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

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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

  • Posteriorly: middle & inferior constrictors of pharynx

C


CAROTID TRIANGLE


CAROTID TRIANGLE


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 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 TRIANGLE

  • VEINS:

  • Internal jugular vein

  • Five tributaries to internal jugular veins: common facial, lingual, superior thyroid, middle thyroid, pharyngeal veins


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 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 TRIANGLE

  • DEEP CERVICAL LYMPH NODES: embedded in the anterior wall of sheath, along the internal jugular vein


MUSCULAR TRIANGLE

BOUNDARIES:

  • Anteriorly: midline of neck

  • Superiorly: superior belly of omohyoid

  • Inferiorly: sternomastoid

M


MUSCULAR TRIANGLE

CONTENTS:

THE INFRAHYOID MUSCLES

  • Superficial layer:

  • Sternohyoid: medially

  • Omohyoid: laterally

  • Deep layer:

  • Thyrohyoid: above

  • Sternothyroid: below


MUSCULAR TRIANGLE


MUSCULAR TRIANGLE


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)

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)

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

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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