Flashcards in Session 1 - Part II Deck (22):
What does the common carotid artery biforcate into?
What is the Thyrocervical trunk?
A branch of the subclavian artery. It splits into 4 vessels shortly after it originates
What does the Thyrocervical trunk divide into?
Inferior thyroid artery
Ascending cervical artery
Transverse cervical artery
Does the internal carotid artery give branches?
No it goes straight to the brain
Does the external carotid artery give branches?
Yes, it supplies the head and neck
At what level does the common carotid biforcate?
The superior border of the thyroid cartilage (Approx C4)
What is a common site for atheroma in the neck?
The common carotid artery causing stenosis. If it ruptures it can cause an embolism leading to a TIA/Stroke
What are the contents of the carotid sheath?
Common carotid artery
Internal jugular vein
Some cervical lymph nodes
Where can the carotid pulse be felt?
In the Carotid triangle
Where can the carotid massage be performed?
In the Carotid triangle
What is the clinical use of the Carotid triangle?
Surgical access to arteries, Internal jugular vein, Hypoglossal and vagus nerve
Carotid pulse can be felt
Carotid massage can be performed
Name a branche of the Internal carotid?
What does the Opthalmic artery branch into?
The Supraorbital artery
The Supratrochlear artery
How many branches does the External carotid artery give off?
6 branches in the head and 2 terminal branches
Supply the scalp
Why does the scalp bleed badly when lacerations occur?
The arteries have limited constriction
If the laceration is through the epicranial aponeurosis the muscles pull the cut apart more
What is the venous drainage of the scalp?
Supraoribital vein and supratrochlear vein unite at the medial angle of the eye to become the Angular vein. This then drains into the facial vein
What is unique about the veins in the scalp?
The are valveless
*Means infection can spread to the cranial cavity from the scalp and then affect the meninges*
What are Dural venous sinuses?
Venous channels found between layers of dura mater in the brain.
What are the arteries supplying the Dura and skull?
Maxillary artery gives off middle meningeal artery which then biforcates into anterior and posterior
What is the Pterion?
Where the 4 bones of the skull meet
What is the clinical significance of the Pterion?
Weak point of the skull so a blow to the head here would damage the middle meningeal artery
*Causes extradural haemorrhage which would pull the dura away*