The cranial nerves are an essential gathering of nerves, all of which proceed directly to the cerebrum rather than through the spinal cord. The cranial nerves have a really functions basic for everyday life, so they turn out to be vital to physicians, and additionally patients affected by disorders of cranial nerve performance.
There are certainly overall 12 sets of cranial nerves that come from our brain and brain stem. All of them bears various functions regarding different sensory faculties of body. Aside from sensory functions there are some that work as motor nerves and also mixed nerves. The following is a quick explanation of 12 cranial nerves.
Structure and functions cranial nerves:
Olfactory Nerve helps in sense of smell:
It is a kind of sensory nerve that has contributed in the sense of smell in human. These generally provide the exact cells that are known as olfactory epithelium. It possess the info from nasal epithelium to the olfactory centre in brain.
Optic nerve helps in sends the signals to the brain:
The optic nerve sends electric signals from the eye to the brain, which modifies these signals into a picture of what we see around us. Problems of the optic nerve, like optic neuritis, can cause visual disruptions and even blindness.
Oculomotor nerve performing diverse functions:
It is a type of motor nerve that services to various centers along midbrain. Its works involve superiorly uplifting eyelid, superiorly rotating eyeball, construction of pupil on the contact with light and in service many eye muscles.
Trochlear nerve responsible for eyeball movement:
Cranial Nerve IV is the trochlear nerve, which handles a muscle that goes the eyeball down and out. A lesion on this nerve may cause diplopia, and this can be enhanced by tilting the head off of the affected eye.
Trigeminal nerve has a bulk of functions:
It is a sort of major cranial nerve in total and works a lot of sensory functions regarding nose, eyes, tongue and teeth. It generally further separated in 3 branches which are ophthalmic, maxillary and mandibular nerve. This is a kind of mixed nerve that works for sensory and motor functions in human brain.
Abducent nerve responsible of flipping eye laterally:
It is once again a form of motor nerve that services to the pons and execute function of flipping eye laterally.
Facial nerve helps in sensation of taste:
Facial nerve services the muscles of face and that’s exactly why known as facial nerve. It includes sensory fibres for facial and also taste sensations. Moreover it has parasympathetic fibres that delivers goods to different glands etc.
Vestibulocochlear nerve helps in balancing of head:
This motor nerve is actually functional in delivering information regarding balance of head and feeling of sound or hearing. It has vestibular along with cochlear info to the brain which is placed near inner ear.
Glossopharyngeal nerve takes info form the pharynx:
This is a sensory nerve which takes sensory info from pharynx (preliminary part of throat) as well as some part of tongue and palate. The info sent is related to temp, pressure along with related facts.
Vagus nerve executes tons of functions:
This is a sort of mixed nerve that includes both motor and sensory functions. This mainly relates to the portion of pharynx, larynx, oesophagus, trachea, bronchi, and certain area of heart and palate . It functions by constricting muscles of the above spots. In sensory section, it contributes in the tasting capability of the human.
Spinal accessory nerve in triggering the contraction of sternocleidomastoid muscle:
Cranial Nerve XI is simpler than its immediate predecessors. It has only one major work: to trigger the contraction of the sternocleidomastoid muscle along with the trapezius so as to help move the head or shoulder. Problems of this nerve minimize the capability to use these muscles.
Hypoglossal nerve handles all the actions of tongue:
Finally, the hypoglossal nerve handles all the actions of the tongue. Trouble in speaking (dysarthria) is one possible consequence of a affected hypoglossal nerve.
- Olfactory Nerve helps in sense of smell.
- Optic nerve helps in sends the signals to the brain.
- Oculomotor nerve performing diverse functions.
- Trochlear nerve responsible for eyeball movement.
- Trigeminal nerve has a bulk of functions.
- Abducent nerve responsible of flipping eye laterally.
- Vestibulocochlear nerve helps in balancing of head.
- Vagus nerve executes tons of functions.
- Spinal accessory nerve in triggering the contraction of sternocleidomastoid muscle.
- Hypoglossal nerve handles all the actions of tongue.