Joints & Movement

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43 Terms

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Joints
Functional junctions between bones that are formed wherever two or more bones meet
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Synarthrotic
Immovable
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Amphiarthrotic
Slightly movable
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Diarthrotic
Freely movable
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Fibrous Joints
*  Dense connective tissue connect bones
*  Between bones in close contact
*  Not much movement
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Kinds of Fibrous Joints
Syndesmosis, suture, gomphosis
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Syndesmosis
* Joint bound by ligaments
*  Permits a slight movement
*  Amphiarthrotic joint
*  ex. Distal end of tibia and fibula
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Sutures
*  Between flat bones of skull
* ex. squamous, coronal, sagittal, and lambdoidal.
* As adult, sutures close and interlock


* synarthrotic joint (immovable)


*  Fontanels - membranous areas in baby skull - allows skull to change shape during childbirth.
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Gomphosis
* Cone shaped bone in a bony socket
* ex. root of tooth in jawbone
* Ligament wraps around root to hold it in
* synarthrotic joint (immovable)
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Kinds of Cartilaginous Joints
*  Synchondrosis - usually disappears
*  Symphysis - holds two bones together with cartilage
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Synchondrosis
*  Bands of hyaline cartilage unit bonds
*  Disappear as we grow
*  ex. epiphyseal disk
*  synarthrotic joint (immovable)
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Symphysis
*  Bones covered by a thin layer of hyaline cartilage with fibrocartilage in between
*  ex. symphysis pubis and intervertebral discs
*  *amphiarthrotic joints (semi-movable)* 
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Synovial Joints
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*  Most joints are of this type
*  Freely movable joints
*  Have articular cartilage, joint capsule, and synovial membrane
*  diarthrotic (movable)
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Ball and Socket
Movement in all planes
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Condyloid
Ellipsoidal

No rotational movement

Metacarpals and phalanges
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Gliding
Flat or slightly curved

Sliding motion

Between carpal and tarsal bones
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Hinge
Concave surface fits into a convex surface

One plane movement

Knee, elbow, and phalanges
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Pivot
One bone rotates around another

Rotational movement

Proximal end of radius and ulna, atlas and dens
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Saddle
Have convex and concave surfaces

Variety of movements

Between carpal and metacarpal
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Articular Cartilage
*  Covers ends of bones
*  Made up of hyaline cartilage
*  Reduces friction and resists wear
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Joint Capsule
Outer layer - fibrous connective tissue

Inner layer - synovial membrane
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Outer Layer - Fibrous connective tissue
Connects to periosteum

Totally encloses the joint
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Inner Layer - Synovial membrane
Shiny, vascular tissue

Secretes synovial tissue - lubricates joint and cuts down on friction
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Menisci
* 1/2 moon shaped fibrocartilage
* found in some joints
* cushions the joint
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Bursae
* fluid-filled sacs in joint
* found in some joints
* contain synovial fluid
* cushion and helps the movement of tendons
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Flexion
* Decreasing an angle between two bones.


1. Bending the arm at the elbow toward the shoulder.
2. Bending your finger.
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Extension
* Increasing the angle between two bones.


1. Straightening a bone.
2. Ex. Straightening the arm or leg.
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Hyperextension
* Extension of a bone beyond normal anatomical position.


1. Bending the head backwards as if looking up to the sky.
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Dorsiflexion
* Flexing the foot at the ankle.


1. Bending the toes up to the shin.
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Plantar Flexion
* Extending the foot at the ankle.


1. Pointing the toes.
2. This is actually a type of extension not flexion.
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Abduction
* Moving a part away from the midline of the body.


1. Lifting leg out to side.
2. Ex. Lifting arms lateral to shoulder.
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Adduction
* Moving a part toward the midline of the body.


1. Bringing arm back down to side.
2. Bringing leg back down to standing.
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Rotation
* Moving a part around an axis.


1. Turning the head from side to side.
2. Turning the palm of hand up and down.
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Circumduction
* 1. Moving a part so that its end follows a circular path.


1. Ex. Moving finger in a circle without moving the hand.
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Supination
* Turning the palm of the hand upward.
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Pronation
* Turning the palm of the hand downward.
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Eversion
* Turning the sole of the foot outward or laterally.
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Inversion
* Turning the sole of the foot inward.
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Protraction
* Moving a part forward.


1. Jutting the jaw forward.
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Retraction
* Moving a part backward.


1. Pulling the jaw back in.
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Elevation
* Raising a part.


1. Shrugging of the shoulders.
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Depression
* Lowering a part.


1. Drooping the shoulders.
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Opposition
* Movement of the thumb to the finger for the purposes of grasping.