Triangles of the Neck

Question 1

Boundaries of the Posterior Triangle

Answer 1

Anterior Border of Trapezius
Posterior Border of SCM
Middle 1/3 Clavicle
Roof - Deep Cervical Fascia
Floor - Prevertebral Fascia on Scalene Muscles

Question 2

What nerve supplies SCM?

Answer 2

Accessory (spinal part)

Question 3

Name the insertion of Trapezius

Answer 3

Lateral 1/3 of Clavicle, spine and acromium of scapula.

Question 4

Name the nerve roots of the Greater Auricular Nerve. What does it supply?

Answer 4

C2-C3. Parotid Capsule

Question 5

which nerve of the cervical plexus solely carries C2 fibres?

Answer 5

Lesser occipital nerve

Question 6

What are the nerve roots of the supraclavicular nerves?

Answer 6

C3 and C4

Question 7

Which nerves of the cervical plexus have nerve roots C2 and C3?

Answer 7

Transverse Cervical an Greater Auricular

Question 8

Over which muscle does the accessory nerve run?

Answer 8

Levator Scapulae

Question 9

What muscles are supplied by the nasal cervicalis?

Answer 9

Infrahyoid muscles except thyrohyoid.

Question 10

What is the nerve root innervation of thyrohyoid?

Answer 10

C1.

Question 11

Which nerves emerge through scalenus medius?

Answer 11

Dorsal scapula and long thoracic

Question 12

Name the innervation of Scalenus Anterior

Answer 12

C4-C6

Question 13

Where do the scalene muscles ariginate?

Answer 13

Middle (C2-C6)
Anterior (C3-C6)
Posterior (C4-C6)

Question 14

Which scalene muscle has the innervation C3-C8?

Answer 14

Scalenus Medius

Question 15

Which scalene muscle has the innervation C4-C6?

Answer 15

Scalenus Anterior

Question 16

Which scalene muscle has the innervation C6-C8?

Answer 16

Scalenus Posterior

Question 17

What is the origin, insertion and innervation of levator scapulae?

Answer 17

Transverse processes of C1-C4
Medial scapulae Border
C3-C5

Question 18

Which muscle in the posterior triangle inserts into the mastoid process? What is the innervation of this muscle? And it’s origin?

Answer 18

Splenius Capitus. C3-C4. Spinous processes of C7-T3

Question 19

What structure is found in the interscalene space?

Answer 19

Brachial Plexus

Question 20

Where is the phrenic nerve located in the posterior triangle?

Answer 20

Lateral to the EJV.

Question 21

Name the boundaries of the Anterior Triangle.

Answer 21

Inferior border of the mandible
Midline
Anterior Border of SCM

Question 22

Which muscle of the anterior triangle is most lateral: posterior belly of digastric or stylohyoid?

Answer 22

Posterior belly of digastric

Question 23

Name the infrahyoid muscles. What are they innervated by?

Answer 23

Thyrohyoid
Sternothyroid
Sternohyoid
Omohyoid
Innervates by Ansa Cervicalis

Question 24

Which vessels can be identified in the anterior triangle? Which one lies most medially?

Answer 24

Common carotid artery (Medial) and Internal Jugular Vein

Question 25

Name the structures contained within the carotid sheath:

Answer 25

Internal Jugular Vein, Common carotid Artery, Vagus Nerve

Question 26

On which nerve do C1 fibres traverse to reach the thyrohyoid muscle?

Answer 26

Hypoglossal

Question 27

what is platysma?

Answer 27

Muscle of facial expression supplied by the facial nerve.