Anat 1 Chapter 8 : Articulations Functional / Structural Classification of Joints 3) Diarthrosis (free movement) Special Movements 6 types of Diarthroses

Anat 1 Chapter 8 : Articulations Functional / Structural Classification of Joints 3) Diarthrosis (free movement) Special Movements 6 types of Diarthroses www.phwiki.com

Anat 1 Chapter 8 : Articulations Functional / Structural Classification of Joints 3) Diarthrosis (free movement) Special Movements 6 types of Diarthroses

Graham, Spike, On-Air Personality has reference to this Academic Journal, PHwiki organized this Journal Anat 1 Chapter 8 : Articulations Functional / Structural Classification of Joints Synarthrosis (no movement) Bony Fusion (Synostosis) Fibrous (Suture in addition to Gomphosis) Cartilaginous (Synchondrosis) Amphiarthrosis (little movement) Fibrous (Syndesmosis) Cartilaginous (Symphysis) 3) Diarthrosis (free movement) Always synovial joints mono, di-, in addition to triaxial Strength vs. motility The greater the range of motion, the weaker the joint. Dislocation = luxation Partial dislocation = “Double jointed”

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Diarthroses = Synovial Joints Have synovial cavity = space between two bones Components that are always present (fig 8-1) Components that are sometimes present 3 Types of Motion at Synovial Joints Linear motion = gliding Angular motion : flexion, extension, hyperextension ab-, adduction circumduction Rotation left – right, internal or medial, external or lateral supination, pronation Special Movements Dorsiflexion, plantar flexion Protraction, retraction Elevation, depression Eversion inversion

6 types of Diarthroses Gliding Joint Hinge Joint Pivot Joint Ellipsoidal joint Saddle joint Ball & Socket joint Gliding Joint articulating surfaces flat. also found between carpals in addition to tarsals only slight movement – rotation prevented by Hinge Joint Convex surface of bone 1 fits into concave surface of bone 2 found in monoaxial

Pivot Joint Projection of bone 1 articulates within ring of bone 2 Also found in proximal ends of ulna in addition to radius pronation in addition to supination rotation Ellipsoidal (Condyloid) Joint Oval shaped condyle of bone 1 fits into elliptical cavity of bone 2 Also found between phalanges & metacarpals/-tarsals Angular motion in two planes (= ) Saddle Joint Articular surfaces shaped like saddle in addition to rider Modified condyloid joint Extensive angular motion without rotation Also between malleus in addition to incus

Ball in addition to Socket Joint Ball like surface of bone 1 fits into cuplike depression of bone 2 Found in — Allows as long as flexion, ab- or adduction in addition to rotation ( –axial) Representative Articulations Temporom in addition to ibular Joint Mostly hinge joint, some gliding in addition to rotation Articular disc Intervertebral articulations Gliding joints between — Intervertebral discs: (Amphiarthroses) annulus fibrosus: tough outer layer (fibrocartilage) nucleus pulposus: soft, gelatinous core Account as long as ~25% of vertebral column height – H2O loss during aging Intervertebral ligaments Fig 8-8

Disc Problems Slipped disc vs. herniated disc Most common sites as long as disc problems: C5 – C6 L4 – L5 L5 – S1 Lumbago Laminectomy ( surgical removal vertebral arch by shaving laminae to access disc) Fig 8-9 Glenohumeral Joint Type Greatest range of motion (due to loose in addition to shallow) Most frequently dislocated Stability provided by Hip Joint Deep well fitted – joint Participants Stabilization: Extracapsular in addition to intracapsular ligaments (ligamentum teres = ligamentum capitis femoris) Surrounding muscles Most important normal movement Fig 8-15

Knee Joint Much more complex than elbow Much less stable than other — structurally 3 separate joints Extra- in addition to intracapsular ligaments Locking of knee due to external rotation of tibia Figs 8-16 & 17 The end

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Graham, Spike On-Air Personality

Graham, Spike is from United States and they belong to WVAS-FM and they are from  Montgomery, United States got related to this Particular Journal. and Graham, Spike deal with the subjects like Jazz

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