Quick Answer: What Do The 12 Cranial Nerves Do?

What is the 12th cranial nerve?

The Hypoglossal Nerve is the 12th Cranial Nerve (Cranial Nerve XII).

It is mainly an efferent nerve for the tongue musculature.

The nerve originates from the medulla and travels caudally and dorsally to the tongue..

What is the only cranial nerve to extend beyond the head neck region?

vagus nerveCranial nerves supply sensory and motor information to structures of the head and neck, controlling the activity of this region. Only the vagus nerve extends beyond the neck, to innervate thoracic and abdominal viscera.

Which cranial nerve is responsible for vision?

The optic nerve is the sensory nerve for vision. It transmits information from the eyes to the brain. The oculomotor, trochlear, and abducen nerves are responsible for movement of the eyes.

What is the smallest cranial nerve?

trochlear nerveThe trochlear nerve (CN4) is the smallest cranial nerve yet has the longest pathway. It is susceptible during closed head injury. The abducens nerve (CN6) exits the ventral pons and ascends the clivus to reach the cavernous sinus. It is prone to injury with changes in intracranial pressure.

Which is the longest cranial nerve?

vagus nerveThe 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.

Is cranial nerve 8 sensory or motor?

Table of cranial nervesNo.NameSensory, motor, or bothVIIFacialBoth sensory and motorVIIIVestibulocochlear In older texts: auditory, acoustic.Mostly sensoryIXGlossopharyngealBoth sensory and motorXVagusBoth sensory and motor9 more rows

Is the vagus nerve sensory or motor?

The vagus nerve is the longest cranial nerve. It contains motor and sensory fibers and, because it passes through the neck and thorax to the abdomen, has the widest distribution in the body. It contains somatic and visceral afferent fibers, as well as general and special visceral efferent fibers.

How can I remember the nerves in my brain?

Remembering cranial nerve names in order of CN I to CN XII:On old Olympus’s towering top a Finn and German viewed some hops. … Ooh, ooh, ooh to touch and feel very good velvet. Such heaven!

How do you test oculomotor nerve?

LIGHT REFLEX TESTING When light is directed toward eye, CN II (Optic – sensory nerve) will carry the input to CN III. Light directed toward either eye will immediately stimulate CN III in both eyes. Thus, both pupils constrict in reponse to light directed into either eye.

What are the 12 cranial nerves and their function?

This article will explore the functions of the cranial nerves and provide a diagram.Diagram.I. Olfactory nerve. The olfactory nerve transmits information to the brain regarding a person’s sense of smell. … II. Optic nerve. … III. Oculomotor nerve. … IV. Trochlear nerve. … V. Trigeminal nerve. … VI. … VII.More items…•

How do you test for cranial nerve 12?

The 12th (hypoglossal) cranial nerve is evaluated by asking the patient to extend the tongue and inspecting it for atrophy, fasciculations, and weakness (deviation is toward the side of a lesion).

What are the names of 12 cranial nerves?

The 12 Cranial NervesI. Olfactory nerve.II. Optic nerve.III. Oculomotor nerve.IV. Trochlear nerve.V. Trigeminal nerve.VI. Abducens nerve.VII. Facial nerve.VIII. Vestibulocochlear nerve.More items…

Does brain MRI show cranial nerves?

MRI of the Cranial Nerves—More than Meets the Eye: Technical Considerations and Advanced Anatomy. Magnetic resonance (MR) imaging is the method of choice to evaluate the cranial nerves. Although the skull base foramina can be seen on CT, the nerves themselves can only be visualized in detail on MR.

Is Vagus a nerve?

Vagus nerve, also called X cranial nerve or 10th cranial nerve, longest and most complex of the cranial nerves. The vagus nerve runs from the brain through the face and thorax to the abdomen. It is a mixed nerve that contains parasympathetic fibres.

Do all cranial nerves remain in the skull?

The cranial nerves are all located on the underside of your brain inside your skull.

What is the name of cranial nerve III?

oculomotor nerveThe oculomotor nerve (the third cranial nerve; CN III) has three main motor functions: Innervation to the pupil and lens (autonomic, parasympathetic) Innervation to the upper eyelid (somatic) Innervation of the eye muscles that allow for visual tracking and gaze fixation (somatic)

What do the cranial nerves do?

The cranial nerves serve functions such as smell, sight, eye movement, and feeling in the face. The cranial nerves also control balance, hearing, and swallowing.

Are the 12 cranial nerves sensory or motor?

Cranial nerves I, II, and VIII are pure sensory nerves. Cranial nerves III, IV, VI, XI, and XII are pure motor nerves. Cranial nerves V, VII, IX, and X are mixed sensory and motor nerves. The olfactory nerve (CN I) contains special sensory neurons concerned with smell.