Post on 20-Oct-2021
MRI ANATOMY OF THE CRANIAL NERVES
Alexandra Borges
Radiology Dpt.
Instituto Português de Oncologia de Lisboa
SENR 2014
CRANIAL NERVES
• Olfactory: I
• Optic: II
• Oculomotor nerves: III, IV, VI
• Trigeminal nerve: (V1, V2, V3)
• Facial nerve (VII)
• Vestibulochoclear (VIII)
• Glossopharyngeal (IX)
• Vagus (X)
• Spinal accessory (XI)
• Hypoglossal nerve (XII)
CRANIAL NERVES: Anatomy
• Segments:
– Brainstem/ fascicular
– Cisternal
(cavernous sinus CNs III, IV, VI)
– Skull base
– Exocranial
Borges A, Casselman J. "Imaging the cranial nerves Part I”. Eur Radiol 17(8):2112-2125, 2007
3DFT CISS
MR FSE T2W 3DFT-CISS SE T1W pre- and post gad
3DFT-MPRAGE
TR 4000 12.25 684 11.6
TE 99 5.9 20 4.9
FA 180º 70º 90º 12º
Acq. time 3 7.14 5.31 10.51
Thick 4 0.7 2 1
Matrix 242x512 192x256 160x256 192x256
FOV 300 95 230 240
Pixel size 0.62x0.59 0.49x0.37 0.90x0.90 0.94x0.94
CNs MR IMAGING TECHNIQUE
OLFACTORY NERVE
OLFACTORY NERVE
From Ric Harnsberger Imaging anatomy
OPTIC NERVE
From Ric Harnsberger Imaging anatomy
SE T1W
FSE T2W
OPTIC NERVE SE T1W
STIR
OPTIC NERVE
OPTIC NERVE CE SE T1W
CN III (OCULOMOTOR NERVE) From Ric Harnsberger Imaging anatomy
CN III
CN III
CN III:
Inferior rectus
Inferior oblique Medial rectus
Levator palpebrae Superior rectus
Superior division
Inferior division
From Ric Harnsberger Imaging anatomy
CN IV (TROCHLEAR NERVE)
Borges A, Casselman J. "Imaging the cranial nerves Part I” EJR, 2007
From Ric Harnsberger Imaging anatomy
CN IV
Borges A, Casselman J. "Imaging the cranial nerves Part I”
CN IV
Superior oblique
Superior oblique
FSE T2W CE FATSAT T1W
CN VIn
CN VI (ABDUCENS NERVE)
CN VI
CN VI
TRIGEMINAL NERVE (CN V)
The largest of the cranial nerves
Provides:
Sensory input from the face
Motor innervation to the muscles of mastication
BRAINSTEM SEGMENT
Mn
CSn
Mes.n
STn
Sag SE T1W
Axial FSE T2W
CISTERNAL SEGMENT/MECKEL’S CAVE
Axial CISS
Axial CISS Cor SE T1W
Sag SE T1W
MECKEL’S CAVE
Post Gad Sag SE T1W
Axial CISS Axial CISS
FSE T2W
MOTOR ROOT CAVERNOUS SEGMENT
Cor CISS
Post Gad SENSE
Borges A, Casselman J. "Imaging the cranial nerves Part I”
V1 (Ophthalmic division)
Post Gad SENSE
Axial CT
Lacrimal Frontal Nasocilliary
V2 (Maxillary division)
Courtesy Dr. Jan Casselman
Cor CT
Post Gad SENSE
Cor FSE T2W
SENSE T1W
V3 (Mandibular division)
V3 MOTOR
V3 SENSORY
Post Gad Cor SENSE
Axial CT
Post Gad Sag FAT SAT SE T1W
V3
Masticator branch
Mylohyoid branch
Thank you very much for your attention!