Neural - Cranial Nerve Development: Difference between revisions
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'''Cranial Nerve Development:''' [[Neural_Exam_-_3_month_cranial_nerves|3 months]] | [[Neural Exam - 12 month Cranial Nerves|12 months]] | '''Cranial Nerve Development:''' [[Neural_Exam_-_3_month_cranial_nerves|3 months]] | [[Neural Exam - 12 month Cranial Nerves|12 months]] | [[Neural Exam - 18 Cranial Nerves|18 months]] | ||
Revision as of 08:33, 16 February 2016
Embryology - 16 Jun 2024 Expand to Translate |
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Introduction
Neural development is one of the earliest systems to begin and the last to be completed after birth. This development generates the most complex structure within the embryo and the long time period of development means in utero insult during pregnancy may have consequences to development of the nervous system.
Differences between birds and mammals:
- both - have retinal axons projecting topographically to targets in the brain.
- birds - the visual fibers from the entire retina decussate at the optic chiasm.
- mammals - some axons from the temporal retina diverge at the midline to project ipsilaterally.
Neural development beginnings quite early, therefore also look at notes covering Week 3- neural tube and Week 4-early nervous system. Development of the neural crest and sensory systems (hearing/vision/smell) are only introduced in these notes and are covered in other notes sections.
Cranial Nerves | |
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CN I | Olfactory |
CN II | Optic |
CN III | Oculomotor |
CN IV | Trochlear |
CN V | Trigeminal |
CN VI | Abducent |
CN VII | Facial |
CN VIII | Acoustic |
CN IX | Glossopharyngeal |
CN X | Vagus |
CN XI | Accessory |
CN XII | Hypoglossal |
Cranial Nerves | ||||
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Nerve Number | Name | Type | Origin | Function |
CN I | Olfactory | sensory | telencephalon | smell placode |
CN II | Optic | sensory | retinal ganglial cells | vision |
CN III | Oculomotor | motor | anterior midbrain | extraocular muscles eye movements and pupil dilation (motor) |
CN IV | Trochlear | motor | dorsal midbrain | extraocular muscles (superior oblique muscle) |
CN V | Trigeminal | motor/sensory | pons | touch, mastication |
CN VI | Abducent | motor | extraocular muscles | control eye movements (lateral rectus muscle) |
CN VII | Facial | motor/sensory | pons | facial expression, taste (tongue anterior and central regions) regulate salivary production. |
CN VIII | Acoustic | sensory | vestibular and cochlear nuclei | hearing, placode |
CN IX | Glossopharyngeal | motor/sensory | medulla | swallowing and speech, taste (tongue posterior region) |
CN X | Vagus | motor/sensory | medulla | larynx and pharynx muscles (speech and swallowing), regulates heartbeat, sweating, and peristalsis |
CN XI | Accessory | motor | motor neurons | sternocleidomastoid and trapezius muscles |
CN XII | Hypoglossal | motor | motor neurons | tongue muscles (speech, eating and other oral functions) |
Cranial Nerve Links: Neural | Neural Crest | CN I | CN II | CN III| CN IV | CN V | CN VI | CN VII | CN VIII | CN IX | CN X | CN XI | CN XII | placodes | Category:Cranial Nerve |
Some Recent Findings
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More recent papers |
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This table allows an automated computer search of the external PubMed database using the listed "Search term" text link.
More? References | Discussion Page | Journal Searches | 2019 References | 2020 References Search term: Cranial Nerve Development <pubmed limit=5>Cranial Nerve Development</pubmed> |
Development Overview
Neuralation begins at the trilaminar embryo with formation of the notochord and somites, both of which underly the ectoderm and do not contribute to the nervous system, but are involved with patterning its initial formation. The central portion of the ectoderm then forms the neural plate that folds to form the neural tube, that will eventually form the entire central nervous system.
- Early developmental sequence: Epiblast - Ectoderm - Neural Plate - Neural groove and Neural Crest - Neural Tube and Neural Crest
Neural Tube | Primary Vesicles | Secondary Vesicles | Adult Structures |
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week 3 | week 4 | week 5 | adult |
prosencephalon (forebrain) | telencephalon | Rhinencephalon, Amygdala, hippocampus, cerebrum (cortex), hypothalamus, pituitary | Basal Ganglia, lateral ventricles | |
diencephalon | epithalamus, thalamus, Subthalamus, pineal, posterior commissure, pretectum, third ventricle | ||
mesencephalon (midbrain) | mesencephalon | tectum, Cerebral peduncle, cerebral aqueduct, pons | |
rhombencephalon (hindbrain) | metencephalon | cerebellum | |
myelencephalon | medulla oblongata, isthmus | ||
spinal cord, pyramidal decussation, central canal |
Motor and Sensory
Cranial motor nerves brainstem nuclei of origin | Primary Terminal Nuclei of the Afferent (sensory) Cranial Nerves |
Cranial Nerve VII
(N. Facialis; Seventh Nerve; CN VII)
The facial nerve (Figs. 788, 790) consists of a motor and a sensory part, the latter being frequently described under the name of the nervus intermedius (pars intermedii of Wrisberg) (Fig. 788). The two parts emerge at the lower border of the pons in the recess between the olive and the inferior peduncle, the motor part being the more medial, immediately to the lateral side of the sensory part is the acoustic nerve.
Gray Fig. 788. Plan of the Facial and Intermediate Nerves and their Communication with Other Nerves
Neonatal - Clinical
Examination of the baby’s cranial nerve function is often accomplished by observing spontaneous activity.
Newborn - Cranial Nerves | |||||||
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Normal | Abnormal |
Cranial Nerve Development: 3 months | 12 months | 18 months
- Links: Neural Exam Movies
Additional Images
Historic Images
Historic Disclaimer - information about historic embryology pages |
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Pages where the terms "Historic" (textbooks, papers, people, recommendations) appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms, interpretations and recommendations may not reflect our current scientific understanding. (More? Embryology History | Historic Embryology Papers) |
References
- ↑ <pubmed>20558153</pubmed>
Reviews
<pubmed>19206138</pubmed> <pubmed>11882306</pubmed>
Articles
<pubmed>18230116</pubmed>
Search PubMed
Search Pubmed: Tectum Embryology | Tectum Development
Glossary Links
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Cite this page: Hill, M.A. (2024, June 16) Embryology Neural - Cranial Nerve Development. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Neural_-_Cranial_Nerve_Development
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G