Anatomy of the Neck: Anterior Triangle Part 1

Questions and Answers

What is the boundary of the Muscular or Thyroid Triangle in front?

Median line of the neck (correct)

Posterior border of the sternomastoid muscle

Anterior border of the sternomastoid muscle

Lower part of the anterior border of the sternomastoid muscle

Which muscle is located in the superficial layer of the infrahyoid muscles?

Sternohyoid muscle (correct)

Sternothyroid muscle

Thyrohyoid muscle

Omohyoid muscle

What is the name of the muscle that attaches to the hyoid bone and the thyroid cartilage?

Sternohyoid muscle

Sternothyroid muscle

Omohyoid muscle

Thyrohyoid muscle (correct)

What is the name of the triangular region bounded by the omohyoid muscle and the sternomastoid muscle?

Thyroid Triangle Signup and view all the answers

Which of the following muscles is NOT part of the infrahyoid muscles?

Scalene muscle Signup and view all the answers

What is the deep layer of the infrahyoid muscles composed of?

Sternothyroid and thyrohyoid muscles Signup and view all the answers

What is the location of the Ansa Cervicalis in relation to the carotid sheath?

Front of the carotid sheath Signup and view all the answers

Which of the following is a common characteristic of the infrahyoid muscles?

They are ribbon-like muscles Signup and view all the answers

What is the boundary above the Digastric Triangle?

The lower border of the mandible Signup and view all the answers

What is the name of the nerve that branches from the mandibular nerve in the Submental Triangle?

Mylohyoid nerve Signup and view all the answers

Which of the following structures is NOT part of the floor of the Submental Triangle?

Geniohyoid muscles Signup and view all the answers

What is the boundary of the Submental Triangle below?

The body of the hyoid bone Signup and view all the answers

Which of the following vessels is found in the Digastric Triangle?

Facial artery Signup and view all the answers

What is the name of the gland that is partly found in the Digastric Triangle?

Parotid gland Signup and view all the answers

What is the apex of the Submental Triangle?

The symphysis menti Signup and view all the answers

How many divisions of the Anterior Triangle of the neck are there?

4 Signup and view all the answers

Which nerve lies on the hyoglossus and then disappears under the mylohyoid muscle?

Hypoglossal nerve Signup and view all the answers

Which artery is superficial to the mylohyoid muscle?

Submental artery Signup and view all the answers

Which vessel is superficial to the submandibular gland?

Facial vein Signup and view all the answers

Which of the following nerves is responsible for the motor supply of the mylohyoid muscle?

Nerve to mylohyoid Signup and view all the answers

Which of the following is a content of the carotid triangle?

Lingual artery Signup and view all the answers

Which of the following vessels is NOT a content of the carotid triangle?

Posterior auricular artery Signup and view all the answers

Which nerve is responsible for the motor supply of the tongue?

Hypoglossal nerve Signup and view all the answers

Which of the following vessels is superficial to the mylohyoid muscle?

Mylohyoid artery Signup and view all the answers

Which of the following nerves is NOT located inside the carotid sheath?

Posterior auricular nerve Signup and view all the answers

What is the boundary of the carotid sheath in front and below?

Superior belly of omohyoid muscle Signup and view all the answers

How many branches does the external carotid artery give?

8 Signup and view all the answers

Which of the following vessels is NOT located inside the carotid sheath?

Posterior auricular artery Signup and view all the answers

What is the floor of the anterior part of the carotid sheath?

Hyoglossus and thyrohyoid muscles Signup and view all the answers

Which of the following nerves is located behind the carotid sheath?

Cervical sympathetic chain Signup and view all the answers

What is the boundary of the carotid sheath behind?

Sternomastoid muscle Signup and view all the answers

Which of the following is NOT a tributary of the internal jugular vein?

Posterior auricular vein Signup and view all the answers

Study Notes

The Anterior Triangle of the Neck

The anterior triangle is divided into four sub-triangles: submental, digastric, carotid, and muscular triangles.

Roof of the Anterior Triangle

The roof of the anterior triangle is formed by skin, superficial fascia, and the platysma muscle.

The Submental Triangle

The submental triangle is bounded by the symphysis menti (apex), the body of the hyoid bone (base), and the anterior belly of the digastric muscle (on each side).
The floor of the submental triangle is formed by the mylohyoid muscles and their median raphe.
Contents of the submental triangle include submental lymph nodes, submental vessels, and the mylohyoid nerve.

The Digastric Triangle

The digastric triangle is bounded by the lower border of the mandible (above), the anterior belly of the digastric muscle (in front), and the posterior belly of the digastric muscle (behind).
The floor of the digastric triangle is formed by the mylohyoid muscle (anteriorly) and the hyoglossus muscle (posteriorly).
Contents of the digastric triangle include:
- Glands: submandibular gland, part of the parotid gland, and submandibular lymph nodes.
- Vessels: facial artery, facial vein, submental artery, and mylohyoid vessels.
- Nerves: hypoglossal nerve and nerve to mylohyoid.

The Carotid Triangle

The carotid triangle is bounded by the hyoglossus and thyrohyoid muscles (posteriorly), the middle and inferior constrictor muscles of the pharynx (posteriorly), and the longus capitis muscle (posteriorly).
Contents of the carotid triangle include:
- Arteries: internal carotid artery, external carotid artery, and ascending pharyngeal artery.
- Nerves: glossopharyngeal nerve, vagus nerve, spinal accessory nerve, and hypoglossal nerve.
- Veins: internal jugular vein, common facial vein, lingual vein, and superior thyroid vein.
- Lymph nodes: deep cervical lymph nodes.

The Muscular or Thyroid Triangle

The muscular triangle is bounded by the median line of the neck (in front), the superior belly of the omohyoid muscle (postero-superiorly), and the sternomastoid muscle (behind and below).
Contents of the muscular triangle include the infrahyoid muscles, which are arranged in two layers: a superficial layer and a deep layer.

Infrahyoid Muscles

The infrahyoid muscles are ribbon-like and arranged in two layers:
- Superficial layer: sternohyoid muscle, superior belly of omohyoid muscle, and sternothyroid muscle.
- Deep layer: sternothyroid muscle, thyrohyoid muscle, and omohyoid muscle.

The Ansa Cervicalis

The ansa cervicalis is a nerve that lies in the carotid triangle and is part of the cervical sympathetic chain.

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Description

This quiz covers the anatomy of the neck, specifically the anterior triangle, including its divisions and structures in the midline of the neck. It's designed for students of anatomy and embryology.