Which feature is unique to the axis
Which of these features is only found on thoracic vertebrae?
Thoracic vertebrae are unique among the bones of the spine in that they are the only vertebrae that support ribs and have overlapping spinous processes.
Which features are only found on thoracic vertebrae quizlet?
Rib facets are only found on thoracic vertebrae.
Which of these features is found in a lumbar vertebra?
Distinguishing features of the lumbar vertebrae include a thick and stout vertebral body, a blunt, quadrilateral spinous process for the attachment of strong lumbar muscles, and articular processes that are oriented differently than those found on the other vertebrae.
How do you identify axis vertebrae?
What is part of the thoracic cage?
The thoracic cage (rib cage) forms the thorax (chest) portion of the body. It consists of the 12 pairs of ribs with their costal cartilages and the sternum (Figure 7.5. 1). The ribs are anchored posteriorly to the 12 thoracic vertebrae (T1–T12).
Which bone feature is only found on cervical vertebrae quizlet?
Transverse foramina are found on the cervical vertebrae. Of these bones, which would feel like a small, flat, thin plate in one plane and then have an even smaller thin, flat plate perpendicular to the main plate?
What is unique about the axis vertebra?
The most distinctive characteristic of this bone is the strong Odontoid Process(also known as the “dens”) which rises perpendicularly from the upper surface of the body.It is a prominent rounded superior projection from the body. This tooth-like elevation serves a stable point around which the atlas bone rotates.
What features of the atlas and axis are unique?
The atlas’s chief peculiarity is that it has no body. It is ring-like and consists of an anterior and a posterior arch and two lateral masses. The atlas and axis are important neurologically because the brainstem extends down to the axis.
What makes cervical vertebrae unique?
Typical cervical vertebrae have several features distinct from those typical of thoracic or lumbar vertebrae. The most notable distinction is the presence of one foramen, in each transverse process. These transverse foramina encircle the vertebral arteries and veins.
What is unique about axis C2?
The axis (C2) cervical vertebra is the second vertebra of the spine. It is unique in that it contains the odontoid process — odontoid means “tooth” and that is what this bone looks like — that forms a pivot point on which C1 atlas can rotate. Injuries to the odontoid are common in motor vehicle accidents and falls.
Which structure is peculiar to the axis vertebra?
Dens. The dens, also called the odontoid process or the peg, is the most pronounced projecting feature of the axis. The dens exhibits a slight constriction where it joins the main body of the vertebra.
What is the difference between atlas and axis vertebrae?
The atlas is the first cervical (neck) vertebra which is just under the head; it is named for Atlas, the Greek god who supported the world on his shoulders. The axis is the second cervical vertebra; it has what is called the odontoid process about which the atlas rotates. … It allows the head turn from side to side.
What is so important about the atlas C1 and axis C2 )?
The first 2, C1 and C2, are highly specialized and are given unique names: atlas and axis, respectively. C3-C7 are more classic vertebrae, having a body, pedicles, laminae, spinous processes, and facet joints. C1 and C2 form a unique set of articulations that provide a great degree of mobility for the skull.
Why is C2 called axis?
C2 (cervical vertebra): C2 is the symbol for the second cervical vertebra, which is also called the axis. It is so-named because the uppermost cervical vertebra (called the atlas) rotates about the odontoid process of the second cervical vertebra. … The Latin word “axis” means axle or pole.
What is the function of atlas and axis?
The atlas and axis support the head on the lower cervical spine while providing for considerable mobility in flexion, extension, rotation and lateral bending. The first two vertebrae also function as conduits for the cervical cord and vertebral arteries.
Why are C1 and C2 special?
The C1 and C2 vertebrae are uniquely shaped and have vertebral foramen (spaces within the bone) which allow the vertebral arteries and veins to reach through to the brain and supply it with blood. This unique formation is only seen in the cervical vertebrae.
How do the atlas and axis differ from the other cervical vertebrae?
The main difference between atlas and axis vertebrae is that atlas is the first cervical vertebra, which supports the skull whereas axis is the second cervical vertebra, which forms the pivot upon the atlas. Furthermore, atlas help to hold the head upright while axis allows the head to turn side to side.
How does the structure and function of C1 and C2 differ from that of other vertebrae?
The C1 vertebra, also called atlas, is shaped like a ring. The C2 vertebra has an upward-facing long bony process called the dens. The dens forms a joint with the C1 vertebra and facilitates its turning motions, thereby allowing the head to turn in different directions.