A&p Chapter 7 Self Quiz - The Skeletal System: The Axial Skeleton

Ribs that are not attached to the sternum are actually known as the false ribs. The false ribs are the last five pairs of ribs in the ribcage, which are not directly connected to the sternum. Instead, they are attached to the rib above them or not attached at all in the case of the last two pairs. The true ribs, on the other hand, are the first seven pairs of ribs that are directly attached to the sternum. Therefore, the statement "Ribs that are not attached to the sternum are known as the true ribs" is incorrect.

The hypophyseal fossa of the sella turcica of the sphenoid bone contains the pituitary gland. The pituitary gland, also known as the "master gland," is a small pea-sized gland located at the base of the brain. It plays a crucial role in regulating various bodily functions by producing and secreting hormones that control growth, metabolism, reproduction, and other important processes. The sella turcica is a bony depression in the sphenoid bone that houses and protects the pituitary gland.

The vomer is the only bone listed that is not paired. It is a thin, flat bone that is located in the midline of the nasal cavity, dividing it into left and right sides. The palatine, lacrimal, maxilla, and nasal bones are all paired bones that are found on both sides of the face.

The atlanto-occipital joints are responsible for the flexion and extension of the head, allowing us to nod up and down. Rotation of the head, as in signifying "no," is primarily controlled by the atlantoaxial joints. Therefore, the statement that the atlanto-occipital joints allow you to rotate the head is false.

The suture located between a parietal and temporal bone is the squamous suture. The squamous suture is a type of joint that connects the squamous part of the temporal bone with the parietal bone. It is a flat, irregularly shaped suture that is commonly found in the skull. The other options mentioned in the question, such as lambdoid, sagittal, coronal, and anterolateral, do not accurately describe the suture between the parietal and temporal bone.

The regions of the vertebral column that consist of fused vertebrae are the sacrum and the coccyx. The sacrum is a triangular bone located at the base of the spine, formed by the fusion of five sacral vertebrae. It connects the vertebral column to the pelvic girdle. The coccyx, also known as the tailbone, is a small triangular bone at the bottom of the vertebral column. It consists of four fused coccygeal vertebrae and provides attachment for various muscles and ligaments.

Paranasal sinuses are air-filled spaces within the bones of the skull that are connected to the nasal cavity. They help to lighten the weight of the skull and produce mucus that moisturizes the nasal passages. The paranasal sinuses are found in several bones, including the frontal bone, sphenoid bone, ethmoid bone, and maxillae. However, the lacrimal bones, which are located in the inner corner of the eye socket, do not contain paranasal sinuses.

The given answer is correct because the sacrum is a triangular bone located at the base of the spine, between the two hip bones. It forms the posterior wall of the pelvis and provides support to the lower back.

The cranial bones serve multiple functions including the protection of the brain, attachment of muscles that move the head, protection of the special sense organs, attachment to the meninges, and attachment of muscles that produce facial expressions. Therefore, the correct answer is 1, 2, 3, 4, and 5.

Membrane-filled spaces between cranial bones that enable the fetal skull to modify its size and shape for passage through the birth canal are called fontanels.

During fetal development, the primary vertebral curves that appear are the cervical curve (1), thoracic curve (2), and lumbar curve (3). The coccyx curve (4) and sacral curve (5) are not primary curves and do not appear during fetal development. Therefore, the correct answer is 2 and 5.