Sievert: Prelab Flashcards
What’s this?
Lies deep to the platysma
Crosses the SCM obliquely
external jugular vein
The external jugular vein is firmly attached to the fascia. Why can this be a problem?
when severed, the tough fascia will keep the lumen of the vessel open
What can easily occur when you severe the external jugular vein?
venous air embolism - which fills the right side of the heart w froth and stops blood flow through it, leading to dyspnea
Which internal jugular vein is larger and straighter?
right
*implications when inserting an internal jugular central venous line
Insertion points for a central venous catheter?
- internal jugular vein (right preferred)
2. subclavian vein *greater risk due to curvature of veins
What is the target of a central venous line?
superior vena cava
What are some complications that can arise when inserting a central venous line?
pneumothorax
infections
venous thrombosis
What structures must you beware of when accessing the internal jugular vein?
ansa cervicalis
common carotid artery
vagus nerve
The external jugular vein is located between what two structures?
SCM
platysma
A small cluster of chemoreceptors located at the bifurcation of the carotid artery
carotid body
What kind of changes does the carotid body detect? What is the carotid body innervated by?
O2, CO2, pH, temp;
sinus nerve of Hering off of CN 12
Localized dilation of internal carotid artery at its origin; contains baroreceptors which function in maintaining blood pressure; innervated by sinus nerve of Hering (CN 12)
Carotid sinus
What is carotid sinus hypersensitivity?
external pressure on the carotid artery can cause slowing of the heart rate
*don’t check pulse here on pts with cardiac/vascular disease
What are some morphological variants of the internal carotid artery? What effects can these have?
torturosity
coiling
kinking;
may effect blood supply of brain
Things that can compress the vertebral artery
shark neck movements
osteophytes
