Question

In the Towne projection of the skull, with the CR directed 30 degree caudad to the OML and passing midway between the EAM, which of the following is best demonstrated?

a. Facial bones
b. Frontal bone
c. Occipital bone
d. Basal foramina

Answer 1

The Towne projection is used to best demonstrate the occipital bone of the skull.

Step-by-step explanation:

The Towne projection is a radiographic technique used to view the skull from a specific angle. In this projection, the central ray (CR) is directed 30 degrees caudad to the OML (orbitomeatal line) and passes midway between the external auditory meatus (EAM). This projection is commonly used to best demonstrate the occipital bone of the skull. In the Towne projection of the skull, where the central ray (CR) is directed 30 degrees caudad to the OML (Orbitomeatal Line) and passing midway between the External Acoustic Meatus (EAM), the structure best demonstrated is the occipital bone. This radiographic positioning aims to visualize the occipital bone and the foramen magnum, as well as to demonstrate the basal foramina without superimposition. The Towne projection is particularly useful for assessing fractures of the occipital bone and for post-operative evaluation of the posterior fossa. It does not optimally demonstrate structures such as the facial bones, frontal bone, or significant portions of the cranial vault.