The vestibulocochlear nerve is responsible for the sense of hearing and balance (body position sense). The glossopharyngeal nerve enervates muscles involved in swallowing and taste. Lesions of the ninth nerve result in difficulty swallowing and disturbance of taste.
What is the pathway of the cranial nerves?
Simply put, cranial nerves connect centrally to cranial nerve nuclei which is where cranial motor nerves begin, or where cranial sensory nerves terminate. Remember, nerve fibers leaving the brain are considered efferent fibers, where nerves fibers entering the brain are considered afferent fibers.
Which cranial nerve controls the head?
Cranial nerve XI is responsible for tilting and rotating the head, elevating the shoulders, and adducting the scapula. Most of the fibers of the accessory nerve originate in neurons situated in the upper spinal cord.
What nerve goes from the body to the brain?
Cranial nerves and spinal nerves. Nerves that directly connect the brain and the brain stem with the eyes, ears, nose, and throat and with various parts of the head, neck, and trunk are called cranial nerves. There are 12 pairs of them (see Overview of the Cranial Nerves.
What is the main function of CN I?
CNs have sensory (afferent) and motor (efferent) functions. CN I and CN II convey sensory information. All the other CNs originate from the brainstem nuclei (the hypoglossal nerve is located at the border of the spinal cord) and include sensory axons as well as motor axons.
What is 6th cranial nerve?
Cranial nerve six (CN VI), also known as the abducens nerve, is one of the nerves responsible for the extraocular motor functions of the eye, along with the oculomotor nerve (CN III) and the trochlear nerve (CN IV).
Which nerves go through openings in the skull and stimulate the head and neck?
Cranial nerves go through openings in the skull and stimulate regions of the head and neck. Spinal nerves stimulate the rest of the body. The cell bodies of cranial and spinal nerves are arranged in clusters called ganglia.
Why is it called trigeminal nerve?
Its name (“trigeminal” = tri-, or three, and – geminus, or twin: thrice-twinned) derives from each of the two nerves (one on each side of the pons) having three major branches: the ophthalmic nerve (V1), the maxillary nerve (V2), and the mandibular nerve (V3).
What does the 11th cranial nerve control?
Anatomical terms of neuroanatomy The accessory nerve is a cranial nerve that supplies the sternocleidomastoid and trapezius muscles. It is considered as the eleventh of twelve pairs of cranial nerves, or simply cranial nerve XI, as part of it was formerly believed to originate in the brain.
What number is trigeminal nerve?
Neuroanatomy, Cranial Nerve 5 (Trigeminal)
Is the vagus nerve a cranial nerve?
The vagus nerve (cranial nerve [CN] X) is the longest cranial nerve in the body, containing both motor and sensory functions in both the afferent and efferent regards.
How are nerves connected to the brain?
Spinal Cord This portion of the central nervous system runs down the inside of the spinal column, connecting the brain with nerves going to the rest of the body.
Where do the nerves cross in the brain?
In other words, fibers that originated in the right cerebral cortex will cross over in the medulla and innervate muscles on the left side of the body. Decussation refers to the point at which the fibers cross the midline.
What are the 14 cranial nerves?
The nerves are: the olfactory nerve (I), the optic nerve (II), oculomotor nerve (III), trochlear nerve (IV), trigeminal nerve (V), abducens nerve (VI), facial nerve (VII), vestibulocochlear nerve (VIII), glossopharyngeal nerve (IX), vagus nerve (X), accessory nerve (XI), and the hypoglossal nerve (XII).
What is the third nerve?
The oculomotor nerve is the third cranial nerve (CN III). It allows movement of the eye muscles, constriction of the pupil, focusing the eyes and the position of the upper eyelid. Cranial nerve III works with other cranial nerves to control eye movements and support sensory functioning.
What is the most important cranial nerve?
Tenth cranial nerve: The tenth cranial nerve, and one of the most important, is the vagus nerve. All twelve of the cranial nerves, the vagus nerve included, emerge from or enter the skull (the cranium), as opposed to the spinal nerves which emerge from the vertebral column.