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Flashcards in Lesson 1A (Part 1) Deck (31)
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1

What structures do you look at with high resolution imaging?

Superficial structures

2

What kind of images do you get with high resolution?

High definition images
- better detail

3

What transducer do you use with high resolution?

7.5-15MHz

4

What format do you get with high resolution imaging? (2)

1. Linear array
2. Trapezoid

5

What do you use to asses vascularity with high resolution imagin?

Doppler

6

Where is the thyroid gland situated?

In the neck in front of the larynx and trachea
- at the level of the 5th, 6th and 7th cervical and 1st thoracic vertebrae

7

Is the thyroid gland highly vascular?

Yes

8

How much does the thyroid weigh?

25g

9

What is the thyroid gland surrounded by?

A fibrous capsule

10

What is the shape of the thyroid gland?

Butterfly shaped
- consisting of two lobes, one on either side of the thyroid cartilage and upper cartilaginous rings of the trachea

11

What are the thyroid lobes joined together by?

The isthmus

12

What shape are the thyroid lobes?

Cone

13

How long and wide are the lobes of the thyroid gland? (2)

1. Long = 5cm
2. Wide = 3cm

14

What does the fibrous capsule allow from the thyroid gland?

Allows us to have good definition to be able to image the gland

15

What is the most common variant of the thyroid gland?

Pyramid lobes

16

Lingual thyroid variant

Is when the thyroid tissue is embedded in the tongue

17

What symptoms does the lingual thyroid show?

Usually none
- asymptomatic

18

What happens with lingual thyroid?

Mass becomes large

19

What happens when there is a large mass in the throat region? (3)

1. Dysphagia
- difficulty swallowing
2. Dysphonia
- difficulty speaking
3. Dyspnea
- difficulty breathing

20

When is there no thyroid gland in the neck?

With the lingual thyroid variant

21

What are 2 questions you can ask if you dont see the thyroid in the neck?

1. Have you had surgery?
2. Have you had any chemotherapy?

22

Arterial blood supply?

Superior and inferior thyroid arteries

23

What is the superior thyroid artery a branch of?

The external carotid artery

24

What is the inferior thyroid artery a branch of?

The subclavian artery

25

How do you get venous return in the thyroid?

Through thyroid veins

26

What do the thyroid veins drain into?

The internal jugular veins

27

Where do the 2 parathyroid glands lay?

Against the posterior surface of each lobe
- sometimes embedded in the thyroid tissue

28

Where does the recurrent laryngeal nerve pass?

Upwards close to the lobes of the gland
- on the right side it lies near the inferior thyroid artery

29

What are the borders of the thyroid gland? (4)

1. Laterally = common carotid arteries and the SCM muscles
2. Anterior/laterally = Jugular veins
3. Anterior = strap muscles
4. Posterior = longus coli muscles

30

What are the 3 strap muscles?

1. Sternohyoid
2. Sternothyroid
3. Omohyoid