On which bone do we find the mastoid process?
Occipital.
Sphenoid.
Frontal.
Temporal.
The Correct Answer is D
The mastoid process is a bony projection of the temporal bone at the posterior base of the skull.
It allows the attachment of muscles such as the sternocleidomastoid and splenius capitis.
It also contains air-filled spaces called the mastoid air cells.
Choice A is incorrect because the occipital bone forms the back and base of the skull and does not have a mastoid process.
Choice B is incorrect because the sphenoid bone is a butterfly-shaped bone at the base of the skull that does not have a mastoid process.
Choice C is incorrect because the frontal bone forms the forehead and the upper part of the eye sockets and does not have a mastoid process.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Osteoclasts are the type of cells that increase their activity in response to parathyroid hormone (PTH) and break down bone tissue to release calcium into the blood.
PTH helps maintain the right balance of calcium in the body by stimulating osteoclasts.
Choice A is incorrect because osteoblasts are the type of cells that form new bone tissue by depositing calcium into the bone matrix.
PTH inhibits osteoblasts and reduces bone formation.
Choice B is incorrect because canaliculi are not cells, but small channels within the bone matrix that allow osteocytes to communicate with each other and exchange nutrients and waste.
PTH does not affect canaliculi directly.
Choice D is incorrect because osteocytes are the type of cells that are mature bone cells trapped within the bone matrix.
PTH can stimulate osteocytes to release calcium from the bone, but not as much as osteoclasts.
Correct Answer is ["thoracic costal facet"]
Explanation
The thoracic costal facet is a feature found on the thoracic vertebrae, which are the bones that make up the mid-back region of the spine.
The costal facet is a small, flat surface located on the transverse process of the thoracic vertebrae, where it articulates with the head of the rib.
There are two costal facets on each thoracic vertebra, one on the transverse process and one on the body of the vertebra.
The costal facet is an important anatomical feature as it provides stability and support to the rib cage and facilitates the movements of the thoracic spine during respiration and other activities.
Injuries to the costal facet can result in rib fractures or dislocations, which can be very painful and require medical intervention.
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