Thyroid & Larynx Anatomy
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Thyroglossal Duct Cysts:
What are they? How do you distinguish if it's a cyst or the thyroid?
- Remnants of the gland in the duct
- Deglutition Test or Protrusion of tongue moves the cyst
- Tx: Sistrunk's operation cyst excision careful w/hypoglossal n.
Near Total Thyroidectomy?
Near Total Thyroidectomy:
post. part of each lobe preserved to protect recurrent
& sup. laryngeal n.
& spare PT
cut into thyroid to access larynx or biopsy
Complications of Thyroidectomy
- injury to recurrent laryngeal nervesinadverten removal of PT glands - tetany
vocal cords = vocal ligament + vocalis m.
Rima vestibuli vs. Rima glottitis
- Rima vestibuli: space between TRUE vocal cords
- Rima glottitis: space between FALSE vocal cords
Nerves, Arteries & Veins of the Larynx
- Sup. laryngeal A & V w/Internal laryngeal N - internal surface of larynx
- Inf. laryngeal A & V w/Recurrent laryngeal N - mucous membrane & inf. muscles
- Cricothyroid A.
- Sup. Laryngeal V --> Sup. thyroid V --> IJV
- Inf. Laryngeal V --> Inf thyroid V --> L brachiocephalic V.
Innervation of Laryngeal muscles
All intrinsic muscles Recurrent Laryngeal N. EXCEPT cricothyroid muscle External Laryngeal N.
Recurrent Laryngeal Nerve
- Function:ALL intrinsic m. EXCEPT cricothyroid
- Lesion:respiratory obstruction
- loss of sensation BELOW vocal cord
Internal Laryngeal Nerve
- Function:mucous membrane ABOVE vocal cords
- taste buds on epiglottis
- Lesion:loss of sensation ABOVE vocal cords
- loss of taste on epiglottis
External Laryngeal Nerve
- inf. pharyngeal constrictor
- Lesion:fatigued voice
- weak hoarseness
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