Neck Triangles

Question 1

What are the borders of the posterior triangle of the neck

Answer 1

Posterior - trapezius
Anterior - scm
Under - middle 3rd of clavicle

Question 2

Where is the apex of the posterior triangle

Answer 2

Point between scm and the trapeziusat occipital nuchal line

Question 3

What is the roof to the posterior triangle

Answer 3

Investing layer of deep cervical fascia

Question 4

What su the floor to the posterior triangle

Answer 4

Deep cervical fascia

Prevertebral fascia

Question 5

What su the main contents of the posterior triangle

Answer 5

Spinal accessory nerve CN 11

Question 6

Where does the spinal accessory nerve arise from

Answer 6

The spinal cord rather than the base of the brain like the other cranial nerves

Question 7

What su the pathway of the spinal accessory nerve

Answer 7

From spinal cord loop through foramen magnum joins with vagus then split again to supply diff features

Question 8

What does the spinal accessory do

Answer 8

Somatic motor innervation to scm and trapezius

Motor from anterior roots sensory posterior roots

Question 9

How do u test the spinal accessory nerve

Answer 9

Scm by rotation and looking up

Trapezius by shrugging shoulders

Question 10

What are the borders of the anterior triangle

Answer 10

Superior - border of mandible
Middle - midline of the neck
Sides - anterior scm

Question 11

Where is the apex of the anterior I triangles

Answer 11

Jugular notch

Question 12

What is the roof of the anterior triangle

Answer 12

Subcutaneous tissue and platysma

Question 13

What is the floor to the anterior triangle

Answer 13

Pharynx
Larynx
Thyroid gland

Question 14

What are the divisions of the anterior triangle

Answer 14

Supra hyoid - su mental and submandibular

infrahyoid - carotid and muscular

Question 15

What flames the floor of the mouth

Answer 15

Mylohyoid

Question 16

What triangle isn’t dual sided

Answer 16

Sub mental underneath the mental protuberance

Question 17

What are the borders of the sub mental triangle

Answer 17

Anterior and posterior bellies of digrastic

Hyoid bone

Question 18

What is the floor of the su mental triangle

Answer 18

Mainly formed by the mylohyoid muscle

Question 19

What are the contents of the submental triangle

Answer 19

Anterior jugular vein

Lymph nodes submental

Question 20

What do the submental lymph nodes drain

Answer 20

Drain lymph from the tongue tip
Lower lip
Lower incisors

Question 21

What are the contents of the submandibular triangle

Answer 21

Digrastic muscle 
Mylohyoid 
Submandibular gland
Facial artery 
Facial vein 
Submandibular lymph nodes
Hypoglossal nerve

Question 22

What does the hypoglossal nerve do

Answer 22

Pass under the tongue so can supply all muscles of tongue intrinsic and extrinsic except palatoglosses
And then forms loop off of it which is the Ansa cerbicalis

Question 23

What are the contents of the carotid triangle

Answer 23

Carotid sheath which contains internal jugular vein common carotid artery (internal) and the vagus nerve
Lymph nodes deep cervical

Question 24

When does the common carotid artery bifurcate

Answer 24

At level of laryngeal prominence

Question 25

What is the Ansa cervicalis

Answer 25

Made up of hypoglossal nerve
C1- motor - descendens hypoglossi
C2,3- motor - descendens cervicalis

Question 26

What does the Ansa cervicalis do

Answer 26

Motor supply to strap muscles except the thyrohyoid which is solely supplied by c1

Question 27

What are the contents of the muscular triangle

Answer 27

Strap muscles

Question 28

What are the strap muscles

Answer 28

Omohyoid
Sternohyoid
Sternothyroid
Thyrohyoid

Question 29

What is the innervation of the strap muscles

Answer 29

All innervated by Ansa cervicalis excite thyrohyoid

Question 30

What are the neck triangles

Answer 30

Posterior 
Anterior 
- submandibular
- sub mental
- muscular
- carotid