Innervates the superior oblique muscle, which depresses, rotates laterally, and intorts the eyeball. Located in the superior orbital fissure.
V
Trigeminal
Both sensory and motor
Pons
Principal sensory trigeminal nucleus, Spinal trigeminal nucleus,Mesencephalic trigeminal nucleus, Trigeminal motor nucleus
Receives sensation from the face and innervates the muscles of mastication. Located in the superior orbital fissure (ophthalmic nerve - V1), foramen rotundum (maxillary nerve - V2), and foramen ovale (mandibular nerve- V3).
VI
Abducens
Mainly motor
Nuclei lying under the floor of the fourth ventricle Pons
Abducens nucleus
Innervates the lateral rectus, which abducts the eye. Located in the superior orbital fissure.
The pupillary light reflex is a reflex that controls the diameter of the pupil, in response to the intensity of light that falls on the retina of the eye, thereby assisting in adaptation to various levels of darkness and light. Greater intensity light causes the pupil to become smaller, whereas lower intensity light causes the pupil to become larger.
77. Trigeminal nerve: 1st, 2nd snd 3rd branches of the trigeminal nerve, relation, supply region
Trigeminal nerve develops in association with the firest visceral arch and is mixed. It’s sensory fibers supply the skin of face and anterior part of the head.
The first branch ophthalamic nerve passes out of the cranial cavity into the orbit through the fissure orbitalis superior: 1) frontal nerve; 2) lacrimal nerve, 3) nasociliary nerve.
The second branch maxillary nerve emerges from the cranial cavity through the foramen rotundum into the pterigopalatine fossa: 1) zygomatic nereve; 2) superior dental nerves; 3) ganglionic branches;
The third branch the mandibular nerve contains whole motor root of trigeminal nerve. It supplies the muscles attached to the mandible, skin covering it. There are 1) muscle and 2) sensory branches.
