4) Major Blood Vessels Flashcards Preview

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Flashcards in 4) Major Blood Vessels Deck (38):
1

Which arteries provide the main supply to the head?

Common carotid and vertebral arteries

2

Which arteries provide the main blood supply to the neck?

Thryocervical trunk:
Inferior thyroid artery
Ascending cervical artery
Transverse cervical artery
Suprascapular arteries

3

Where do the vertebral arteries arise from?

Subclavian artery

4

What structures do the vertebral arteries travel through?

Transverse foramina of C1-6
Foramen magnum

5

What happens to vertebral arteries when in the skull?

Join with vertebral artery from other side to form basilar artery

6

What is the Circle of Willis?

Anastomosis in brain formed from basilar and internal carotid arteries

7

Where does the common carotid artery bifurcate?

Level of superior border of thyroid cartilage (C4)
(in carotid triangle)

8

What are located at the carotid bifurcation?

Carotid sinus - baroreceptors
Carotid body - peripheral chemoreceptors

9

What are the consequences of hypersensitive baroreceptors?

External pressure of carotid sinus causes decrease in HR and BP, brain underperfused = syncope

10

Why is the carotid bifurcation a common site of atheroma formation?

Swelling due to carotid sinus causes turbulence of flow

11

By what procedure can a carotid atheroma be removed?

Carotid endarterectomy

12

What are the consequences of a carotid atheroma?

Rupture leading to embolus and TIA/stroke

13

What are the boundaries of the carotid triangle?

Superior - posterior belly of digastric
Lateral - SCM
Medial - Superior belly of omohyoid

14

What is contained in the carotid triangle?

Common carotid artery
Internal jugular vein
Hypoglossal and vagus nerves

15

What is the importance of the carotid triangle?

Surgical approach to carotid, IJV or vagus nerve

16

What is a carotid massage and why is it performed?

Stimulation of baroreceptors to decrease HR, relieving supraventricular tachycardia

17

What are the terminal branches of the external carotid artery?

Superficial temporal artery and maxillary artery (deep)

18

What are the 6 branches of the external carotid artery?

Superior thyroid
Lingual
Facial
Ascending pharyngeal
Occipital
Posterior auricular

19

Where does the external carotid artery terminate?

Parotid gland

20

How does the internal carotid artery enter the cranial cavity?

Via carotid canal in petrous part of temporal bone

21

What does the internal carotid artery supply?

Brain, eyes, forehead

22

Which artery supplies the dura mater and the skull?

Middle meningeal artery

23

What procedure allows access to the cranial cavity?

Craniotomy, bone and scalp reflected inferiorly to preserve blood supply

24

Where can the facial artery pulse be felt?

Inferior border of mandible, anterior to masseter muscle

25

How can infection spread from scalp to meninges?

Through valveless emissary veins between veins of scalp and diploic veins of skull

26

What are dural venous sinuses?

Endothelial lined spaces between periosteal and meningeal layers of dura

27

What are the cavernous sinuses?

Plexuses of thin walled veins on lateral aspect of sphenoid bones. Receive blood from superior and inferior ophthalmic veins

28

What structures are found in the cavernous sinus?

Internal carotid artery and cranial nerves

29

Where do deep facial veins drain into?

Pterygoid venous plexuses

30

Why are veins of face susceptible to spread of infection?

Valveless so blood can flow in either direction

31

What veins drain into the external jugular vein and into which vein does EJV drain?

Posterior auricular, retromandibular and superficial temporal
Into subclavian vein

32

What vein drains the anterior neck?

Anterior jugular veins

33

How does the internal jugular vein begin?

Continuation of sigmoid sinus

34

Describe the route of the IJV to atrium:

Exits via jugular foramen into carotid sheath, lateral to artery. Combines with subclavian to from brachiocephalic vein

35

Into which vein does the facial vein drain into?

IJV

36

How should the JVP be measured?

Patient at 45 degree angle, height from sternal angle + 5cm, pulsations through SCM

37

What side is used to measure JVP and what does this show?

Right IJV, as direct communication to RA, so estimates pressure

38

What is a thrombophlebitis?

Infected clot into intracranial venous system