Training Collections
Library Memberships
On-demand course library with video lectures, expert case reviews, and more
Fellowship Certificate™ Programs
Practice-focused training programs designed to help you gain experience in a specific subspecialty area.
Ultimate Learning Pass
Unlock access to our full Course Library and all self-paced Fellowships.
Continuing Medical Education (State CME)
Complete all of your state CME requirements in one convenient place.
Noon Conference (Free)
Get access to free live lectures, every week, from top radiologists.
Case of the Week (Free)
Get a free weekly case delivered right to your inbox.
Case Crunch: Rapid Case Review (Free)
Register for free live board reviews.
Dr. Resnick's MSK Conference
Learn directly from the MSK Master himself.
Lower Extremities MRI Conference
Musculoskeletal Imaging
Emergency Imaging
PET Imaging
Pediatric Imaging
For Training Programs
Supplement your training program with case-based learning for residents, registrars, fellows, and more.
For Private Practices
Upskill in high growth, advanced imaging areas.
Compliance
NewTrack, fulfill, and report on all your radiologists' credentialing and licensing requirements.
Emergency Call Prep
Prepare trainees to be on call for the emergency department with this specialized training series.
Training Collections
Library Memberships
On-demand course library with video lectures, expert case reviews, and more
Fellowship Certificate™ Programs
Practice-focused training programs designed to help you gain experience in a specific subspecialty area.
Ultimate Learning Pass
Unlock access to our full Course Library and all self-paced Fellowships.
Continuing Medical Education (State CME)
Complete all of your state CME requirements in one convenient place.
Noon Conference (Free)
Get access to free live lectures, every week, from top radiologists.
Case of the Week (Free)
Get a free weekly case delivered right to your inbox.
Case Crunch: Rapid Case Review (Free)
Register for free live board reviews.
Dr. Resnick's MSK Conference
Learn directly from the MSK Master himself.
Lower Extremities MRI Conference
Musculoskeletal Imaging
Emergency Imaging
PET Imaging
Pediatric Imaging
For Training Programs
Supplement your training program with case-based learning for residents, registrars, fellows, and more.
For Private Practices
Upskill in high growth, advanced imaging areas.
Compliance
NewTrack, fulfill, and report on all your radiologists' credentialing and licensing requirements.
Emergency Call Prep
Prepare trainees to be on call for the emergency department with this specialized training series.
19 topics, 41 min.
Introduction to Gross Anatomy of the Brain
4 m.Frontal Lobar Anatomy
5 m.Sylvian Fissure
3 m.Middle Frontal Gyrus
2 m.Inferior Parietal Lobule
2 m.Central Sulcus of Rolando
3 m.Intraparietal Sulcus
2 m.Localizing the Intraparietal Lobule Part 2
2 m.Localizing the Intraparietal Lobule Part 3
2 m.Pars Marginalis
2 m.Parieto-occipital Sulcus
2 m.Pars Marginalis on Axial Imaging
3 m.Midline Sagittal Commissures
2 m.Basic Brainstem Anatomy
2 m.Midline Cerebellum (Vermis)
3 m.Midline Cisterns and Spaces
2 m.Midline Sagittal Blood Supplies
4 m.Midline Skeletal Anatomy
3 m.Miscellaneous Midline Structures
3 m.52 topics, 2 hr. 14 min.
The Olfactory Nerve – Cranial Nerve I
4 m.The Olfactory Bulb
5 m.The Olfactory Tracts
5 m.The Optic Nerve – Cranial Nerve II
3 m.The Globe and Optic Pathway
5 m.Chiasm & Retrochiasmatic Pathway
3 m.Destinations of Optic Nerve Signals
3 m.The Oculomotor Nerve – Cranial Nerve III
4 m.Oculomotor Nerve: Course, Adjacent Structures & Destination
4 m.Oculomotor Nerve: Nuclei and Intramedullary Course
3 m.Third Nerve Syndromes
5 m.The Trochlear Nerve - Cranial Nerve IV
3 m.Trochlear Nerve: Course and Pathologies
3 m.The Trigeminal Nerve – Cranial Nerve V
3 m.Trigeminal Nerve Synapses in the Brainstem
6 m.Nuclear Anatomy and Position of the Trigeminal System
4 m.Parasympathetic Ganglia Anatomy of the Head and Neck
2 m.MRI anatomy of the Submandibular Ganglion
4 m.MRI Anatomy of the Pterygopalatine Ganglion
3 m.Trigeminal Nerve - V1 Division
2 m.Trigeminal Nerve - V2 Division
2 m.Trigeminal Nerve - V3 Division
3 m.The Abducens Nerve – Cranial Nerve VI
3 m.Cranial Nerves 1-6: Review
3 m.Abducens Nerve Nucleus and Nerve
4 m.Identifying the Cisternal Abducens Nerve
3 m.The Facial Nerve: Nucleus and Intramedullary Course
3 m.The Facial Nerve – Cranial Nerve VII
2 m.Facial Nerve: Medullary, Cisternal, and Canalicular Segments
3 m.Seventh Nerve Segments on MRI
5 m.Facial Nerve: Motor, Sensory, and Parasympathetic Branches
2 m.Proximal Branches of the Facial Nerve
3 m.Distal Branches of the Facial Nerve
2 m.The Posterior Auricular Nerve
2 m.The Greater Petrosal Nerve
2 m.The Vestibulocochlear Nerve – Cranial Nerve VIII
4 m.Cranial Nerves 7 & 8: Cisternal Course at the CPA
2 m.Vestibulocochlear Nerve: Cochlea and Internal Auditory Canal
2 m.Glossopharyngeal Nerve – Cranial Nerve IX
2 m.Glossopharyngeal Nerve Course
2 m.Exit of the Glossopharyngeal Nerve
2 m.Nuclei of the Glossopharyngeal Nerve
3 m.Glossopharyngeal Nerve Summary
2 m.The Vagus Nerve – Cranial Nerve X
2 m.Nuclei of the Vagus Nerve
2 m.The Innervations of the Vagus Nerve
4 m.Function of Vagal Nuclei
3 m.Accessory Nerve – Cranial Nerve XI
2 m.Accessory Nerve Summary
3 m.The Hypoglossal Nerve – Cranial Nerve XII
3 m.The Descent of the Hypoglossal Nerve
2 m.The Real Origin of the Hypoglossal Nerve
2 m.0:00
Now, before I show you some sixth nerve anatomy on MRI,
0:04
let's just do a quick review of what we've
0:06
covered so far in the cranial nerves.
0:08
We talked about the olfactory nerve,
0:09
cranial nerve number one.
0:13
And then as it comes back, we don't show it here,
0:15
it divides up into three or four different segments
0:18
which are outlined in the olfactory section.
0:21
Then we get into the optic nerve.
0:24
The optic nerve starts at the level of the retina.
0:27
You've got photoreceptors in the retina,
0:30
just like you have receptors in the ethmoid
0:32
sinus mucosa for the olfactory nerve.
0:35
And then it comes back as the intracanalicular nerve,
0:37
the optic nerve, the chiasm, the optic tract,
0:41
and then goes on to the lateral geniculate nucleus.
0:44
It has a synapse at the superior colliculus,
0:46
the stria gennari, the calcarine cortex.
0:48
It also has a pulvinar synapse.
0:50
So that's a quick review of the second cranial nerve,
0:53
which some consider an extension of the brain with
0:56
arachnoid around it and a subarachnoid space,
0:59
which you'll be able to see.
1:01
Then we said the third nerve.
1:03
What characterizes the third nerve is its
1:06
exit in the interpeduncular cistern.
1:09
And then we described its course into the ocular
1:12
motor sulcus, then into the cavernous sinus,
1:15
and then on into the orbit where it services
1:18
the extraocular muscles, all of them,
1:20
except for the superior oblique and the lateral rectus.
1:23
Then we get into the fifth nerve, very complex.
1:27
But the fifth nerve is mostly composed of a Portio major,
1:30
which is sensory with three branches:
1:33
an ophthalmic, a maxillary, and a mandibular.
1:37
There's also a Portio minor, which is motor.
1:41
And we'll describe in the fifth nerve section,
1:44
if you go back to it,
1:45
the different structures that are innervated by it.
1:48
Then the characteristics of the trochlear nerve,
1:51
the fourth nerve,
1:52
the one before it are the following,
1:55
it is the one nerve that comes
1:57
out in the back, dorsally in the brain stem,
2:00
and then decussates in the back.
2:01
And then we're back up to the 6th nerve,
2:03
which comes out at the pontomedullary sulcus ventrally.
2:08
Remember the trochlear nerve?
2:10
Dorsally and it starts out lateral.
2:13
Its apparent exit is lateral to the pyramid of the pons.
2:18
Very critical so you don't confuse it with pontine perforators.
2:21
Now, let's take a look on MRI.
Interactive Transcript
0:00
Now, before I show you some sixth nerve anatomy on MRI,
0:04
let's just do a quick review of what we've
0:06
covered so far in the cranial nerves.
0:08
We talked about the olfactory nerve,
0:09
cranial nerve number one.
0:13
And then as it comes back, we don't show it here,
0:15
it divides up into three or four different segments
0:18
which are outlined in the olfactory section.
0:21
Then we get into the optic nerve.
0:24
The optic nerve starts at the level of the retina.
0:27
You've got photoreceptors in the retina,
0:30
just like you have receptors in the ethmoid
0:32
sinus mucosa for the olfactory nerve.
0:35
And then it comes back as the intracanalicular nerve,
0:37
the optic nerve, the chiasm, the optic tract,
0:41
and then goes on to the lateral geniculate nucleus.
0:44
It has a synapse at the superior colliculus,
0:46
the stria gennari, the calcarine cortex.
0:48
It also has a pulvinar synapse.
0:50
So that's a quick review of the second cranial nerve,
0:53
which some consider an extension of the brain with
0:56
arachnoid around it and a subarachnoid space,
0:59
which you'll be able to see.
1:01
Then we said the third nerve.
1:03
What characterizes the third nerve is its
1:06
exit in the interpeduncular cistern.
1:09
And then we described its course into the ocular
1:12
motor sulcus, then into the cavernous sinus,
1:15
and then on into the orbit where it services
1:18
the extraocular muscles, all of them,
1:20
except for the superior oblique and the lateral rectus.
1:23
Then we get into the fifth nerve, very complex.
1:27
But the fifth nerve is mostly composed of a Portio major,
1:30
which is sensory with three branches:
1:33
an ophthalmic, a maxillary, and a mandibular.
1:37
There's also a Portio minor, which is motor.
1:41
And we'll describe in the fifth nerve section,
1:44
if you go back to it,
1:45
the different structures that are innervated by it.
1:48
Then the characteristics of the trochlear nerve,
1:51
the fourth nerve,
1:52
the one before it are the following,
1:55
it is the one nerve that comes
1:57
out in the back, dorsally in the brain stem,
2:00
and then decussates in the back.
2:01
And then we're back up to the 6th nerve,
2:03
which comes out at the pontomedullary sulcus ventrally.
2:08
Remember the trochlear nerve?
2:10
Dorsally and it starts out lateral.
2:13
Its apparent exit is lateral to the pyramid of the pons.
2:18
Very critical so you don't confuse it with pontine perforators.
2:21
Now, let's take a look on MRI.
Report
Description
Faculty
Stephen J Pomeranz, MD
Chief Medical Officer, ProScan Imaging. Founder, MRI Online
ProScan Imaging
Tags
Paranasal sinuses
Orbit
Oral Cavity/Oropharynx
Neuroradiology
MRI
Head and Neck
Brain
© 2025 Medality. All Rights Reserved.