Articulation System Framework

The skeletal framework of articulation system

I.Upper cervical vertebral column

II.Bones of Facial Skeleton

III.Cranial (Skull ) Bones

Cervical Vertebrae (C1-C7)

The cervical vertebra lies behind the pharynx and forms part of the posterior pharyngeal wall.

Bones of the facial skeleton that form the articulation framework

Mandible

Maxilla

Mandible

Single bone forming the lower jaw

Forms the only movable joint in the skull

It has two projections: condyloid and coronoid processes

condyloid process of mandible

Articulates with temporal bone by the temporomandibular joint

Coronoid Process of mandible

insertion of temporalis

Prognathic jaw

Class III Malocclusion (underbite)

Retrognathic jaw

Class II Malocclusion (overbite)

Pierre Robin Sequence (PRS)

An unusually small jaw, which alters tongue position and can induce problems with swallowing

Treacher Collins Syndrome

Variety of facial deformities, including lowered eyes, absent cheekbones, cleft palate

Maxilla

- Upper jaw

-Paired bone forming the nose, upper dental ridge, and most of the hard palate

-Houses upper teeth

-Forms part of orbit of eye (floor)

-Joints w/ all other facial bones except mandible

Maxilla has four processes

- Frontal: provides some framework for the nose; articulates with frontal bone

- Zygomatic: articulates with zygomatic bone

- Alveolar: holds the teeth

- Palatine: floor of the nasal cavity, roof of the mouth

temporomandibular joint (TMJ)

The joint between the temporal bone and the mandible

It is an ellipsoid-condyloid joint (ball and socket).

This joint allows you to hinge and glide (front/back, side/side).

TMJ ligaments

temporomandibular ligament

sphenomandibular ligament

stylomandibular ligament

The mandible can move in three different ways relative to the skull

- Upward and downward

- Forward and backward

- Side to side

What is articulation?

Adjustment of the shape of the vocal tract by movement of articulators

Cavities of the articulatory system

oral, buccal, nasal, pharyngeal

oral cavity

Extends from mouth to the faucial pillars

Size and shape or the oral cavity can be altered by movement of lips, tongue and mandible to make different speech sounds

buccal cavity

Vestibule of the oral cavity; the space between the lips, gums, and teeth.

Oral Cavity Structures

lips, teeth, tongue, palate, tonsils

the function of the lips during articulation

Consonants: /p, b, m, f, v, w/ need lip (labial) involvement

Most back vowels in English require labial movement

Tongue

The most mobile articulator

Consists of four parts:

Dorsum: superior surface

Tip (apex): anterior-most portion

Base: resides in the oropharynx

Root: Inferior

Tongue Portions

Oral/Palatine surface: 2/3--within the oral cavity

Pharyngeal surface: 1/3--within the pharyngeal cavity

Median fibrous septum: divides the tongue into right and left halves (central sulcus)

The Palate

Consists of the alveolar arch, hard palate, and soft palate (or velum)