Several features of the skull can be seen when it is sectioned in the midsagittal plane. Locate the major bones of the skull and the features seen in this section. The nasal septum consists of two bony structures, the perpendicular plate of the ethmoid bone and the vomer. The crista galli extends superiorly from the cribriform plate of the ethmoid bone. The junction of the maxilla and the palatine bone that make up the hard palate can be seen from this view as well. The frontal sinus and the sphenoid sinus are two cavities seen here. Label the bones and the major features of the midsagittal section of the skull using the terms provided. Color the bones different colors and shade the sinuses in a darker shade of the color used for the specific bones that hold the sinuses.
Sphenoid bone Ethmoid bone
Sella turcica Cribriform plate of the ethmoid
Palatine bone Perpendicular plate of the ethmoid
Crista galli Frontal sinus
Answer Key: a. Frontal bone, b. Frontal sinus, c. Nasal bone, d. Ethmoid bone, e. Crista galli, f. Cribriform plate of the ethmoid, g. Perpendicular plate of the ethmoid, h. Vomer, i. Maxilla, j. Palatine bone, k. Mandible, I. Parietal bone, m. Temporal bone, n. Sella turcica, o. Occipital bone, p. Internal acoustic meatus, q. Sphenoid bone, r. Sphenoid sinus
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.