Najea Dixon
Cranial Nerves
The human body consists of many nerves. All in which are located in different parts of the body, and serve different purposes. One part of the human body that consists of nerves that are vital to human survival is the brain. The brain consists of twelve cranial nerves; each serves either one specific function or multiple functions. The twelve cranial nerves that exit the brain through individual apertures in the skull are the olfactory, optic, oculomotor, trochlear, trigeminal, abducens, facial, vestibulocochlear, glossopharyngeal, vagus, accessory and he hypoglossal nerve (Binder). These twelve nerves are divided into three parts; some that are sensory, some that are strictly motor functional and others that are …show more content…
The olfactory nerve is one of the shortest nerves in the brain (Binder). This nerve allows us to have a sense of smell. They are unmyelinated and covered by supporting cells known as schwann cells. The olfactory nerve transmits information through axons collected by the olfactory epithelium and is placed in the olfactory bulb (Pauwels). The olfactory bulbs are located underneath the frontal lobe of the brain and it transmits the odor information from the nose to the brain (Pauwels).
The optic nerve, just as the olfactory nerve, does not join with the brainstem. The optic nerve is located behind the eye and is known as the second cranial nerve (Binder). This nerve is responsible for vision; including color and brightness perception (Binder). It is also responsible for neurological reflexes such as the light reflex and accommodation reflex (Binder). This nerve transfers visual information through visual impulses from the retina to the brain. The optic nerves consist of millions of fibers hat are covered with myelin instead of schwann cells …show more content…
The oculomotor nerve is responsible for the movement of the eye ball and the eye lids (Monkhouse). This nerve has two different components; the somatic and the visceral motor component (Monkhouse). The somatic motor component is responsible for visual tracking and the precise movement of the eyeball (Monkhouse), it also allows fixation of an object . The visceral motor component controls accommodation reflexes and pupillary light with its responsibility for involuntary movement of the ciliary muscles and the constrictor papillae (Pauwels).
The trochlear nerve is also responsible for the movement of the eyeball. This nerve is one of the smallest and the greatest in intracranial length amongst the rest of the cranial nerves (Pauwels). This nerve innervates the superior oblique muscle of the eye and connects to the annular tendon (Pauwels). This allows for the eyeballs to move up and down and outwards. The trochlear nerve is the only cranial nerve that is located dorsally from the brain, thus giving this nerve the longest pathway
Cranial Nerves
The human body consists of many nerves. All in which are located in different parts of the body, and serve different purposes. One part of the human body that consists of nerves that are vital to human survival is the brain. The brain consists of twelve cranial nerves; each serves either one specific function or multiple functions. The twelve cranial nerves that exit the brain through individual apertures in the skull are the olfactory, optic, oculomotor, trochlear, trigeminal, abducens, facial, vestibulocochlear, glossopharyngeal, vagus, accessory and he hypoglossal nerve (Binder). These twelve nerves are divided into three parts; some that are sensory, some that are strictly motor functional and others that are …show more content…
The olfactory nerve is one of the shortest nerves in the brain (Binder). This nerve allows us to have a sense of smell. They are unmyelinated and covered by supporting cells known as schwann cells. The olfactory nerve transmits information through axons collected by the olfactory epithelium and is placed in the olfactory bulb (Pauwels). The olfactory bulbs are located underneath the frontal lobe of the brain and it transmits the odor information from the nose to the brain (Pauwels).
The optic nerve, just as the olfactory nerve, does not join with the brainstem. The optic nerve is located behind the eye and is known as the second cranial nerve (Binder). This nerve is responsible for vision; including color and brightness perception (Binder). It is also responsible for neurological reflexes such as the light reflex and accommodation reflex (Binder). This nerve transfers visual information through visual impulses from the retina to the brain. The optic nerves consist of millions of fibers hat are covered with myelin instead of schwann cells …show more content…
The oculomotor nerve is responsible for the movement of the eye ball and the eye lids (Monkhouse). This nerve has two different components; the somatic and the visceral motor component (Monkhouse). The somatic motor component is responsible for visual tracking and the precise movement of the eyeball (Monkhouse), it also allows fixation of an object . The visceral motor component controls accommodation reflexes and pupillary light with its responsibility for involuntary movement of the ciliary muscles and the constrictor papillae (Pauwels).
The trochlear nerve is also responsible for the movement of the eyeball. This nerve is one of the smallest and the greatest in intracranial length amongst the rest of the cranial nerves (Pauwels). This nerve innervates the superior oblique muscle of the eye and connects to the annular tendon (Pauwels). This allows for the eyeballs to move up and down and outwards. The trochlear nerve is the only cranial nerve that is located dorsally from the brain, thus giving this nerve the longest pathway