Cranial Nerves Anatomy
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You Ve Got Some More Nerve S The Cranial Nerves
Ten of the cranial nerves originate in the brainstem.
Cranial nerves anatomy. The cranial nerves are numbered one to twelve always using the roman numerals i to xii. The vagus nerve is responsible for heart rate gastrointestinal peristalsis and sweating to name. The facial nerve is associated with the derivatives of the second pharyngeal arch.
The facial nerve is the seventh paired cranial nerve. Cranial nerves olfactory nerve i olfaction is part of the special senses cranial nerve group and represents. Cranial nerves are the 12 nerves of the peripheral nervous system that innervate the structures of the head and neck.
Examination of the cranial nerves allows one to view the brainstem all the way from its rostral to caudal extent. In this article we shall look at the anatomical course of the nerve and the motor sensory and parasympathetic functions of its terminal branches. The vagus nerve has axons that originate from or enter the dorsal nucleus of the vagus nerve.
The cranial nerves are a set of 12 paired nerves that arise directly from the brain. Optic nerve ii the optic nerve is part of the special senses cranial nerves and represents. Oculomotor nerve iii the oculomotor nerve is part of the group of cranial nerves.
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. The course of the facial nerve is very complex. The first two olfactory and optic arise from the cerebrum whereas the remaining ten emerge from the brain stem.
The names of the cranial nerves relate to their function and are numerically identified in roman numerals i xii. The sensory neurons in the olfactory epithelium are outside the meninges and below the cribriform plate. The brainstem can be divided into three levels the midbrain the pons and the medulla.
Cranial nerves relay information between the brain and parts of the body primarily to and from regions of the head and neck. Key points the vagus nerve cranial nerve x sends information about the bodys organs to the brain. 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. Cranial nerve anatomy by greg mclauchlin i olfactory nerve the olfactory nerve is unique but not in ways that make it particularly interesting.
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