Anatomy of the Thyroid Gland Flashcards Preview

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Flashcards in Anatomy of the Thyroid Gland Deck (31):
1

What is the thryoid usually made up of?

2 lateral lobes and an isthmus

2

Where do the thyroid lobes attach?

Lateral aspects of the thyroid and cricoid cartilages and to the trachea

3

Where does the isthmus lie?

Anterior to the 2nd and 3rd trachael cartilages

4

If the thyroid gland is enlarged or there is a lump, which direction will it move?

Superiorly then inferiorly with the larynx during swallowing

5

How many and where are the parathryiod glands located?

4 - The posterior surface of the thyroid glands lateral lobes

6

What do 22-55% of the population have with regard to the anatomy of the thyroid gland?

A pyrimidal lobe

7

What and where are the platysma muscles?

Belong to the group of "muscles of facial expression" and are locted immediately deep to the skin, within the superficial fascia of the neck

8

What nerve supplies the patysma muscles?

Cranial nerve VII (facial nerve)

9

Name the 4 fascial compartements of the neck?

Investing (deep) fascia
Carotid sheaths
prevertebral fascia
Pretracheal fasica

10

Where is and what is the purpose of the investing fascia?

Foud deep to the superficial fascia and encloses all other neck compartments and the trapezius and sternocleidomastoid muscles

11

Where is the prevertebral fascia found and what does it enclose?

Posteriorly and deep to the investing fascia
encloses the cervical vertebrae and the postural neck muscles

12

Where are the 2 carotid sheaths?

Deep to the investing fascia & located anterolaterally in the neck either side of the thyroid gland

13

What is contained within the carotid sheaths?

- internal jugular veins
- vagus nerves
- carotid arteries
- deep cervical lymph nodes

14

What are the attachments of the carotid sheaths?

Attach sueriorly to the base of the skull
Blend inferiory with the mediastinal fascia

15

Where is the pretracheal fascia?

Anteriorly and deep to the investing fascia

16

What is enclosed within the pretracheal fascia?

Strap muscles
Trachea
recurrent laryngeal nerves
Thyroid gland
oesophagus

17

Where is the retropharyngeal space?

Between the pretracheal and prevertebral fascia

18

What are the attachments of the sterncleidomastoid muscles?

Sternal head - manubrium of sternum
Clavicular head - medial end of the clavicle
both heads pass superiorly to attach to the mastoid process of the temporal bone

19

What is the attachment of the descending part of trapezius?

Attaches inferiorly at the spine of the scapula ad the lateral end of the clavicle

20

What does the anterior jugular vein drain into?

External jugular vein

21

Describe the blood supply to the thyroid gland

Right and left superior and inferior thyroid arteries

22

What is the venous drainage of the thyroid gland?

Right and left superior middle and inferior thyroid veins

23

What is the lymphatic drainage of the thyroid gland?

Right and left superior and inferior deep cervical nodes

24

Name the tracheal lymph nodes.

Pretracheal lymph nodes
Paratracheal lymph nodes

25

Name the 4 strap muscles.

Omohyoid
Thyrohyiod
Sternothyroid
Sternohyoid

26

Which strap muscle has a fascial sling associated with it?

Omohyoid

27

Where does the recurrent laryngeal nerve run?

Asceds in the groove between the trachea anteriorly and the oesophagus posteriorly

28

The recurrent laryngeal nerve supplies somatic motor to what?

Most of the skeletal muscles that move the vocal cords (intrinsic muscles of the larynx)

29

What happens if there is reurrent laryngeal nerve injury?

Paralysis of the vocal cords

30

What does unilateral recurrent laryngeal nerve injury result in?

hoarseness or weakness of the voice and a weak cough

31

What does bilateral recurrent laryngeal nerve injury result in?

Aphonia (inability to produce sound) and inability to close the rima glottidis to prevent aspiration or to produce a good cough