ANAT 1010 Lecture Notes - Humerus, Ankle, Periodontal Fiber

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JOINTS (Chapter 9)
A. Introduction
1. A joint or articulation is a point of contact between neighboring bones, between
cartilage and bones, or between teeth and bones.
B. Classification of Joints
1. Based on the presence or absence of a joint (synovial) cavity and the type of
connective tissue that binds the bones together, the structural classification of
joints categorizes joints into three major families:
i. fibrous joints
ii. cartilaginous joints
iii. synovial joints
C. Fibrous Joints
1. Fibrous joints lack a synovial cavity, and the articulating bones are held very
closely together by fibrous connective tissue; they permit little or no
movement
2. There are three types of fibrous joints:
i. Sutures
- consist of a thin layer of dense fibrous connective tissue that
strongly connects the bones i.e., skull
ii. Syndesmosis
- contains more fibrous connective tissue than in a suture i.e.,
the interosseous membrane that joins the tibia and fibula and
the radius and ulnar bones
iii. Gomphosis
- Root of tooth in its socket, connected by periodontal ligament
to bone of the mandible or maxilla
D. Cartilaginous Joints
1. Cartilaginous joints lack a synovial cavity, and the articulating bones are
tightly connected by cartilage; they permit little or no movement
2. There are two types of cartilaginous joints:
a. Synchondrosis-hylaine cartilage located at the epiphyseal plate of long
bones
b. Symphysis-fibrocartilage located at the pubic symphysis and
intravertebral disc
E. Synovial Joints
1. Synovial joints are highly movable and characterized by the presence of a
synovial membrane and a (joint) cavity that is filled with lubricating synovial
fluid.
2. Additional important characteristics include:
a) articular cartilage
b) joint cavity-filled with synovial fluid
c) articular capsule-consists of outer fibrous capsule that may have
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Document Summary

A joint or articulation is a point of contact between neighboring bones, between cartilage and bones, or between teeth and bones. Fibrous joints lack a synovial cavity, and the articulating bones are held very closely together by fibrous connective tissue; they permit little or no movement 2. There are three types of fibrous joints: i. sutures - consist of a thin layer of dense fibrous connective tissue that strongly connects the bones i. e. , skull ii. Syndesmosis - contains more fibrous connective tissue than in a suture i. e. , the interosseous membrane that joins the tibia and fibula and the radius and ulnar bones iii. Gomphosis - root of tooth in its socket, connected by periodontal ligament to bone of the mandible or maxilla d. cartilaginous joints 1. Cartilaginous joints lack a synovial cavity, and the articulating bones are tightly connected by cartilage; they permit little or no movement 2.

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