LEARN RELATIONSHIPS, NOT ISOLATED NAMES
Anatomy becomes easier when every structure has an address.
Start with the plane and image labels. Find the midline, the outer contour, and a dependable landmark. Then ask what sits anterior, posterior, medial, lateral, superior, and inferior to it. This turns a crowded image into an organized map.
MRI appearance changes with T1, T2, FLAIR, diffusion, susceptibility, fat suppression, and contrast. Cerebrospinal fluid can be bright on one sequence and dark on another. Gray and white matter contrast can reverse. Identify a structure by its location, shape, and connections, not by brightness alone.
Recognizing landmarks supports image quality and planning.
Diagnosing pathology belongs to the qualified interpreting clinician. The technologist uses anatomy to plan coverage, position slices, evaluate technical quality, and recognize when additional clinical review may be needed under policy.
TAKE AN AXIAL SLICE WALK
Move from the vertex toward the skull base.
Near the top of the head, identify the two cerebral hemispheres, cortical gray matter, underlying white matter, interhemispheric fissure, falx, and superior sagittal sinus region.
As you move lower, the deep cerebral white matter becomes more prominent. The bodies of the lateral ventricles appear near the midline, with the corpus callosum arching around the ventricular system.
At the basal ganglia level, find the caudate, putamen, and globus pallidus. The internal capsule runs between the deep gray structures. The paired thalami sit near the third ventricle.
Continue through the temporal lobes, basal cisterns, midbrain, cerebral peduncles, and aqueduct region. The hippocampi sit within the medial temporal lobes and are best followed across more than one plane.
Lower slices show the pons, medulla, fourth ventricle, cerebellar hemispheres, vermis, cerebellopontine angles, and internal auditory canal regions.
Frontal is anterior, occipital is posterior, temporal is inferolateral, and parietal is superior and posterior to the frontal lobe. Boundaries are easier to follow across multiple planes.
Lateral ventricles connect to the third ventricle, then the cerebral aqueduct, fourth ventricle, and subarachnoid spaces.
The midbrain is superior, the pons is central and rounded, and the medulla continues inferiorly toward the cervical spinal cord.
The cerebellar hemispheres lie on either side of the midline vermis. The fourth ventricle sits between the brainstem and cerebellum.
MOVE THROUGH COMPARTMENTS
The skull base connects the brain to the face and neck.
The pituitary gland sits in the sella. The cavernous sinuses and internal carotid artery segments lie to either side. The optic pathways are superior and anterior to the sellar region.
Identify the globes, lenses, optic nerves, extraocular muscles, orbital fat, and orbital apices. Compare the two sides while checking the image labels.
Find the frontal, ethmoid, sphenoid, and maxillary sinuses, then the nasal septum and turbinates. Air and cortical bone usually have very low signal on routine MRI.
Follow the tongue, floor of mouth, soft palate, nasopharynx, oropharynx, hypopharynx, and surrounding deep spaces.
The parotid glands sit lateral and posterior to the mandibular rami. The submandibular glands lie beneath the mandible. The thyroid lobes sit beside the upper trachea.
Follow the carotid arteries and jugular veins through the neck. Use the sternocleidomastoid muscles, vertebrae, airway, and salivary glands to organize nodal and deep neck regions.
Many head and neck structures are paired, so symmetry is a helpful starting point. It is not proof that everything is normal. Normal asymmetry, patient rotation, swallowing, dental artifact, flow, and partial volume can change the appearance. Confirm findings across neighboring slices and planes.
USE S.I.D.E.S.
Orient first, then build the map.
Know whether you are viewing T1, T2, FLAIR, diffusion, susceptibility, or a postcontrast series.
Confirm the imaging plane and the patient's right, left, anterior, and posterior.
Use the falx, ventricles, brainstem, airway, vertebral column, or another central structure.
Separate cerebrum, posterior fossa, skull base, orbits, face, airway, glands, vessels, and neck spaces.
Follow structures through the stack and compare corresponding regions without assuming perfect symmetry.
Remember: Use both S.I.D.E.S. before deciding what is in the middle.
CHECK YOUR ANATOMY MAP
Choose the best landmark or relationship.
Which structure sits between the brainstem and the cerebellum?
The fourth ventricle. It is a useful posterior fossa landmark and part of the cerebrospinal fluid pathway.
Why can you not identify anatomy by brightness alone?
Signal changes with the sequence and tissue properties. Use location, shape, connections, neighboring structures, and multiple planes along with signal behavior.
You see the pituitary gland in the sella. Which important region lies to either side?
The cavernous sinuses and internal carotid artery segments lie lateral to the sella. The exact relationships should be followed across thin slices and multiple planes.
Which landmarks help organize the lower neck?
The airway, thyroid gland, carotid arteries, jugular veins, sternocleidomastoid muscles, vertebrae, spinal canal, and paired soft tissues provide a useful framework.
Why should a learner compare both sides but avoid assuming they must be identical?
Comparison can reveal a difference, but normal asymmetry, positioning, motion, flow, partial volume, and artifact can also change appearance. Keep scrolling and use the complete study.
LESSON 47 COMPLETE
You can move from the cerebrum through the skull base and neck using major landmarks, compartments, and anatomical relationships.Educational references
This lesson is an anatomy overview for education. It does not replace a complete anatomy reference, facility protocol, radiologist interpretation, or clinical diagnosis. Anatomy and signal appearance should be evaluated across the complete study.