The document discusses the common carotid arteries. It notes that there are two common carotid arteries - the right and left. The right common carotid artery arises from the brachiocephalic trunk, while the left arises from the aortic arch. In the neck, both arteries have a similar course upward in the carotid sheath under the anterior border of the sternocleidomastoid muscle, lying in front of the lower four cervical vertebrae. At the level of the thyroid cartilage, each artery divides into the external and internal carotid arteries. The document also discusses the carotid sheath, relations of the carotid arteries, the carotid sinus and body, and clinical relevance.

2. Study At: Lahore institute of
professional studies

3. Group Name: Group C
 Group member:
 Dr.Ihsan ul haq
 (introduction+root or course)
 Dr.Nimra qadeer
 (Relation of artry)
 Dr.Mehwish
 (Carotid sheath or sinus)

4. Topic common carotid artery
 There are two common carotid artery in our body.
 Right common carotid artery and left common carotid artery.
 Right common carotid artery is the branch of Brachiceocephalic
trunk.It begin in the neck behind the right sternoclavicular joint.
 Left common carotid artery is the branch of Arch of Aorta.it begin
in the thorax in the front of trachea.
 It ascends to the back of left sternoclavicular joint and enter the
neck.

5. Root for Right and Left common carotid
artery

6. Course of common carotid artery
 In the neck both Left and right common carotid artery have a similar course.
 Each artery run upward within the carotid sheath, under cover of anterior border
of sternocleidomastoid muscle.
 It lies in front of the lower four cervical transverse processes.
 At the level of upper border of thyroid cartilage,the artery end by dividing into the
external and internal carotid artery.

7. Course of common carotid artery

9. Carotid sheath

10. Relations of carotid arteries.
Anteriorly :
the common carotid artery is crossed by superior belly of
omohyoid at the level of cricoid cartilage.
Below the omohyoid artery is deeply situated and is covered by:
A: the sternocleidomastoid muscle
B:the anterior jugular vein
C: the sternohyoid muscle
D:the sternothyroid and middle thyroid vein.

11. Anterior relation

12. Posterior relations
Posteriorly :
. Transverse process of vertebrae
C4_C8,and muscle attach to their anterior tubercle
(Longus capitis and colli and scalenius anterior)
The anterior thyroid artery cross medially at the level of cricoid
cartilage.
Vertebral artery.
Thoracic duct on the left side.

13. Posterior relations

15. Medial Relations
Medially:
thyroid gland.
Larynx and pharynx;
Trachea, oesophagus
. Reccurent laryngeal nerve.

16. Medial Relations

17. Lateral relations

18. Posterolateral relations

19. Topic: common carotid artery

20. Common carotid artery

21. Diagram for carotid body and sinus

22. Clinical anatomy

23. Carotid sinus Syndrome
 The carotid sinus is richly supplied by nerves.
 In some person the sinus may be hypersensitive.
 In such person sudden rotation of head may cause slowing of heart.
 This condition is called carotid sinus Syndrome.
 The supraventricular tachycardia may be controlled by carotid sinus massage,due
to inhibitory effect of vagus nerve on heart.
 The necktie should not be tied tightly,as it may be compress both the internal
carotid arteries, supplying the brain.

24. Carotid sinus Syndrome

25. Revision
 Common carotid artery
 Origin
 Course
 Relation (anterior, posterior, medial, lateral, posterolateral)
 Carotid sinus or body
 Clinical of common carotid artery

26. Thank you

27. Anterior relations