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CN I
- Olfactory nerve
- SS olfaction(smell)
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CN III
- Oculomotor nerve
- SE, SA, and VE – para/pre
- eyeball muscles
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CN IV
- Trochlear nerve
- SA, SE
- one eye muscle
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CN V
- Trigeminal nerve
- V1 & V2 are purely sensory.
- V3 is both sensory and motor (the branchial motor fibers go to muscles of mastication – which develop from branchial arch 1).
- SA & branchial motor (SVE) fibers.
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CN VI
- Abducens
- SA SE
- innervates one muscle (lateral rectus m.) in the orbit which “abducts” the eyeball (hence the name “abducens”)
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CN VII
- Facial
- SA, brachial motor fibers, VA, VE – para/pre, and SS (anterior 2/3 tounge taste) fibers.
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CN VIII
- Vestibulo-cochlear
- SS fibers(hearing and balance)
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CN IX
- Glossopharyngeal
- branchial motor fibers, VA, VE – para/pre, and SS (taste) fibers
- innervates a single pharyneal muscle (stylopharyngeus – which develops from branchial arch 3),
- supplies taste fibers to the posterior 1/3rd of the tongue, and
- visceral afferent fibers to middle ear cavity, oropharynx, & tongue.
- It is part of the cranial outflow of the parasympathetic division.
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CN X
- Vagus nerve
- branchial motor (XI via X) fibers, VA, VE –para/pre, SS (taste), and SA fibers
- branchial innervate muscles of the pharynx and larynx.
- some taste fibers to the epiglottis and taste bud and some somatic afferent fibers from the area of the external auditory meatus.
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CN XI
- Accessory nerve
- SA and SE fibers, branchial
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CN XII
- Hypoglossal nerve
- SA, SE
- motor nerve that innervates the intrinsic and extrinsic muscles of the tongue.
- SA fibers (proprioceptive) carried by the hypoglossal nerve to the tongue may have their cell bodies in the C1-2 DRGs.
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CN I
- Olfactory Nerve
- SS (smell)
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CN III
- Oculomotor Nerve
- SA, SE, VA, VE-para/pre
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CN V
- Trigeminal Nerve
- SA (V1 & V2 Divisions)
- SA & BM (V3 Division)
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CN VII
- Facial Nerve
- SS (taste), SA, BM, VA, VE-para/pre
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CN VIII
- Vestibulocochlear Nerve
- SS (hearing & balance)
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CN IX
- Glossopharyngeal Nerve
- SS (taste), (SA), BM, VA, VE-para/pre
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CN X
- Vagus Nerve
- SS (taste), SA, BM, VA, VE-para/pre
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CN XI
- Cranial Part (CN XI via X) BM
- Spinal Accessory Part SA, SE
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Anterior Triangle Borders
- the midline
- mandible (inferior margin)
- sternocleidomastoid (SCM)
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muscular triangle Borders
- the midline,
- the hyoid bone,
- the omohyoid (superior belly)
- the SCM (inferior half).
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muscular triangle contents
- omohyoid m.
- sternohyoid m.
- sternothryoid m.
- thyrohyoid m.
- anterior jugular vein *
- thyroid gland (and parathyroid glands*)
- recurrent laryngeal ns. *
- larynx (covered in another lecture)
- trachea (covered in another lecture)
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carotid triangle boundaries
- SCM,
- hyoid bone,
- omohyoid (superior belly), and
- digastric ( posterior belly)
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carotid triangle contains:
- carotid sheath structures
- hypoglossal nerve (CN XII)
- accessory nerve (CN XI)
- ansa cervicalis
- external carotid artery branches
- the superior laryngeal nerve and its branches
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submandibular triangle borders:
- mandible (inferior margin),
- anterior belly of the digastric m.
- posterior belly of the digastric m.
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submandibular contents:
- submandibular gland,
- facial artery & vein,
- hypoglossal nerve (CN XII),
- submandibular lymph nodes.
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External Carotid Branches
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Facial Nerve Motor Branches
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