3 carotid triangle___9th_10th_cn

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3 carotid triangle___9th_10th_cn

  1. 1. Carotid TriangleBoundariesPost. Belly of digastric msup. Belly of omohyoidAnt. border of sternomastoid
  2. 2. Carotid TriangleContentsI. Carotid sheathis a column of fascia that surrounds the bloodvessels and nerves as they pass through the neck
  3. 3. I. Carotid sheathAttachment:• Sup.: Base of skull (Carotid and jugular foramina)• Inf.: Arch of aorta
  4. 4. I. Carotid sheathContents:• Above post. Belly of digastric: ICA, IJV & lower 4 CNs• Below post. Belly of digastric: CCA, IJV & vagus nerve
  5. 5. Carotid TriangleContentsII. 3 Carotid arteries: CCA,ICA & ECAIII. IJVIV. 10, 11 & 12 CNV. 3 small nerves: descendinghypoglossi & cervicalis & nerveto thyrohyoidVI. Cervical lymph nodesVII. Sympathetic chain
  6. 6. Common Carotid aOrigin:• Rt CCA: from innominate a• Lt CCA: from arch of aorta
  7. 7. Common Carotid aTermination: at C3-4 or at upper border of thyroid cartilage by dividing into 2terminal branches ICA & ECABranches: ICA and ECA
  8. 8. Internal Carotid aOrigin: at C3-4 or at upper border of thyroid cartilage from CCATermination: intracranially by dividing into anterior and middle cerebral a
  9. 9. Internal Carotid aDivide into parts : cervical, intrapetrous, intracavernous &intracranial• Termination of Cervical part: at carotid canal• Branches of cervical part : NO BRANCHES
  10. 10. External Carotid aOrigin: at C3-4 or at upper border of thyroidcartilage from CCATermination: in parotid g. by dividing intosuperficial temporal a & maxillary a
  11. 11. External Carotid a Branches: 6 3 ant 2 post 1 medial
  12. 12. Internal jugular veinBeginning: sigmoid venoussinusTermination: join subclavianV to form innominate V Has 2 dilatations (sup. & inf. Bulbs)Tributaries:1. Inf. Petrosal sinus2. Pharyngeal V3. Lingual V4. Common facial V5. Sup. Thyroidal V6. Middle thyroidal V
  13. 13. The Glossopharyngeal nervea.Functions: mixed (motor, sensory & parasympathetic)b.Deep origin: in the medulla oblongatac.Foramen: middle of the jugular foramene.Ganglia: •Superior ganglion: small and has no branches •Inferior ganglion: large give tympanic branch
  14. 14. The Glossopharyngeal nerveCourse : 9th CN •At the base of the skull the nerve lies between the internal jugular vein and the internal carotid artery deep to the styloid process and structures attached to it and the posterior belly of digastric •Then leave carotid sheath & passes forward with stylopharyngeus muscle Stylopharyngeus between the internal and external carotid arteries
  15. 15. The Glossopharyngeal nerveCourse :then curves forwards betweenthe superior and middleconstrictor muscles of pharynx toend by breaking into its terminalbranches
  16. 16. The Glossopharyngeal nerveBranches:Tympanic nerve: become thelesser petrosal nerve ……….oticganglion. supplies the parotidglandCarotid branch: to the carotidsinus and body,Pharyngeal branches: sensoryNerve to the stylopharyngeusTonsillar branches: sensory fromthe palate and the tonsilsLingual branches: carry generaland taste fibres from the posterior1/3 of the tongue
  17. 17. The Vagus nervea.Functions: mixed (motor, sensory & parasympathetic)b.Deep origin: in the medulla oblongatac.Foramen: middle of the jugular foramene.Ganglia: •Superior ganglion: small give 2 branches •Inferior ganglion: large give 2 branches. Cranial accessory root (XI) join it Cranial part of XI
  18. 18. Vagus nerve 10th CNCourse : At the base of the skull the nervelies between the internal jugularvein and the internal carotidartery deep to the styloid processand structures attached to it andthe posterior belly of digastric
  19. 19. Vagus nerveCourse :The nerve descends verticallywithin the carotid sheathbetween the common carotidartery and the internal jugularvein until it reaches the root ofthe neck, it crosses in front of thefirst part of the subclavian arteryto the thorax
  20. 20. Vagus nerveBranches:I. From sup. ganglionMeningeal nAuricular nII. From inf. ganglionPharyngeal n (motor)Superior laryngeal n (mixed)III. Cardiac branch (parasym.)IV. Recurrent laryngeal n (mixed)

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