Читать книгу Anatomy for the Royal College of Radiologists Fellowship - Malcolm Sperrin - Страница 15

1 Name the arrowed structure.

2 Name the arrowed structure.

3 Name the arrowed structure.

4 Name the arrowed structure.

5 Name the arrowed structure.

Answers

1 Splenium of the corpus callosum.

2 Tectal (quadrigeminal) plate.

3 Pituitary gland.

4 Mamillary body.

5 Genu of the corpus callosum.

Comments:

The midline sagittal section commonly appears in examinations because it demonstrates a lot of anatomy. It is important to recognise the brainstem structures of the midbrain, pons and medulla, and also the cerebral aqueduct and fourth ventricle.

The midbrain is divided by the plane of the cerebral aqueduct into the larger tegmentum ventrally and the smaller tectum dorsally. The tectum is often referred to as the tectal (quadrigeminal) plate, and is readily identifiable on sagittal images.

The corpus callosum links the right and left cerebral hemispheres and is divided into four main parts from anterior to posterior: the rostrum, the genu (knee), the body, and finally the more bulbous splenium (meaning bandage). Additionally, the thin section between the body and splenium is sometimes described as the isthmus.

The thalami sit on either side of the third ventricle. They are connected by a band of tissue called the massa intermedia (interthalamic adhesion), although this is not present in all patients.

Exam tip:

 Note that some of the structures in the upper spine are demonstrated here—including the dens and the anterior and posterior arches of C1.