Veins

Question 1

How does blood drain from the eyelids to the vena cava?

Answer 1

Eyelids- angular vein- facial vein- Right internal jugular which joins with the R subclavian to create the brachiocephalic, then vena cava

Question 2

How does blood drain from the conj to the vena cava?

Answer 2

Conjunctiva- conjunctival veins- anterior ciliary veins- muscular vein- superior or inferior ophthalmic vein- cavernous sinus- superior or inferior petrosal sinuses- R internal jugular vein joins the R subclavian to form the brachiochephalic- Vena cave

Question 3

Angular vein can pass on deoxygenated blood to which 2 veins, in order to dump into the vena cava?

Answer 3

Facial vein- R internal jugular- brachiocephalic- vena cava

Superior ophthalmic vein- cavernous sinus- sup or inferior petrosal sinuses- R internal jugular- brachiocephalic- vena cava

Question 4

The inferior ophthalmic vein can pass on deoxygenated blood to which 2 veins, in order to dump into the vena cava?

Answer 4

Cavernous sinus- superior or inferior petrosal sinuses- R internal jugular vein- brachiocephalic- vena cava

Pterygoid plexus- maxillary vein- retromandibular vein- external jugular- R subclavian which joins with the R internal jugular to form the brachiocephalic- vena cava

Question 5

Which two veins provide the main route for drainage of deoxygenated blood from the eye to the heart

Answer 5

Superior and inferior ophthalmic veins

Question 6

The right and left superior ophthalmic veins are formed by the joining of which veins

Answer 6

The angular and supraorbital veins within the orbit.

The supraorbital veins enter the orbit through the supraorbital foramen and then angular veins enter the orbit through the orbital septum above the medial palpebral ligament.

As the superior ophthalmic vein courses posteriorly, it receives blood from veins that drain the superior structures of the eye.

Question 7

How does the R and L superior ophthalmic vein exit the orbit and what does it empty into?

Answer 7

The veins exit the orbit through the superior and inferior orbital fissures and empty into the cavernous sinus.

Question 8

How are the R and L inferior ophthalmic veins formed, where does it travel, and what does it empty into?

Answer 8

They begin as a plexus near the anterior floor of the orbit. As it courses posteriorly, it receives blood from veins that drain the inferior structures of the eye. Exits the orbit through the inferior orbital fissure and empties into the cavernous sinus or the pterygoid plexus.

Question 9

What is the cavernous sinus and where is it located?

Answer 9

Paired (R and L) dural venous sinus. It is a sinus between two layers of the dura mater (periosteal is the outer and meningeal is the inner). Located on the lateral side of the sphenoid bone body and sella turcica. Extends from the superior orbital fissure anteriorly to the petrous part of the temporal bone posteriorly.
Divided by numerous fibrous septa into a series of small caves, allowing 4 nerves and 1 artery to pass thru.

Question 10

Which 4 nerves and 1 artery passes through the cavernous sinus?

Answer 10

CN- 3, 4, 5(1, 2, 3), 6

Artery- Internal carotid artery

Question 11

Superior vena cava

Answer 11

Returns deoxygenated blood from the upper half of the body to the right atrium of the heart.