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Lecture

Notes on Cranial Nerves

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Department
Biology
Course
BIOL 1300
Professor
All Professors
Semester
Fall

Description
Dan Kirshenbaum BUSM Class of 2011 - Gross Anatomy 2007 Cranial Nerve I Name: Olfactory nerve Foramen: Cribiform plate Fiber Type: Special sensory Function: Olfactory bulbs, Smell Branches: Olfactory filaments Embryo: CNS (ectoderm) cribiform plate sensory = Dan Kirshenbaum BUSM Class of 2011 - Gross Anatomy 2007 Cranial Nerve II Name: Optic nerve Foramen: Optic canal Fiber Type: Special sensory Function: Retina, vision Branches: None Embryo: Diencephalon Other: Optic chiasm is in front of pituitary optic chiasm optic nerve optic tract sensory = Dan Kirshenbaum BUSM Class of 2011 - Gross Anatomy 2007 Cranial Nerve III Name: Oculomotor Foramen: Superior orbital fissure Fiber Type: General somatic motor, Parasympathetic Function: General somatic motor: 1. superior rectus 2. levator palpebrae superioris 3. medial rectus 4. inferior rectus 5. inferior oblique Parasympathetic 1. sphincter pupillae 2. ciliary muscle Branches: 1. superior branch 2. inferior branch Embryo: Mesencephalon to levator palpebrae superioris to superior rectus sup. orbital fissure sup. branch to medial rectus ciliary ganglion short ciliary inf. branch to inferior oblique to inferior rectus motor = Dan Kirshenbaum BUSM Class of 2011 - Gross Anatomy 2007 Cranial Nerve IV Name: Trochlear Foramen: Superior orbital fissure Fiber Type: General somatic motor Function: General somatic motor: 1. superior oblique Branches: muscular Embryo: Mesencephalon sup. orbital fissure to sup. oblique motor = Dan Kirshenbaum BUSM Class of 2011 - Gross Anatomy 2007 Cranial Nerve V Name: Trigeminal Foramen: V1: sup. orbital fissure V2: foramen rotundum V3: foramen ovale Fiber Type: General somatic motor, General somatic sensory Embryo Metencephalon Branches: V1 - ophthalmic 1. meningeal 2. frontal 3. lacrimal 4. nasociliary V2 - maxillary 1. meningeal 2. infraorbital 3. post/ant superior alveolar 4. zygomatic 5. sensory roots to pterygopalatine ganglion 6. greater/lesser Function: V2 - maxillary (sensory) palatine 1. meninges 2. maxillary air sinus V3 - mandibular 3. gums/teeth of upper jaw 1. meningeal 4. bony part of cheek 2. auriculotemporal V3 - mandibular (sensory) 3. buccal 4. lingual 1. meninges 5. inferior alveolar 2. mucosa of oral cavity/palate 3. ant. 2/3 of tongue (general) Function: V1 - ophthalmic (sensory) 4. gums/teeth of lower jaw 1. meninges 5. soft part of cheek/mandible 2. orbit (cornea conjuctiva) 3. nasal cavity lining V3 - mandibular (motor) 4. forehead 1. masseter 2. buccinator 5. middle nose 3. lateral pterygoid muscles of mastication 6. frontal air sinuses 4. medial pterygoid} 5. tensor tympani 6. tensor palatini 7. mylohyoid 8. ant. belly of digastric Dan Kirshenbaum BUSM Class of 2011 - Gross Anatomy 2007 Cranial Nerve V (cont...) supratrochlear supraorbital superficial temporal branches supraorbital foramen n ta l fro sup. orb. nasoc post/ant ethmoidal fissure ilary infratrochlear V1 lcil trig. gang. V2 foramen rotundum ciliary gang. m ax ilry V3 otic zygoma tic infraorbital gang. ifra foramen foramen ovale orb ial infraorbital to tensor to tensor tympani veli palatini pterygopalatine gang. greater superior alveolar branches palatine auriculotemporal lesser palatine inferior parotid cl branches alveolar rd a yim igal mandibular foramen mental submandibular gang. to mylohyoid to anterior belly of digastric motor to skeletal muscles = to mylohyoid parasymp. motor to cardiac and smooth muscle = sensory (afferent) = Dan Kirshenbaum BUSM Class of 2011 - Gross Anatomy 2007 Cranial Nerve VI Name: Abducens Foramen: Superior orbital fissure Fiber Type: General somatic motor Function: General somatic motor: 1. lateral rectus Branches: None Embryo: Metencephalon sup. orbital fissure to lateral rectus motor = Dan Kirshenbaum BUSM Class of 2011 - Gross Anatomy 2007 Cranial Nerve VII Name: Facial Foramen: Internal acoustic meatus Fiber Type: Special sensory General sensory Branchiomotor Parasympathetic motor Function: Branchiomotor: 1. muscles of facial expression 2. post. belly of digastric 3. stylohyoid Special sensory: 1. taste ant. 2/3 of the tongue General sensory: 1. skin of auricle 2. skin of small area behind ear Parasympathetic: 1. lacrimal gland 2. submandibular gland 3. sublinguial gland 4. mucous membranes of nasopharynx, hard and soft palate Branches: Branchiomotor: 1. temporal 2. zygomatic 3. buccal 4. mandibular 5. cervical 6. post. auricular 7. branch to post. belly of digastric 8. stylohyoid Embryo: Metencephalon Dan Kirshenbaum BUSM Class of 2011 - Gross Anatomy 2007 Cranial Nerve VII (cont...)
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