33 terms

Skull and Facial Bones

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The skull consists of __ bones
22
Frontal bone
forms the forehead (the anterior part of the cranium), the roofs of the orbits, and most of the anterior part of the cranial floor
Frontal sinuses
mucous membrane-lined cavities that lie deep within the frontal bone
Parietal bones
form most of the sides and roof of the cranial cavity
Temporal bones
form the inferior (lower) sides of the cranium and part of the cranial floor
Zygomatic arch
where the temporal and zygomatic bones join
External auditory meatus
the canal in the temporal bone that leads to the middle ear
Mastoid process
a rounded projection of the temporal bone posterior to (behind) the external auditory meatus
Styloid process
a slender projection that points downward from the undersurface of the temporal bone and serves as a point of attachment for muscles and ligaments and neck
Carotid foramen
a hole through which the carotid artery passes
Occipital bone
forms the posterior part and most of the base of the cranium
Foramen magnum
the largest foramen in the skull, passes through the occipital bone
Occipital condyles
oval processes, one on either side of the foramen magnum that articulate (connect) with the first cervical vertebr
Sphenoid bone
lies at middle part of the base of the skull. Called the keystone of the cranial floor
Sphenoidal sinuses
the cubelike central portion of the sphenoid bone; drain into the nasal cavity
Hypophyseal fossa
a depression on the superior surface of the sphenoid which contains the pituitary gland
Ethmoid bone
spongelike in appearance and is located in the anterior part of the cranial floor between the orbits
Nasal bones
form part of the bridge of the nose
Maxillae
unite to form the upper jawbone and articulate with every bone of the face except the mandible (lower jawbone)
Palatine bones
fused and form the posterior portion of the hard palate , part of the floor and lateral wall of the nasal cavity, and a small portion of the floors of the orbits
Mandible
lower jawbone; the largest, strongest facial bone
Zygomatic bones
commonly called cheekbones, form the prominences of the cheeks and part of the lateral wall and floor of each orbit
Lacrimal bones
the smallest bones of the face; thin and roughly resemble a fingernail in size and shape
Inferior nasal conchae
scroll-like bones that project into the nasal cavity below the superior and middle nasal conchae of the ethmoid bone
Vomer
roughly triangular bone on the floor of the nasal cavity that articulates inferiorly with both the maxillae and palatine bones along the midline of the skull
Suture
an immovable joint in an adult that is found only between skull bones; hold skull bones together
Coronal suture
unites the frontal bone and 2 parietal bones
Sagittal suture
unites the 2 parietal bones
Lambdoid suture
unites the parietal bones to the occipital bone
Squamous sutures
unite the parietal bones to the temporal bones
Paranasal sinuses
located in certain skull bones near the nasal cavity
Fontanels
mesenchyme-filled spaces; found between cranial bones at birth
Hyoid bone
a unique component of the axial skeleton because it does not articulate with or attach to any other bone