
?Simple apposition of contiguous surfaces,
? usually rough and
reciprocally irregular,
Examples
? sutures between the
palatine bones,
? between the maxillae and
at the palatomaxillary sutures.
Denticulate Suture
Has small tooth like projections,
often widening towards their
ends to provide effective
interlocking.
When united by sutural
ligament and periosteum, such
sutures are almost completely
immobile
The lambdoid suture is a
denticulate suture.
SERRATED SUTURE
The sagittal suture is serrated.
Squamous suture
Where bones overlap,
as at the temporo-
parietal suture, a
squamous suture is
formed; the adjacent
bone surfaces are
reciprocally bevelled.
Schindylesis
Between Ala of
Vomer and
Rostrum of Sphenoid
Syndesmoses
In Greek: "ligament"
Bones connected by
ligaments only
Amount of movement
depends on length of
the fibers: longer than
in sutures
Gomphoses
Is a "peg-in-socket"
Only example is tooth
with its socket
Ligament is a short
periodontal ligament
Cartilagenous joints
Articulating bones united by cartilage
Lack a joint cavity
Not highly movable
Two types
Synchondroses (singular:
synchondrosis)
Symphyses (singular: symphysis)
Synchondroses
Primary Cartilaginous Joints
Literally: "junction of cartilage"
A plate or bar of Hyaline cartilage unites the
bones
Immovable (synarthroses)
Examples:
Epiphyseal plates between epiphysis and
diaphysis of growing bone.
Joint between first rib's costal cartilage and
manubrium of the sternum
Synchondrosis
Symphysis
Symphyses
Secondary Cartilaginous Joints
Literally "growing together"
Fibrocartilage unites the bones
Slightly movable (amphiarthroses)
Resilient shock absorber
Provide strength and flexibility
Hyaline cartilage on articular surfaces of bones
to reduce friction
Examples
Intervertebral discs
Pubic symphysis of the pelvis
Symphysis
Intervertebral Disc
Pubic Symphysis
The lambdoid suture is an example of a(n)
A. Diarthrosis
B. Amphiarthrosis
C. Synarthrosis
D. Synarthrosis and fibrous
The lambdoid suture is an example of a(n)
A. Diarthrosis
B. Amphiarthrosis
C. Synarthrosis
D. Synarthrosis and fibrous
Which of the following is an example of a
synchondrosis?
A. First sternocostal articulation
B. Humeroscapular articulation
C. Symphysis pubis
D. Tibiofibular articulation
Which of the following is an example of a
synchondrosis?
A. First sternocostal articulation
B. Humeroscapular articulation
C. Symphysis pubis
D. Tibiofibular articulation
The procedure arthroscopy refers to:
A. Examining interior of joint
B. Reducing inflammation of a bursa
C. Re-establishing blood supply of muscles
D. Repair of bone fractures
The procedure arthroscopy refers to:
A. Examining interior of joint
B. Reducing inflammation of a bursa
C. Re-establishing blood supply of muscles
D. Repair of bone fractures
Which of the following joints are held
together by cartilage?
A. Diarthrosis
B. Gomphosis
C. Symphysis
D. Synovial
Which of the following joints are held
together by cartilage?
A. Diarthrosis
B. Gomphosis
C. Symphysis
D. Synovial
The radioulnar joint is an example of a
A. Hinge
B. Pivot
C. Planar
D. Synarthroses
The radioulnar joint is an example of a
A. Hinge
B. Pivot
C. Planar
D. Synarthroses
Synovial joints
DIARTHROSES
?Structure: bone--articular cartilage--
synovial fluid in cavity ? articular cartilage--
bone
?Bond : surrounding sleeve of collagenous
fibrous capsule lined by synovial membrane;
extrinsic and intrinsic ligaments. Occasional
intracapsular ligaments, tendons, fat pads,
fibrocartilaginous discs or menisci.
Synovial Joint
SHOULDER JOINT
ARTICULAR
CARTILAGE
*
*
*
*
*
JOINT
CAVITY
SYNOVIAL
MEMBRANE
*
ARTICULAR
CAPSULE
SYNOVIAL JOINT
KNEE JOINT
ARTICULAR
SYNOVIAL
CARTILAGE
MEMBRANE
PAD OF FAT
CAPSULE
MENISCUS
JOINT CAVITY
General Structure of Synovial Joints
1. Articular cartilage
Hyaline
Spongy cushions absorb
compression
Protects ends of bones
from being crushed
2. Joint (synovial) cavity
Potential space
Small amount of
synovial fluid
3. Articular (joint) capsule
Two layered
Outer*: fibrous capsule of
dense irregular connective
tissue continuous with
periosteum.
Inner*: synovial membrane
of loose connective tissue
(makes synovial fluid)
Lines all internal joint surfaces
except the cartilages*
4. Synovial fluid
Filtrate of blood
Contains special
glycoproteins
Nourishes cartilage and
functions as slippery
lubricant
5. Reinforcing ligaments
Capsular (most) ?
thickened parts of capsule
Extracapsular
Intracapsular
6. Nerves
Detect pain
Monitor stretch (one of the
ways of sensing posture
and body movements)
7. Blood vessels
Rich blood supply
Extensive capillary beds in
synovial membrane
(produce the blood filtrate)
Articular disc or
meniscus
(literally "crescent")
Only some joints
Those with bone
ends of different
shapes or fitting poorly
Some to allow two kinds of movement (e.g. jaw)
Fibrocartilage
Examples: knee
TMJ (Temporomandibular joint)
sternoclavicular joint
?Fatty pads are found in
some synovial joints lying
between the synovial
membrane and the
fibrous capsule or bone.
?Examples are found in
the hip and knee joints.
Bursae and tendon sheaths
Contain synovial fluid
Not joints but often associated with them
Act like ball bearings
Bursa means "purse" in Latin
Flattened sac lined by synovial membrane
Where ligaments, muscles, tendons, or bones overlie each other and rub
together
Tendon sheath
Only on tendons subjected to friction
Bursae and tendon sheaths
UNI-AXIAL
Hinge Joint , Pivot Joint, Condylar
Joint
BI-AXIAL
Condylar Joint, Ellipsoid Joint,
Saddle Joint
MULTI-AXIAL Ball and Socket
NON-AXIAL
Plane Joint
Plane joints:
?In plane joints, the apposed articular surfaces
are flat or almost flat, and this permits the
bones to slide on one another.
?Examples of these joints are the sternoclavicular
and acromioclavicular joints
Hinge joints:
?Hinge joints resemble the hinge on a door,
so that flexion and extension movements are
possible.
Examples of these joints are the elbow, knee, and
ankle joints
Pivot joints:
?In pivot joints, a central
bony pivot is
surrounded by a bony-
ligamentous ring and
rotation is the only
movement possible.
? E.g atlantoaxial and
superior radioulnar
joints
Condylar joints
?Condyloid joints have
two distinct convex
surfaces that
articulate with two concave surfaces.
?The movements of flexion, extension, with a
small amount of rotation.
?E.g. knee joint , temporo-mandibular joint
Ellipsoid joints
?In ellipsoid joints, an
elliptical convex
articular surface fits
into an elliptical
concave articular
surface. The movements of flexion, extension,
abduction, adduction and circumduction can
take place, but rotation is impossible.
?E.g. wrist joint, metacarpophalangeal joint
Saddle joints:
?The articular surfaces are
reciprocally concavoconvex
and resemble a saddle on a
horse's back.
?These joints permit flexion, extension,
abduction, adduction, and rotation.
?E.g. carpometacarpal joint of the thumb,
sternoclavicular joint
Ball and socket joints:
?In ball-and-socket joints,
a ball-shaped head of
one bone fits into a socket
like concavity of another.
?This arrangement permits free movements,
including flexion, extension, abduction,
adduction, medial rotation, lateral rotation, and
circumduction.
? E.g. shoulder and hip joints
Stability of Joints
The stability of a joint depends on three main
factors:
?the shape,
?size,
?arrangement of the articular surfaces;
?the ligaments;
?and the tone of the muscles around the joint.
MECHANISM OF LUBRICATION OF SYNOVIAL
JOINT
?Synovial fluid
?Hyaline cartilage
?Harvesian fatty pads
?Bursa
Nerve Supply of Joints
?The capsule and ligaments receive an
abundant sensory nerve supply.
?A sensory nerve supplying a joint also
supplies the muscles moving the joint and
the skin overlying the insertions of these
muscles, a fact that has been codified as
Hilton's law.
PLANE
SYNOVIAL
JOINT
PLANE SYNOVIAL JOINT
FIRST CERVICAL
VERTEBRA
PIVOT
DENS OF SECOND
CERVICAL
VERTEBRA
PIVOT
JOINT
HINGE JOINT
HINGE JOINT
ELBOW
JOINT
BIAXIAL
CONDYLAR JOINT
ELLIPSOID JOINT
MULTIAXIAL JOINT
SHOULDER
JOINT
HIP JOINT
SADDLE JOINT
BALL & SOCKET
JOINT
SADDLE JOINT
Classification of Synovial Joints
(According to the number of bones)
?SIMPLE JOINT Interphalangeal joint
?COMPOUND JOINT elbow ,wrist
?COMPLEX JOINT temporomandibular
joint
This post was last modified on 05 April 2022