Anatomy CH 11: Joints of the Skull

Movements of the mandible at the temporomandibular joint include:

1) Hinge movements - depression and elevation 2) Planar movements - protraction, retraction, and lateral movement

Bony surfaces of TMJ (2)

1) Mandibular fossa of the temporal bone 2) Head (condyloid process) of the mandible

Bony surfaces of sutures (4)

1) Sagittal suture 2) Frontal (coronal) suture 3) Lambdoid suture 4) Squamous suture

The anterior fontanelle is useful to the physician in determining the following: (3)

1) The position of the fetal head in utero 2) The development of the skull 3) The extent of pathological intracranial pressure

The _____________ fontanelle is the largest of the fontanelles located at the junction of the coronal and sagittal sutures. In adults, this lies at the location of the ______________

Anterior fontanelle; bregma

______________ fontanelles (sphenoid fontanelles) are small irregular fontanelles located at the junction of the frontal, parietal, sphenoid, and temporal bones

Anterolateral fontanelles

Hinge movements: __________ is inferior movement of the mandible (open the mouth)

Depression

Hinge movements: ___________ is superior movement of the mandible (close the mouth)

Elevation

Classification of Sutures

Fibrous joints, suture in type

The __________ suture is the articulation of the parietal bones with the occipital bone

Lambdoid suture

Planar movements: ______________ is side-to-side movement (grinding)

Lateral movement

______________ fontanelles (mastoid fontanelles) are small irregular fontanelles located at the junction of the occipital, parietal, and temporal bones

Posterolateral fontanelles

Planar movements: ____________ is anterior movement of the mandible in a horizontal plane

Protraction

Planar movements: ____________ is posterior movement of the mandible in a horizontal plane

Retraction

The _____________ suture is the articulation of the two parietal bones in the median plane of the skull

Sagittal suture

The ______________ suture is the articulation of the parietal bones and the temporal bones

Squamous suture

Classification of Temporomandibular Joint (TMJ)

Synovial joint, combined hinge and plane in type

From French, fontanelle =

a little fountain

Unlike the other fontanelles, which ossifiy within a few months, the ______________ becomes bony at 2 years of age

anterior fontanelle

The circumference of the articular disc attaches to the ___________________

articular capsule

There is one prominent intraarticular ligament of the TMJ called the ______________

articular disc

The bones of the _________ skull are not completely ossified at birth

fetal

The articular disc is an oval plate of fibrous tissue that sometimes contains patches of __________

fibrocartilage

Six major unossified, membranous areas between the cranial bones are called ____________

fontanelles

The ___________ suture is the articulation of the parietal bones with the frontal bone

frontal (coronal) suture

There are no ___________ or movements at the suture joints

ligaments

The inferior compartment of the articular disc is located between the articular disc and the ______________

mandible

The superior compartment of the articular disc is located between the articular disc and the __________

mandibular fossa

The triangular ____________ fontanelle is located at the junction of the lambdoid and sagittal sutures. In adults this lies at the location of the ___________

posterior fontanelle; lambda

In babies, the anterior fontanelle is called the ____________

soft spot

The articular disc divides the joint cavity into ________ separate compartments

two