Limits...
Secrets of the Cranial Nerves

Smirniotopoulos, M.D. JGSM - MedPix (2014)

View Article: MedPix Image - MedPix Topic

Affiliation: Uniformed Services University

AUTOMATICALLY GENERATED EXCERPT
Please rate it.

Except for the olfactory nerve, all sensory nerves (brainstem and spinal) have a synapse in the thalamus before signaling to the cerebral cortex... The trochlear nerve is also the only motor nerve that crosses the midline (decussates), just before it leaves the dorsal midbrain (tectum) - so that the left 4th nucleus supplies the right trochlear nerve & right superior oblique muscle and vice versa for the left orbit... Peripheral nerves are myelinated by Schwann cells... The optic nerve (2) enters the orbit through the optic canal; all the other nerves (3,4,5-1,6) enter through the superior orbital fissure... The oculomotor (3) leaves the midbrain, passes through the interpeduncular cistern, the cavernous sinus, the superior orbital fissure, and branches into a superior division (levator, superior rectus); and, inferior (medial, inferior rectus & oblique, ciliary muscle (focus the lens), iris sphincter (shrinks pupil)... The Edinger-Westphal parasympathetic nucleus controls pupil constriction... They are anterolateral to the cerebral aqueduct, in the midbrain tegmentum at the superior... It is analogous to the spinal motor nerves, but ascends to leave the skull through the jugular foramen (anterior - pars nervosa)... The superior orbital fissure is shared by the oculomotor (3), trochlear (4), trigeminal (5-ophthalmic branch), and abducens (6) nerves... The three branches of the trigeminal: 5-1 ophthalmic (sup. orbital fissure); 5-2 maxillary (f. rotundum); and, 5-3 maxillary (f. ovale). (S – R – O) The cranial nerves of the cavernous sinus: 3,4,5-1, 5-2 are in the lateral wall; and, 6 is inside the sinus, adjacent to the carotid artery (where it may be affected by cavernous ICA aneurysms)... The internal auditory canal holds four nerves: facial (7); cochlear branch of 8; and, superior and inferior vestibular nerves (branches of 8)... The glossopharyngeal (9), vagus (10), and spinal accessory (11) all share the same jugular foramen (pars nervosa)... The hypoglossal (12) has its own foramen (the hypoglossal canal).

No MeSH data available.


All of the cranial nerves enter/exit from the base of the brain or the ventral side - EXCEPT, the fourth or trochlear nerve, which exits the dorsal brainstem at the junction of the midbrain and pons.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=MPX2739&req=5

MPX2739_synpic60009: All of the cranial nerves enter/exit from the base of the brain or the ventral side - EXCEPT, the fourth or trochlear nerve, which exits the dorsal brainstem at the junction of the midbrain and pons.


Secrets of the Cranial Nerves

Smirniotopoulos, M.D. JGSM - MedPix (2014)

All of the cranial nerves enter/exit from the base of the brain or the ventral side - EXCEPT, the fourth or trochlear nerve, which exits the dorsal brainstem at the junction of the midbrain and pons.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=MPX2739&req=5

MPX2739_synpic60009: All of the cranial nerves enter/exit from the base of the brain or the ventral side - EXCEPT, the fourth or trochlear nerve, which exits the dorsal brainstem at the junction of the midbrain and pons.

View Article: MedPix Image - MedPix Topic

Affiliation: Uniformed Services University

AUTOMATICALLY GENERATED EXCERPT
Please rate it.

Except for the olfactory nerve, all sensory nerves (brainstem and spinal) have a synapse in the thalamus before signaling to the cerebral cortex... The trochlear nerve is also the only motor nerve that crosses the midline (decussates), just before it leaves the dorsal midbrain (tectum) - so that the left 4th nucleus supplies the right trochlear nerve & right superior oblique muscle and vice versa for the left orbit... Peripheral nerves are myelinated by Schwann cells... The optic nerve (2) enters the orbit through the optic canal; all the other nerves (3,4,5-1,6) enter through the superior orbital fissure... The oculomotor (3) leaves the midbrain, passes through the interpeduncular cistern, the cavernous sinus, the superior orbital fissure, and branches into a superior division (levator, superior rectus); and, inferior (medial, inferior rectus & oblique, ciliary muscle (focus the lens), iris sphincter (shrinks pupil)... The Edinger-Westphal parasympathetic nucleus controls pupil constriction... They are anterolateral to the cerebral aqueduct, in the midbrain tegmentum at the superior... It is analogous to the spinal motor nerves, but ascends to leave the skull through the jugular foramen (anterior - pars nervosa)... The superior orbital fissure is shared by the oculomotor (3), trochlear (4), trigeminal (5-ophthalmic branch), and abducens (6) nerves... The three branches of the trigeminal: 5-1 ophthalmic (sup. orbital fissure); 5-2 maxillary (f. rotundum); and, 5-3 maxillary (f. ovale). (S – R – O) The cranial nerves of the cavernous sinus: 3,4,5-1, 5-2 are in the lateral wall; and, 6 is inside the sinus, adjacent to the carotid artery (where it may be affected by cavernous ICA aneurysms)... The internal auditory canal holds four nerves: facial (7); cochlear branch of 8; and, superior and inferior vestibular nerves (branches of 8)... The glossopharyngeal (9), vagus (10), and spinal accessory (11) all share the same jugular foramen (pars nervosa)... The hypoglossal (12) has its own foramen (the hypoglossal canal).

No MeSH data available.