![]() ![]() The cavities also act as resonance chambers that enhance vocal (and singing) quality.įigure 1.The right lateral view and anterior view of the skull's bonesįigure 2. The cavities secrete mucus that drains into the nasal cavity. Sinuses (paranasal sinuses) are mucus‐lined cavities inside cranial and facial bones that surround the nasal cavity.Air entering the cavity is warmed and cleansed by mucus lining the cavity. The nasal cavity is formed by cartilage and several bones.These fossae, called the anterior, middle, and posterior cranial fossae, provide spaces that accommodate the shape of the brain. Cranial fossae are three depressions in the floor of the cranium.The cranial floor (base) denotes the bottom of the cranium. The cranial vault denotes the top, sides, front, and back of the cranium.Sutural (Wormian) bones are very small bones that develop within sutures. ![]() Bone growth eventually fills the spaces by age two. The spaces provide pliability for the skull when it passes through the birth canal and for brain growth during infancy. Fontanels are spaces between cranial bones that are filled with fibrous membranes.Sutures are immovable interlocking joints that join skull bones together.The bones also provide attachment for muscles that move the head and control facial expressions and chewing.įigures 1 and 2 illustrate specific characteristics of these bones, while some general features of the skull follow: The bones of the skull provide protection for the brain and the organs of vision, taste, hearing, equilibrium, and smell. The bones are listed in Table , but note that only six types of cranial bones and eight types of facial bones are listed because some of the bones (as indicated in the table) exist as pairs. The skull consists of 8 cranial bones and 14 facial bones. Quiz: Regulation of Urine Concentration.Quiz: Structure of the Digestive Tract Wall.Quiz: Function of the Respiratory System.Quiz: Structure of the Respiratory System.Quiz: Supplements to the Immune Response.Quiz: Humoral and Cell-Mediated Immune Responses.Humoral and Cell-Mediated Immune Responses.Quiz: Specific Defense (The Immune System).The Immune System and Other Body Defenses.Quiz: Functions of the Cardiovascular System.Quiz: The Hypothalamus and Pituitary Glands The human cranium, which houses and protects the brain, is composed of six major bones: the ethmoid, frontal, occipital, parietal, sphenoid and temporal.Quiz: The Ventricles and Cerebrospinal Fluid.Quiz: Muscle Size and Arrangement of Muscle Fascicles.Muscle Size and Arrangement of Muscle Fascicles. ![]()
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