Triangles Of The Neck

Question 1

Boundaries for Posterior Triangles

Answer 1

In front ~ Post. Border of SCM

Behind ~ Trapezius Muscle

Apex ~ Mastoid Process

Base ~ Clavicle Bone

Question 2

Posterior Triangles are Divided By

Answer 2

Inferior belly of omohyoid

Into Occipital

and

SupraClavicular/SubClavian Triangle

Question 3

Posterior Belly Of Digastric Closely accompanied by ___________ Muscle

Answer 3

StyloHyoid Muscle

Question 4

Anterior Triangles

Answer 4

1. Sub Mental Triangle
2. Digastric Triangle
3. Carotid Triangle
4. Muscular Triangle

Question 5

Floor of Posterior Triangles Made By

Answer 5

Prevertebral Layer of deep cervical fascia

Below the DC Fascia~

Semispinalis Capitis
Splenius Capitis
Levator scapulae
Scalenus - post, medius, ante

Question 6

Roof of Posterior Triangle Made By

Answer 6

Skin

Superficial fascia

Platysma Muscle

External Jugular Vein

DCF - Investing Layer

Cutaneous branches of cervical plexus (forms roof and content)

Question 7

Cutaneous Branches of Cervical Plexus

Answer 7

Great auricular nerve

Lesser occipital nerve

Transverse cervical nerve

Supraclavicular nerve

(Forms roof and content of posterior triangle)

Question 8

Most superficially located content of occipital triangle

Answer 8

Spinal Part of Accessory Nerve

Because it is present b/w the Investing layer (roof) and Prevertebral layer (floor)

Innervates SCM and Trapezius

Question 9

Nerve from C5 Root of Brachial Plexus

Answer 9

Dorsal Scapular Nerve

Innervates ~

Rhomboid Major
Rhomboid Minor

Question 10

Contents of Occipital Triangle

Answer 10

Spinal Part of Accessory Nerve

Cutaneous branches of cervical plexus

Proprioceptive fibres from Trapezius-C3, C4

C5 Root of brachial plexus - Dorsal Scapular Nerve

Transverse cervical artery

Occipital artery

Question 11

Subclavian artery divided into 3 parts by

Answer 11

Scalenus Anterior

Question 12

Contents of SupraClavicular / SubClavian Triangle

Answer 12

3rd Part of subclavian artery

SupraScapular Artery

Dorsal scapular artery

Subclavian vein

Trunk of Brachial plexus

Long Thoracic Nerve {C5, C6, C7}

SupraScapular Nerve {C5, C6}

Question 13

Content of SubMental Triangle

Answer 13

SubMental Nodes

Question 14

Content of Muscular Triangle

Answer 14

Infrahyoid Muscles

Question 15

Nerve to Mylohyoid Muscle supplies

Answer 15

Mylohyoid And Anterior Belly of Digastric

All 3 are Derivatives of 1st Arch

Question 16

Nerve to Mylohyoid arising from

Answer 16

Posterior Division Of Mandibular Nerve ~ Inferior Alveolar Nerve ~ Nerve To Mylohyoid

Question 17

Contents of Digastric Triangle

Answer 17

Superficial part of SubMandibular Gland

Facial artery and vein

Nerve to Mylohyoid

Hypoglossal Nerve (XII) is content of Both Carotid and Digastric Triangle

Question 18

Boundaries of Carotid Triangle

Answer 18

Above and Front ~
Post. Belly of Digastric
Stylohyoid Muscle

Below and Front ~
Superior Belly of Omohyoid

Behind ~
Anterior Margin of SCM

Question 19

Structures within Carotid Sheath

Answer 19

Common Carotid Artery
Internal Jugular Vein
Vagus Nerve

Question 20

CCA Bifurcates at

Answer 20

C3 - C4 (C4 > C5)

Or

Upper Border of Lamina of Thyroid Cartilage

Question 21

Carotid body situated at

Answer 21

At the level of Bifurcation of CCA

Is yellow pigmented Structure

Acts as Chemoreceptor ~ maintains chemical composition

Question 22

Fusiform dilation of ICA is called

Answer 22

Carotid Sinus

Acts as Baroreceptor ~ maintains Pressure

Question 23

Tumor in the Carotid Body leads to

Answer 23

Splaying of ICA and ECA

Which gives an appearance of Lyre ~ Lyre Sign

Question 24

1st Branch of ECA

Answer 24

Superior Thyroid Artery

Question 25

Anterior Branches of ECA

Answer 25

Superior Thyroid Artery Lingual Artery Facial Artery

Question 26

Posterior Branches of ECA

Answer 26

Occipital Artery | Posterior Auricular Artery

Question 27

Thinnest Branch of ECA

Answer 27

Ascending Pharyngeal Artery ~ in medial side

Question 28

Terminal Branches of ECA

Answer 28

Maxillary Artery | Superficial Temporal Artery

Question 29

Branches of ECA not present in the Carotid Triangle

Answer 29

Terminal Branches (arises at the level of neck of mandible) Posterior Auricular Artery

Question 30

Arteries present in the Carotid Triangle

Answer 30

1. CCA 2. ECA 3. ICA 4. Superior Thyroid Artery 5. Lingual Artery 6. Facial Artery 7. Occipital Artery 8. Ascending Pharyngeal Artery Internal Jugular Vein

Question 31

Contents of Carotid Triangle

Answer 31

5 Nerves; ``` Vagus Nerve Ansa Cervicalis Cervical Sympathetic Chain Hypoglossal Nerve Spinal Accessory Nerve ``` 1 Vein; Internal Jugular Vein 8 Arteries; ``` CCA, ICA, ECA Superior Thyroid Artery Lingual Artery Facial Artery Occipital Artery Ascending Pharyngeal Artery ```

Question 32

Floor Muscles of Digastric Triangle

Answer 32

Mylohyoid Muscle Hyoglossus Muscle Middle Constrictor Muscle Middle Constrictor And Hyoglossus forms floor for Carotid and Digastric Triangle

Question 33

Floor Muscles of Carotid Triangle

Answer 33

Muscles arising from Thyroid Cartilage and Hyoid Bone Thyrohyoid Muscle Inferior Constrictor Middle Constrictor Hyoglossus Muscle

Question 34

Boundaries of Suboccipital Triangle

Answer 34

Above and Medially; Posterior margin of rectus capitis Above and Laterally; Oblique capitis superior Below and Laterally; Oblique capitis inferior

Question 35

Floor of SubOccipital Triangle is formed by

Answer 35

Posterior Atlanto-Occipital Membrane Posterior Arch of Atlas

Question 36

Contents of SubOccipital Triangle

Answer 36

3rd Part of Vertebral Artery SubOccipital Nerve ~ Dorsal Rami of C1