Figure 10.9 The fetal skull. (a) Lateral view; (b) superior view. Anterior Fontanel Coronal Suture Frontal Bone Mastoid (Posterolateral) Fontanel Occipital Bone Parietal Bone Posterior Fontanel Sagittal Suture Squamous Suture Sphenoid Bone Sphenoid (Anterolateral) Fontanel Temporal Bone The Fetal Skull The incompletely ossified fetal skull is shown in Figure 10.9. The unossified sutures and fontanels, membranous areas at the junction of several cranial ones, allow the compression of the skull during mildbirth and growth of the brain after birth. There are six fontanels. The large anterior fon- mel lies on the midline at the junction of the frontal temporal bones. A mastoid (posterolateral) fonta- el is on each side of the skull at the junction of the temporal, parietal, and occipital bones. Assignment 1. Label Figure 10.9 and complete Section A of
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The Skull Spotlight Figure 7.4: Sectional Anatomy of the Skull Part A - Cranial and Facial Bones, Structures, and Foramina The 22 bones of the skull are organized into the 8 cranial bones and 14 facial bones. The skull serves multiple critical functions, such as cradling the delicate brain tissue and housing the major sensory organs. The foramina (holes) in the skull serve as passageways for nerves and blood vessels. Determine which of the following are a cranial or facial bone or a structure/foramina of one of these types. View Available Hint(s) Carotid canal Nasal bone Styloid process Hypophyseal fossa Frontal bone Jugular foramen Mandible Palatine bone Cranial Facial
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The Skull. First, match the bone names in column B with the descriptions in column A (the items in column B may be used more than once). Then, circle the bones in column B that are cranial bones. Column A 1. forms the anterior cranium 2. cheekbone 3. bridge of nose 4. posterior bones of the hard palate 5. much of the lateral and superior cranium 6. single, irregular, bat-shaped bone forming part of the cranial base 7. tiny bones bearing tear ducts 8. anterior part of hard palate 9. superior and middle nasal conchae form from its projections 10. site of mastoid process 11. has condyles that articulate with the atlas 12. small U-shaped bone in neck, where many tongue muscles attach 13. organ of hearing found here 14. two bones that form the nasal septum 15. forms the most inferior turbinate Column B a. ethmoid b. frontal c. hyoid d. inferior nasal conchae e. lacrimal f. mandible g. maxilla h. nasal i. occipital j. palatine k. parietal l. sphenoid m. temporal n. vomer o. zygomatic
The skull consists of two major regions. Describe these in this Checkpoint. Located in one pair of the cranial bones (the temporals are the tiny bones of the middle ear. Each middle ear contains (23?6?8? bones. The remaining bones of the skull are comprised of bones that provide a structural framework for the face. The total number of bones in the cranium, middle ears, and face is bones. Answer these questions on the cranium. a. What is the primary function of the cranium? List several other functions of the cranium.
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