Essays on Cranial Nerves

Part A: Cranial Nerves:

There are 12 pairs of cranial nerves emerging from the brain’s underside passing via cranial openings leading to various parts of the head, neck and body trunk. These nerves are naming, and numbering of these nerves is based on their position i.e. from the anterior to the posterior of the brain. In this case, the olfactory nerve is CN1 while CN12 is the hypoglossal nerve (Wissmann, 2013). In this paper, only four of the twelve cranial nerves shall be discussed i.e. the Olfactory nerve (CN1), Oculomotor Nerve (CN-III) which are sensory nerves, and the Trigeminal Nerve (CN-V) and ...

The nervous system (NS) denotes a collection of human body organs as well as connections, which have expressly differentiated cells referred as neurons or other specialized biochemicals, tissues, and supportive cells that assist in the normal working of the human body NS (Swanson, 2015). The human nervous system helps in addressing acquisition, processing, understanding, storing, as well as coordinating or transmitting signals in the body. Therefore, many body organs, as well as sensory organs, possess discrete and different roles. The nervous system (NS) can be categorized into two, that is, peripheral nervous system (PNS) as well as central nervous ...

INTRODUCTION

The 12 cranial nerves are olfactory nerve I, 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, spinal accessory nerve XI and hypoglossal nerve XII . Cranial nerves that transmit information from the brain to the eye are optic nerve, oculomotor nerve, trochlear nerve, trigeminal nerve, abducens nerve and facial nerve. The primary function of the cranial nerves in the eye is innervation of muscles in the eye, control of vision, controlling lateral and vertical movements of eyeball in the eye and ...

Cranial nerves refer to the nerves that emerge from the brain directly. This is in contrast to the spinal nerves that come from spinal cord segments. There are 12 pairs of cranial nerves in human and only the both the first and the second cranial nerve pairs originate from cerebrum. All the other pairs originate from the brainstem. Other than the cranial nerve II, all the other cranial pairs belong to the peripheral nervous system (PNS). The cranial nerve ganglia come from the central nervous system (CNS) (Patestas and Gartner).

The seventh pair of cranial nerves is the ...

The nervous system (speaker notes)

The NS is a network of neurons (specialized cells) that links different body parts to coordinate their activity. The system is divided into the Central nervous system (CNS) and the peripheral nervous system (PNS) which consist of the sensory and somatic nerves. The NS transmits messages between the body parts by electrical and chemical (neurotransmitters) signals. Generally sensory nerves transmit signals from sensory organs to the brain while motor nerves transmit signals from the brain to the muscles and the glands (effectors) (Guytona & Hall, 2006).

The CNS consists of the brain and the spinal cord. While the brain receives signals ...