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ANTERIOR TRIANGLE OF THE NECK II

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ANTERIOR TRIANGLE OF THE NECK II. Dr. Ahmed Fathalla Ibrahim. CAROTID TRIANGLE. BOUNDARIES: Superiorly: posterior belly of digastric Inferiorly: superior belly of omohyoid Posteriorly: sternomastoid FLOOR: Anteriorly: hyoglossus & thyrohoid muscles

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ANTERIOR TRIANGLE OF THE NECK II

Dr. Ahmed Fathalla Ibrahim

carotid triangle
CAROTID TRIANGLE

BOUNDARIES:

  • Superiorly: posterior belly of digastric
  • Inferiorly: superior belly of omohyoid
  • Posteriorly: sternomastoid

FLOOR:

  • Anteriorly: hyoglossus & thyrohoid muscles
  • Posteriorly: middle & inferior constrictors of pharynx

C

contents of carotid triangle
CONTENTS OF CAROTID TRIANGLE

CAROTID SHEATH:

  • A condensation of deep fascia that contains:
  • Common & internal carotid arteries: (medially)
  • Internal jugular vein: (laterally)
  • Vagus nerve: between & a little posterior to arteries & vein
contents of carotid triangle1
CONTENTS OF CAROTID TRIANGLE
  • ARTERIES:
  • Termination of common carotid: at level of disc between C3 & C4 (level of upper border of thyroid cartilage)
  • Proximal part of external carotid
  • Proximal part of internal carotid
  • Five branches of external carotid: superior thyroid, ascending pharyngeal, lingual, facial & occipital
contents of carotid triangle2
CONTENTS OF CAROTID TRIANGLE
  • VEINS:
  • Internal jugular vein
  • Five tributaries to internal jugular veins: common facial, lingual, superior thyroid, middle thyroid, pharyngeal veins
contents of carotid triangle3
CONTENTS OF CAROTID TRIANGLE

FIVE NERVES:

  • TWO NERVES RELATED TO CAROTID SHEATH:
  • Ansa cervicalis (anterior rami of C1,2,3): embedded in the anterior wall of sheath
  • Sympathetic trunk: embedded in the posterior wall of sheath
contents of carotid triangle4
CONTENTS OF CAROTID TRIANGLE
  • THREE NERVES BETWEEN INTERNAL JUGULAR VEIN & INTERNAL CAROTID ARTERY:
  • Vagus (10th cranial) nerve: descends between internal jugular vein & common carotid artery
  • Spinal part of accessory (11th cranial) nerve: crosses internal jugular vein, passes deep to sternomastoid to reach posterior triangle
  • Hypoglossal (12th cranial) nerve: crosses internal & external carotid arteries, passes deep to posterior belly of digastric to reach digastric triangle
contents of carotid triangle5
CONTENTS OF CAROTID TRIANGLE
  • DEEP CERVICAL LYMPH NODES: embedded in the anterior wall of sheath, along the internal jugular vein
muscular triangle
MUSCULAR TRIANGLE

BOUNDARIES:

  • Anteriorly: midline of neck
  • Superiorly: superior belly of omohyoid
  • Inferiorly: sternomastoid

M

muscular triangle1
MUSCULAR TRIANGLE

CONTENTS:

THE INFRAHYOID MUSCLES

  • Superficial layer:
  • Sternohyoid: medially
  • Omohyoid: laterally
  • Deep layer:
  • Thyrohyoid: above
  • Sternothyroid: below
muscular triangle4
MUSCULAR TRIANGLE

FLOOR:

  • PRETRACHEAL FASCIA
  • STRUCTURES IN THE INFRAHYOID PART OF MEDIAN REGION OF FRONT OF NECK:
  • Thyrohyoid membrane
  • Thyroid cartilage
  • Cricothyroid ligament & muscle
  • Cricoid cartilage
  • Cricotracheal ligament
  • Trachea
  • Structures in front of trachea: jugular arch, inferior thyroid vein, isthmus of thyroid gland
infrahyoid muscles superficial layer
INFRAHYOID MUSCLES(SUPERFICIAL LAYER)

Sternohyoid:

  • Origin: back of manubrium sterni
  • Insertion: hyoid bone
  • Action: depression of hyoid bone

Omohyoid:

  • Superior belly:hyoid bone
  • Inferior belly:upper border of scapula
  • Insertion: intermediate tendon (deep to sternomastoid) attached to clavicle
  • Action: depression of hyoid bone
infrahyoid muscles deep layer
INFRAHYOID MUSCLES(DEEP LAYER)

Thyrohyoid:

  • Origin: oblique line of thryroid cartilage
  • Insertion: hyoid bone
  • Action: depression of hyoid bone, elevation of larynx

Sternothyroid:

  • Origin: back of manubrium sterni
  • Insertion: oblique line of thryroid cartilage
  • Action: depression of larynx
infrahyoid muscles
INFRAHYOID MUSCLES

NERVE SUPPLY:

  • All muscles are supplied by ansa cervicalis (anterior rami of C1,2,3) EXCEPT:thyrohyoid (by anterior ramus of C1)
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