Vascular System Flashcards
The vascular system of the head and neck consists of:
• Arterial blood supply
• Capillary networks
• Venous drainage
A large network of vessels within the vascular system is a
vascular plexus
Blood vessels may communicate with each other within vascular system by way of__
anastomosis (plural anastomoses)
What are Anastomosis?
cross-connection between blood vessels
Anastomosis between arteries are ___
arterio-arterial anastomosis
Anastomosis between veins are
veno-venous anastomosis
Anastomosis between arteries and veins are
arterio-venous anastomosis
Function of anastomoses
Serve as backup routes for the flow of blood if one vessel is blocked or otherwise compromised
There are how many layers or tunics for every blood vessel?
Three
What are the layers or tunics for every blood vessel?
• Tunica externa - outer connective tissue layer.
• Tunica media - middle smooth muscle layer with varying amounts of elastic fibers.
• Tunica intima - inner endothelium that lines the blood vessels.
An artery is part of the___ blood supply
arterial
Arteries begin at the____ and carries blood
heart; away from it
Each artery starts as a large vessel and branches into smaller vessels, forming___
arterioles
Arterioles branch into smaller vessels, forming____
networks of capillaries
A vein is part of the ____to drain blood from an area
venous drainage system
Smallest parts of the veins, called____, drain capillaries of their blood supply
venules
Venules coalesce to form___
larger veins
Veins travel____, carrying blood to it
to the heart
Capillaries have a___ diameter
than arterioles
smaller
Capillaries can supply blood to a larger tissue area because they are_____
more numerous and work together as a network
Capillary networks are present throughout the body for
the exchange of oxygen, metabolic waste products, and carbon dioxide between blood and tissue cells
What are different kinds of venous networks in the body?
• Superficial veins - Found immediately deep to the skin
• Deep veins - Usually accompany larger arteries in a deeper, more protected location within the tissue
Venous sinuses are_____
blood-filled spaces between two layers of tissue
Venous networks are connected by
anastomoses
The major arteries that supply the head and neck include___
the common carotid and subclavian arteries
How are the origins from the heart of the common carotid and subclavian arteries different for the right and left sides of the body?
• Left side of the body: these arteries originate directly from the aorta
• Right side of the body: these arteries branch off from the brachiocephalic artery
What are the direct branches of the aorta?
Brachiocephalic artery
Left subclavian
Left common carotid
The common carotid artery is a major artery supplying blood to the
brain
Does the common carotid artery have branches?
No
The common carotid travels
superiorly along the neck, lateral to the trachea and larynx, to the superior border of the thyroid cartilage
Travels in the carotid sheath with the internal jugular vein and vagus nerve deep to the sternocleidomastoid muscle
Common carotid artery
What is in the carotid sheath?
internal jugular vein, common carotid and the tenth cranial nerve (X) (vagus nerve)
• Carotid sheath is part of the___ of the neck
deep cervical fasciae
The common carotid artery ends by dividing into the_______
internal and external carotid arteries around the level of the larynx
• Just before the common carotid artery splits into the internal and external carotid, it exhibits a swelling called the___
carotid sinus
The carotid sinus is the location for obtaining the
carotid pulse
The subclavian artery begins____
lateral to the common carotid artery
The subclavian artery travels___
upwards and laterally between the anterior and middle scalene muscles
The subclavian artery supplies blood to the
head, neck, and arms (upper arms)
The internal carotid artery travels
superiorly, in a slightly lateral position to the external carotid artery in the carotid sheath
This artery is covered by the SCM
Internal carotid artery
What are the divisions of the common carotid artery?
Internal and external carotid
Are there branches of the internal carotid artery located in the neck?
No
The internal carotid artery supplies blood to___
intracranial structures and is the source of the ophthalmic artery
Supplies the eye, orbit, lacrimal gland, much of the forehead
The external carotid artery travels
superiorly, in a slightly medial position to the internal
The external carotid artery supplies blood
extracranial tissue of the head and neck, including the oral cavity
The external carotid artery has what four branches?
Anterior branch
Medial branch
Posterior branch
Terminal branch
There are how many anterior branches of the external carotid artery?
3
What are the three anterior branches of the external carotid artery?
Superior Thyroid Artery
Lingual Artery
Facial Artery
What are the four branches of the superior thyroid artery?
• Infrahyoid artery
• Sternocleidomastoid branch
• Superior laryngeal artery
• Cricothyroid branch
The branches of the superior thyroid artery supplies what structures?
supply the structures inferior to the hyoid bone; infrahyoid muscles, SCM, muscles of the larynx, and thyroid gland
What are the branches of the lingual artery?
Dorsal lingual branch
Deep lingual branch
tonsillar branches
sublingual branch
suprahyoid branch
The Dorsal lingual branch and Deep lingual branch of the lingual artery supply blood to what structure?
Tongue
The sublingual branch of the lingual artery supplies blood to___
mylohyoid muscle, sublingual salivary gland, oral mucosa of the floor of the mouth, periodontium, and mandibular gingiva
The tonsillar branches of the lingual artery supply blood to ____
The lingual tonsils and soft palate
The suprahyoid branch of the lingual artery supplies
The suprahyoid muscles
What are the branches of the facial artery?
• Ascending palatine artery (cervical)
• Tonsillar branches (cervical)
• Submental artery (cervical)
• Glandular branches (cervical)
• Inferior labial artery (facial)
• Superior labial artery (facial)
• Angular artery (facial)
The facial artery runs from the
inferior border of the mandible, anteriorly and superiorly near the labial commissure and along the lateral side of the naris of the nose and terminates at the medial canthus of the eye
The facial artery supplies the
face in the oral, buccal, zygomatic, nasal, infraorbital, and orbital regions
What are the cervical branches of the facial artery?
Glandular branch
Tonsillar branch
Ascending palatine artery
Submental artery
The Ascending palatine artery supplies
soft palate, palatine muscles
Tonsillar branches of the facial artery supply
palatine tonsils
Submental artery supplies
submandibular lymph nodes, mylohyoid and digastric muscles
Glandular branches of the facial artery supplies
submandibular salivary gland and nearby muscles
What are the facial branches of the facial artery?
Inferior labial artery
Superior labial artery
Angular artery
Inferior labial artery Supplies
lower lip area including that area’s muscles of facial expression
Superior labial artery Supplies
upper lip area including that area’s muscles of facial expression
Angular artery Supplies
the lateral naris of the nose
There are how many medial branches from the external carotid artery?
Only one
What artery is apart of the medial branch of the external carotid?
Ascending Pharyngeal Artery
This artery is small. Cannot be viewed in most lateral views of the head and neck
Ascending pharyngeal artery
How many branches are apart of the ascending pharyngeal?
Has many small branches that include the pharyngeal branch and the meningeal branch
The pharyngeal branch and meningeal branch of the ascending pharyngeal artery supply
the pharyngeal walls, soft palate, and meninges
What are Meninges?
three layers of membranes that cover and protect the brain and spinal cord
If there is serious blood loss or bleeding during a tonsillectomy, it is from this artery
Ascending pharyngeal artery
There are how many posterior branches of the external carotid artery?
There are two
What are the two posterior branches of the external carotid artery?
Occipital Artery
Posterior Auricular Artery
What are the branches of the Occipital Artery?
sternocleidomastoid branch
muscular branches
auricular branch and meningeal branch
Descending branches
The SCM branch of the occipital artery supplies the
SCM
The occipital artery supplies the
Occipital region and many other regions by its branches
The muscular branches of the occipital artery supplies
other muscles such as the suprahyoid muscles
The auricular branches of the occipital artery supplies
Auricular region
The meningeal branches of the occipital artery supply
The meninges
The descending branches of the occipital artery supply
Trapezius muscle
Branches of the occipital artery undergo anastamoses between the
external carotid and the subclavian artery to provide regional collateral circulation
Small. Begins superior to the occipital artery and stylohyoid muscle at approximately the level of the tip of the temporal bone’s styloid process
Posterior auricular artery
The posterior auricular artery has what branches
auricular branch
stylomastoid artery
The auricular branch of the posterior auricular artery supplies
the internal ear