Cranial nerves essay

The cochlear nerve transmits information from the cochleaallowing sound to be heard. When damaged and extended, the tongue will move towards the weaker or damaged side, as shown in the image. The spinal accessory nerve allows the trapezius muscle and sternocleidomastoid muscle to control the movements of the head.

The optic nerve II passes through the optic foramen in the sphenoid bone as it travels to the eye. Damage to the accessory nerve XI will lead to ipsilateral weakness in the trapezius muscle.

This object may be Cranial nerves essay finger or a pin, and may be moved at different directions to test for pursuit velocity.

Strokes typically also affect the seventh cranial nerve by cutting off blood supply to nerves in the brain that signal this nerve and so can present Cranial nerves essay similar symptoms. The optic nerve is involved in the sense of sight.

Each cranial nerve pair controls specific functions of the human body. The olfactory nerve is involved in the sense of smell. Individuals suffering from a lesion to the oculomotor nerve may compensate by tilting their heads to alleviate symptoms due to paralysis of one or more of the eye muscles it controls.

In blunt traumathe facial nerve is the most commonly injured cranial nerve. These nerves control the small muscles that move the eye and also provide sensory innervation to the eye and orbit. These foramina and canals may contain more than one cranial nerve and may also contain blood vessels.

In addition, these nerves allow us to feel pain, indicating when there is a serious problem that requires medical intervention. The maxillary division of the trigeminal nerve V2 passes through foramen rotundum in the sphenoid bone to supply the skin of the middle of the face.

This is due to impairment in the superior oblique musclewhich is innervated by the trochlear nerve.

Damage to the nerve at lower motor neuron level may lead to fasciculations or atrophy of the muscles of the tongue. Both or one eye may be affected; in either case double vision diplopia will likely occur because the movements of the eyes are no longer synchronized. This nerve has access to the cerebral cortex, but does not pass through the thalamus like other cranial nerves.

Other nerves pass through bony canals, longer pathways enclosed by bone. The hypoglossal nerve allows the tongue to move properly. The fasciculations of the tongue are sometimes said to look like a "bag of worms". These fibers terminate in the upper part of the nasal cavity and function to convey impulses containing information about odors to the brain.

Intensely smelling substances, for example ammonia, may lead to the activation of pain receptors nociceptors of the trigeminal nerve that are located in the nasal cavity and this can confound olfactory testing. Combined, these nerves provide sensation to the skin of the face and also controls the muscles of mastication chewing.

If there is suspicion of a change in the sense of smell, each nostril is tested with substances of known odors such as coffee or soap. This can be tested by asking the subject to raise their shoulders or shrug, upon which the shoulder blade scapula will protrude into a winged position.Cranial nerves are the nerves that emerge directly from the brain (including the brainstem), in contrast to spinal nerves (which emerge from segments of the spinal cord).

10 of 12 of the cranial nerves originate in the brainstem. Cranial nerves relay information between the brain and parts of the body, primarily to and from regions of the head. Free Essay: Cranial Nerve Palsy: with an Emphasis on Sixth Cranial Nerve Palsy Cranial Nerve Palsy With an Emphasis on Sixth Cranial Nerve Palsy I.

Cranial Nerve Palsy Essay; Cranial Nerve Palsy Essay. Words Jun 10th What are Cranial Nerves? * Cranial nerves are nerves that come directly from the brain stem in contrast to spinal. Cranial Nerves The human body is a unique and fascinating entity.

There is not much notice taken of the features the human body is capable of. The brain is necessary to perform day-to-day actions, such as the ability to speak, and see amongst us.

Free Essay: Cranial Nerves The human body is a unique and fascinating entity. There is not much notice taken of the features the human body is capable of. The Brain and Cranial Nerves Essay examples Words | 7 Pages The Brain and Cranial Nerves One of the most complex and fascinating things in.

Cranial Nerves The brain and spinal cord (CNS) are connected to parts of the body by nerves and cell bodies called the peripheral nervous system.

Cranial nerves

The PNS contains all of the nervous tissue outside the brain and spinal cord.

Cranial nerves essay
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