Читать книгу Anatomy for the Royal College of Radiologists Fellowship - Malcolm Sperrin - Страница 9

1 Name the anatomical variant.

2 Name the arrowed structure.

3 Name the arrowed structure.

4 Name the arrowed structure.

5 Name the arrowed structure.

Answers

1 Metopic suture.

2 Left frontozygomatic suture.

3 Left coronoid process of the mandible.

4 Right superior orbital fissure.

5 Right pterion.

Comments:

The frontal bone of the skull is separated from the two parietal bones by the coronal suture. The parietal bones meet at the sagittal suture, which forms a ‘T-junction’ with the coronal suture at a point called the bregma. The point at which the sagittal suture meets the lambdoid suture, separating the parietal bones from the occipital bone, is known as the lambda.

The temporal bones join the parietal bones at the squamous sutures. The junction where the coronal and squamous sutures, and the frontal, parietal, temporal and sphenoid bones converge is known as the pterion.

Exam tips:

 A metopic suture, which is found most commonly in infants but which may persist into adulthood, is an exam favourite. If the question asks for an anatomical variant, and the image presented is of the skull, there’s a good chance that you’ll find a metopic suture.

 Remember to be specific if the arrows are clearly pointing to a specific part of a larger structure (e.g. the coronoid process of the mandible).