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Questions and Answers
What is the posterior boundary of the Carotid triangle?
Which of the following nerves is NOT found in the Carotid triangle?
What is the floor of the Submental triangle formed by?
Which of the following is NOT a content of the Muscular triangle?
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What is the anterior boundary of the Muscular triangle?
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Which of the following arteries is NOT found in the Carotid triangle?
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What is the function of the cervical branch of the facial nerve in the superficial fascia?
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Which triangle is bounded by the anterior median line of the neck and the anterior border of the sternomastoid muscle?
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What is the function of the prevertebral fascia in the deep cervical fascia?
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Which triangle is bounded by the posterior border of the sternomastoid muscle, the anterior border of the trapezius muscle, and the clavicle?
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What is the main component of the carotid triangle?
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Which fascia layer splits to enclose the sternomastoid and trapezius muscles?
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What is the function of the submandibular triangle?
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Which triangle is bounded by the anterior border of the sternomastoid muscle, the posterior border of the dignastric muscle, and the hyoid bone?
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What forms the posterior boundary of the anterior triangle of the neck?
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What is the roof of the anterior triangle of the neck composed of?
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How many triangles is the anterior triangle of the neck subdivided into?
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What is the apex of the submental triangle bounded by?
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What is the floor of the submandibular triangle composed of?
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What is the contents of the submental triangle?
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What is the boundary of the carotid triangle?
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What muscle forms the floor of the anterior triangle of the neck?
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Study Notes
Anatomy of the Neck
- The neck is divided into two triangles: anterior triangle and posterior triangle.
- The anterior triangle is bounded by the midline of the neck, the anterior border of the sternomastoid muscle, and the lower border of the mandible.
Layers of the Neck
- The neck has five layers:
- Skin
- Superficial fascia
- Deep cervical fascia
- Muscle layers
- Viscera or tubes
Superficial Fascia
- Contains the platysma muscle
- Contains the cervical branch of the facial nerve
- Contains the external jugular vein
- Contains the anterior jugular veins
- Contains cutaneous branches of the cervical plexus
Deep Cervical Fascia
- Has four layers:
- Investing fascia (superficial layer)
- Pretracheal fascia (middle layer)
- Prevertebral fascia (deep layer)
- Carotid sheath
Investing Fascia
- Encircles the neck completely
- Splits to enclose the sternomastoid and trapezius muscles
- Above the hyoid bone, it splits to enclose the submandibular salivary gland
- Below the hyoid bone, it covers the infrahyoid muscles and then splits to enclose the suprasternal space
Triangles of the Neck
- The anterior triangle is subdivided into four smaller triangles:
- Submental triangle
- Submandibular (digastric) triangle
- Carotid triangle
- Muscular triangle
Submental Triangle
- Boundaries:
- Apex: symphysis menti
- Base: the body of the hyoid bone
- Each side: the anterior belly of the digastric muscle
- Floor: the mylohyoid muscle
- Contents:
- Submental artery
- Submental vein and the beginning of the anterior jugular vein
- Mylohyoid nerve
- Submental lymph nodes
Submandibular (Digastric) Triangle
- Boundaries:
- Above: the lower border of the mandible
- Anteriorly: the anterior belly of the digastric muscle
- Posteriorly: the posterior belly of the digastric muscle
- Floor: the mylohyoid, the hyoglossus, and the middle constrictor
- Contents:
- Facial artery
- Anterior facial vein
Carotid Triangle
- Boundaries:
- In front and above: the posterior belly of the digastric muscle
- In front and below: the superior belly of the omohyoid
- Behind: the anterior border of the sternomastoid muscle
- Floor: thyrohyoid and hyoglossus (anteriorly), and the middle and inferior constrictors (posteriorly)
- Contents:
- Common carotid artery
- Internal carotid artery
- External carotid artery and its five branches
- Internal jugular vein
- Common facial vein
- Last four cranial nerves (9, 10, 11, 12)
- Ansa cervicalis
- Deep cervical lymph nodes along the internal jugular vein
Muscular Triangle
- Boundaries:
- In front: the midline of the neck (from the hyoid bone to the sternum)
- Behind and above: the superior belly of the omohyoid
- Behind and below: the sternomastoid muscle
- Contents:
- Infrahyoid muscles
- Cricothyroid muscle (tensor of the vocal cords)
- Thyroid gland
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Description
Learn about the boundaries and anatomical structures of the Carotid triangle, including muscles and glands.
