Neck Triangles Flashcards

1
Q

What are the borders of the posterior triangle of the neck

A

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

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2
Q

Where is the apex of the posterior triangle

A

Point between scm and the trapeziusat occipital nuchal line

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3
Q

What is the roof to the posterior triangle

A

Investing layer of deep cervical fascia

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4
Q

What su the floor to the posterior triangle

A

Deep cervical fascia

Prevertebral fascia

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5
Q

What su the main contents of the posterior triangle

A

Spinal accessory nerve CN 11

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6
Q

Where does the spinal accessory nerve arise from

A

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

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7
Q

What su the pathway of the spinal accessory nerve

A

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

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8
Q

What does the spinal accessory do

A

Somatic motor innervation to scm and trapezius

Motor from anterior roots sensory posterior roots

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9
Q

How do u test the spinal accessory nerve

A

Scm by rotation and looking up

Trapezius by shrugging shoulders

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10
Q

What are the borders of the anterior triangle

A

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

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11
Q

Where is the apex of the anterior I triangles

A

Jugular notch

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12
Q

What is the roof of the anterior triangle

A

Subcutaneous tissue and platysma

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13
Q

What is the floor to the anterior triangle

A

Pharynx
Larynx
Thyroid gland

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14
Q

What are the divisions of the anterior triangle

A

Supra hyoid - su mental and submandibular

infrahyoid - carotid and muscular

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15
Q

What flames the floor of the mouth

A

Mylohyoid

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16
Q

What triangle isn’t dual sided

A

Sub mental underneath the mental protuberance

17
Q

What are the borders of the sub mental triangle

A

Anterior and posterior bellies of digrastic

Hyoid bone

18
Q

What is the floor of the su mental triangle

A

Mainly formed by the mylohyoid muscle

19
Q

What are the contents of the submental triangle

A

Anterior jugular vein

Lymph nodes submental

20
Q

What do the submental lymph nodes drain

A

Drain lymph from the tongue tip
Lower lip
Lower incisors

21
Q

What are the contents of the submandibular triangle

A
Digrastic muscle 
Mylohyoid 
Submandibular gland
Facial artery 
Facial vein 
Submandibular lymph nodes
Hypoglossal nerve
22
Q

What does the hypoglossal nerve do

A

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

23
Q

What are the contents of the carotid triangle

A

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

24
Q

When does the common carotid artery bifurcate

A

At level of laryngeal prominence

25
What is the Ansa cervicalis
Made up of hypoglossal nerve C1- motor - descendens hypoglossi C2,3- motor - descendens cervicalis
26
What does the Ansa cervicalis do
Motor supply to strap muscles except the thyrohyoid which is solely supplied by c1
27
What are the contents of the muscular triangle
Strap muscles
28
What are the strap muscles
Omohyoid Sternohyoid Sternothyroid Thyrohyoid
29
What is the innervation of the strap muscles
All innervated by Ansa cervicalis excite thyrohyoid
30
What are the neck triangles
``` Posterior Anterior - submandibular - sub mental - muscular - carotid ```