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PIMA BIO130
CHP8 Skeletal; Special Features of the Skull
| Question | Answer |
|---|---|
| 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
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