THINGS TO WATCH OUT FOR: EXCEPTIONS, COMPARISONS, ETC :- Buccal Nerve vs. Buccal Branch of Facial Nerve Buccal Nerve comes off V3; Buccal Branch comes off Facial N. Buccal Nerve is Sensory; Buccal Branch of Facial is Motor. Three Muscles on Styloid Process: Stylopharyngeus – innervated by Glossopharyngeal N. Stylohyoid – innervated by Facial N. (remember stylohyoid is associated with Posterior Belly of Digastric M., which is also innervated by Facial N.) Styloglossus – innervated by Hypoglossal N. Superior Laryngeal Nerve: Internal vs. ExternalBranches Internal Branch = sensory External Branch = Motor (innervates Cricothyroid) Cricothyroid vs. The Rest of Larynx Innervations: Cricothyroid = innervated by External Branch of Superior Laryngeal Nerve. All other Laryngeal Muscles = innervated by Recurrent Laryngeal Nerve. Posterior vs. Anterior Belly of Digastric Posterior Belly = innervated by facial Anterior Belly = innervated by V3 (Nerve to Mylohyoid, to be exact – remember Anterior Belly is associated with Mylohyoid) Left vs. Right Recurrent Laryngeal Nerve Left = branches off Vagus, then loops around arch of aorta Right = branches off Vagus, then loops around Right Subclavian Artery Internal vs. External Jugular Veins: Internal = runs deep to Sternocleidomastoid External = runs superficial to Sternocleidomastoid Internal Jugular V and Internal Carotid A. vs. External Jugular V and External Carotid A Internal = goes straight up into brain External = goes outside of brain. Stapedius vs. Tensor Tympani : Facial N. → Stapedius → pulls on Stapes → dampens sounds (from voices) V3 → Tensor Tympani → pulls on malleus (which then pulls on tympanic membrane) → dampens sounds (from chewing). Components of Carotid Sheath : Internal Jugular Vein Common Carotid Artery Vagus Nerve runs between them. Genioglossus vs. Geniohyoid vs. MylohyoidInnervations: Genioglossus = innervated by Hypoglossal N. (XII) Geniohyoid = innervated by C1 Mylohyoid = innervated by V3 (Nerve to Mylohyoid) Cranial Nerves that have Parasympathetic Innervation: CN 3, 7, 9, 10 What does the Superior Oblique muscle do? Its action is to make your eye look down and out To test to see if the Superior Oblique works, look in and down (note: NOT down and in) . Because the “out” action can also be done by lateral rectus, you can’t reliably test for Superior Oblique’s “out” function, and therefore you only test for the Superior Oblique’s “down” function. Because inferior rectus also does the “down” action, you tell the patient to look “in” first before looking “down” because inferior rectus doesn’t work well when the eye is adducted. Innervation of the Tongue: Anterior 2/3 General Sensation Lingual N. (from V3 Taste Sensation Chorda Tympani (fr Motor Hypoglossal N. Larynx Muscles: Only Abductor — Posterior Cricoarytenoid. Whispering Muscle (doesn’t adduct all the way) — Transverse Arytenoid M. Lowers pitch — Thyroarytenoid M. Raises pitch — Cricothyroid M. All “-glossus” muscles are innervated by hypoglossus except palatoglossus, which is innervated by vagus. All the pharynx muscles are vagus except stylopharyngeus, which is innervated by glossopharyngeus. :)
Posted on: Mon, 18 Aug 2014 08:00:26 +0000
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