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MD2S3: Anatomy 203 > The Anterior Triangle of the Neck > Flashcards

The Anterior Triangle of the Neck Flashcards

1
Q

What forms the Roof of the Anterior and Posterior Triangles?

A

Superficial to Deep:
Skin
Superficial Fascia containing Platysma Muscle
Investing Cervical Fascia

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2
Q

Roof Structure: Platysma
Origin

A

Clavicle

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3
Q

Roof Structure: Platysma
Insertion

A

Lower Border of Mandible

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4
Q

Roof Structure: Platysma
Nerve Supply

A

Facial Nerve

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5
Q

Roof Structure: Platysma
Action

A

Depresses Mandible
Tenses skin of Lower Face

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6
Q

What are the boundaries of the Anterior Triangle?

A

Anterior: Middle Line of Neck
Posterior: Anterior border of Sternomastoid
Base (Superior): Lower border of Mandible and line extending to Mastoid Process
Apex (Inferior): Suprasternal Notch

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7
Q

How many Subdivisions are there of the Anterior Triangle?

A

3 1/2 Triangles

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8
Q

What are the names of the Subdivisions of the Anterior Triangle?

A

Muscular
Carotid
Digastric/Submandibular
0.5 Submental

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9
Q

Which muscles divide the Anterior Triangle?

A

Digastric
Omohyoid

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10
Q

Carotid Triangle
Boundaries

A

Posterior: Upper Part of Sternomastoid
Anteroinferior: Superior Belly of Omohyoid Muscle
Anterosuperior: Posterior Belly of Digastric Muscle and Stylohyoid Muscles

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11
Q

Carotid Triangle
Floor

A

Anterior Part: Hyoglossus (Above Hyoid Bone) and Thyrohyoid (Below Hyoid Bone)
Posterior Part: Middle Constrictor (Above Hyoid Bone) and Inferior Constrictor (Below Hyoid Bone)

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12
Q

Carotid Triangle
Contents: Vessels

A

Upper part of Common Carotid Artery
Internal Carotid Artery
External Carotid Artery with its 5 branches
Internal Jugular Vein (lateral to CCA or ICA)

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13
Q

Carotid Triangle
Branches of External Carotid

A

Superior Thyroid Artery
Ascending Pharyngeal Artery
Lingual Artery
Occipital Artery
Facial Artery

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14
Q

Carotid Triangle
Contents: Nerves

A

Hypoglossal Nerve
Vagus Nerve
Spinal Accessory Nerves
Ansa Cervicalis (C1, 2, 3)
Sympathetic Chain

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15
Q

Digastric Triangle
Boundaries

A

Anteroinferior: Anterior Belly of Digastric
Posteroinferior: Posterior Belly of Digastric + Styohyoid
Above: Base of Mandible and line from Mandibular Angle to Mastoid Process
Floor: Hypoglossus and partially by Mylohyoid Muscle

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16
Q

Digastric Triangle: Mylohyoid
Origin

A

Myelohyoid Line

17
Q

Digastric Triangle: Mylohyoid
Insertion

A

Hyoid Bone

18
Q

Digastric Triangle: Mylohyoid
Nerve Supply

A

Mandibular Nerve

19
Q

Digastric Triangle: Mylohyoid
Action

A

Elevation of Mouth Floor and Hyoid Bone during Swallowing and Speech

20
Q

Digastric Triangle: Digastric Muscle
Origin

A

Anterior Belly: Digastric Fossa
Posterior Belly: Digastric Notch

21
Q

Digastric Triangle: Digastric Muscle
Action

A

Opening of Mouth
Raising Hyoid

22
Q

Digastric Triangle: Digastric Muscle
Nerve Supply

A

Anterior Belly: Mandibular Nerve
Posterior Belly: Facial Nerve

23
Q

Digastric Triangle
Contents: Glands

A

Submandibular Gland
Parotid Gland

24
Q

Digastric Triangle
Contents: Vessels

A

Facial Artery
Facial Vein
External Carotid Artery

25
Q

Digastric Triangle
Contents: Nerves

A

Hypoglossal Nerve
Mylohyoid Nerve

26
Q

Submental Triangle
Boundaries

A

Base: Hyoid Bone
Apex: Chin
Either Side: Anterior Belly of Digastric
Floor: Mylohyoid Muscle

27
Q

Muscular Triangle
Boundaries

A

Anterior: Median line of the Neck from Hyoid Bone to Sternum
Posterosuperiorly: Superior Belly of the Omohyoid Muscle
Posteroinferiorly: Lower part of Sternomastoid

28
Q

Muscular Triangle
Contents

A

4 infra-hyoid/strap muscles

29
Q

Muscular Triangle
Layers of Contents

A

Superficial Layer: Sternohyoid and Omohyoid
Deep Layer: Sternothyroid and Thyroidhyoid

30
Q

Muscular Triangle
Thyrohyoid Function

A

During 2nd Stage of Deglutition, Thyrohyoid elevates Larynx to close Laryngeal Inlet

31
Q

Muscular Triangle
Infrahyroid Function

A

After 2nd Stage, Infrahyoid depresses Larynx and opens Laryngeal Inlet

32
Q

Muscular Triangle
Nerve Supply

A

All muscles supplied by Ansa Cervicalis
Only Thyrohyoid supplied by Nerve to Thyrohyoid (C1) from Hypoglossal Nerve

MD2S3: Anatomy 203 (31 decks)

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