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PIMA BIO130

CHP8 Skeletal; Special Features of the Skull

QuestionAnswer
Sutures Immovable joints between skull bones
Squamous suture Line of articulation along the top curved edge of the temporal bone
Coronal suture Joint between the parietal bones and frontal bone
Lambdoid suture Joint between the parietal bones and occipital bone
Sagittal suture Joint between the right and left parietal bones
Fontanels "Soft spots" where ossification is incomplete at birth; allow some compression of the skull during birth; also important in determining the position of the head before delivery; six such areas located at angles of the parietal bones
Anterior (or frontal) fontanel At the intersection of the sagittal and coronal sutures (juncture of the parietal bones and frontal bone); diamond shaped; largest of the fontanels; usually closed by 11.2 years of age
Posterior (or occipital) fontanel At the intersection of the sagittal and lambdoid sutures (juncture of the parietal bones and occipital bone); triangular; usually closed by the second month
Sphenoid (or anterolateral) fontanel At the juncture of the frontal, parietal, temporal, and sphenoid bones
Mastoid (or posterolateral) fontanel At the juncture of the parietal, occipital, and temporal bones; usually closed by the second year
Air sinuses Spaces. or cavities, w/in bones; those that communicate with the nose are called paranasal sinuses (frontal, sphenoidal, ethmoidal, and maxillary); mastoid cells communicate with the middle ear rather than the nose, not included among the paranasal sinus
Frontal bone forms what part of orbit Roof of the orbit
Ethmoid bone forms what part of orbit Medial wall
Lacrimal bone forms what part of orbit Medial wall
Sphenoid bone forms what part of orbit Lateral wall
Zygomatic bone forms what part of orbit Lateral wall
Maxilla forms what part of orbit Floor
Palatine bone forms what part of orbit Floor
Nasal septum formed by Partition in the midline of nasal cavity; separates the cavity into right and left halves
Perpendicular plate of the ethmoid bone forms what part of nasal septum Forms the upper part of the septum
Vomer forms what part of nasal septum Forms the lower, posterior part of the septum
Cartilage forms what part of nasal septum Forms the anterior part of the septum
Sutural (wormian) bones Small islets of bone in sutures; vary greatly from person to person
Malleus, incus, stapes Tiny bones, referred to as auditory ossicles, in the middle ear cavity in the temporal bones; resemble, respectively, a mini hammer, anvil, and stirrup
Created by: Jgiron6994