Cranial Nerves Anatomy

The cranial nerves are a set of 12 paired nerves that arise directly from the brain. The facial nerve is the seventh paired cranial nerve.

Anatomy Nazeen Batch Cranial Nerves

In this article we shall look at the anatomical course of the nerve and the motor sensory and parasympathetic functions of its terminal branches.

Cranial nerves anatomy. Optic nerve ii the optic nerve is part of the special senses cranial nerves and represents. The cranial nerves are the 12 paired sets of nerves that arise from the cerebrum or brainstem and leave the central nervous system through cranial foramina rather than through the spine. Cranial nerve anatomy by greg mclauchlin i olfactory nerve the olfactory nerve is unique but not in ways that make it particularly interesting.

This mri cranial nerves axial cross sectional anatomy tool is absolutely free to use. Cranial nerves are the 12 nerves of the peripheral nervous system that innervate the structures of the head and neck. Vagus nerve cn x is the only cranial nerve that innervates the structures beyond the head and neck region.

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. The brainstem can be divided into three levels the midbrain the pons and the medulla. Use the mouse scroll wheel to move the images up and down alternatively use the tiny arrows on both side of the image to move the images.

The names of the cranial nerves relate to their function and are numerically identified in roman numerals i xii. Examination of the cranial nerves allows one to view the brainstem all the way from its rostral to caudal extent. The cranial nerves are numbered one to twelve always using the roman numerals i to xii.

The first two olfactory and optic arise from the cerebrum whereas the remaining ten emerge from the brain stem. Key points the vagus nerve cranial nerve x sends information about the bodys organs to the brain. The facial nerve is associated with the derivatives of the second pharyngeal arch.

The vagus nerve has axons that originate from or enter the dorsal nucleus of the vagus nerve. The vagus nerve is responsible for heart rate gastrointestinal peristalsis and sweating to name. Cranial nerves olfactory nerve i olfaction is part of the special senses cranial nerve group and represents.

Ten of the cranial nerves originate in the brainstem. The sensory neurons in the olfactory epithelium are outside the meninges and below the cribriform plate. Cranial nerves relay information between the brain and parts of the body primarily to and from regions of the head and neck.

The course of the facial nerve is very complex. Oculomotor nerve iii the oculomotor nerve is part of the group of cranial nerves.

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