Cranial Nerves Flashcards
What are the afferent cranial nerve nuclei?
Trigeminal sensory nucleus- fibres carry general sensory info (pain, touch, pressure, temperature) and terminate at this nucleus
Vestibular and cochlear nucleus- fibres carrying special senses of hearing and positional sense run in the vestibulocochlear nerve to these nuclei
Nucleus solitarius - visceral afferents terminate at this nucleus of the medulla
What is the order of the cranial nerves ?
1-olfactory 2-optic 3-oculomotor 4-trochlear 5-trigeminal 6-abducens 7-facial 8-vestibulocochlear 9-glossopharyngeal 10-vagus 11-accessory 12-hypoglossal
What are the efferent cranial nerve nuclei?
Edinger-westphal nucleus Oculomotor nucleus Trochlear nucleus Trigeminal motor nucleus Abducens nucleus Facial motor nucleus Salivatory nuclei Nucleus ambiguus Dorsal motor nucleus of vagus Hypoglossal nucleus
Which nuclei share the embryo logical origin -nuclei of the somatic efferent cell column ?
Oculomotor nucleus
Trochlear nucleus
Abducens nucleus
Hypoglossal nucleus
Which nuclei share the embryo logical origin- nuclei of the branchiomotor cell column?
Trigeminal motor nucleus
Facial motor nucleus
Nucleus ambiguus
Which nuclei share the embryo logical origin- nuclei of the parasympathetic cell column ?
Edinger-Westphal nucleus
Superior and inferior salivatory nucleus
Dorsal motor nucleus of the vagus
Which cranial nerves are sensory ?
Olfactory
Optic
Vestibulocochlear
Which cranial nerves are motor?
Oculomotor Trochlear Abducens Accessory Hypoglossal
Which of the cranial nerves have both sensory and motor control ?
Trigeminal
Facial
Glossopharyngeal
Vagus
What is the function of cranial nerve 1?
The olfactory nerve is a sensory fibre for the nose
What is the function of the olfactory nerve ?
It’s component fibres are sensory and it’s involved in olfaction
It innervates olfactory epithelium via the olfactory bulb
What is the function of the optic nerve ?
It’s component fibres are sensory and they are involved in vision
It innervate retina
What are the functions of the oculomotor nerve ?
Its component motor fibres are involved in the movement of the eye by innervating the superior, inferior and medial rectus, inferior oblique ( it’s able to elevate, depress and addict the eye) and levator palebrae muscles
- motor neurons going to these extra ocular muscles have their cell bodies in the oculomotor nucleus
Its component parasympathetic fibres are involved in pupil construction and accommodation by innervating pupillary constrictor and ciliary muscles of the eye via ciliary ganglion
-these preganglionic fibres arise from the Edinburgh-Westphal nucleus
What are the functions of the trochlear nerve ?
It’s component motor fibres are involved in the movement if the eye by innervating the superior oblique muscle (moves eye downwards and medially)
- the motor neurons arise from the trochlear nucleus
IT IS THE ONLY CRANIAL NERVE THAT EMERGES FROM THE DORSAL ASPECT OF THE BRAINSTEM.
What are the functions of the trigeminal nerve ?
It’s component sensory fibres are involved in general sensations by innervating the face, scalp, cornea, nasal and oral cavities and cranial dura mater
It’s component motor fibres are involved in opening and closing of the mouth by innervating the muscles of mastication and they are also involved in tension on tympanic membrane by innervating tensor tympani muscles