6. Angiology and Neuro Flashcards
Where does the common carotid a. branch from?
- Right side: brachiocephalic trunk
- Left side: aortic arch
Carotid Sheath houses the
- Common Carotid A.,
- Internal Jugular V.
- Vagus N.
What is the carotid sinus?
Swelling of common carotid a. where it branches into:
- Internal carotid A.
- External carotid A.
Does the internal carotid a. have cervical branches?
No
Where does the external carotid a. travel?
- Travels superiorly between the mandible and the external ear, embedded in the parotid gland
- terminates as the
- Maxillary A.
- Superficial Temporal A.
External Carotid branches
-
Superior thyroid A -> goes inferiorly to thyroid gland, below infrahyoid ms.
* Sternocleidomastiod Branch-> anastomoses with sternocleidomastoid branch of the occipital a.
* Infrahyoid Muscular Branches
* Superior Laryngeal A. -> larynx -
Ascending pharyngeal A-> travels superior, deep to internal carotid A.
* -> Pharynx, Anterior Vertebral Muscles, Middle Ear and Cranial Meninges -
Lingual A -> travels superiorly, deep to hypoglossal N., stylohyoid m, and posterior belly of the digastric m
* becomes the Dorsal Lingual A., Deep Lingual A. and Sublingual A. -> tongue -
Facial A -> travels up deep to digastric M. and stylohyoid m, gives off branches, goes underneath mandible -> face
* Ascending Palatine Branch -> soft palate, where it anastomoses with Lesser Palatine A. from Descending Palatine A. of Maxillary A.
* Tonsilar Branch -> palatine tonsils
* Submental Branch -> submandibular gland - Occipital A. -> goes to posterior scalp, superficial to the internal carotid A.
- Sternocleidomastiod branch
- Descending Branch
- Posterior Auricular A. -> goes posterior between external auditory. meatis and mastiod process
- Parotid gland
- Facial N
- Temporal bone
- Auricle scalpe
—-Terminates into—-
A. Maxillary A.
B. Superficial Temporal A.
Carotid sinuses are sensitive to __________ d/t …
Carotid bodies are sensitive to __________ d/t …
Carotid sinuses are sensitive to BP d/t baroreceptors
Carotid bodies are sensitive to blood composition (O2 content) d/t chemoreceptors.
CN: Carotid Sinus Hypersensitivity Syndrome:
The carotid sinus may be hypersensitive to pressure. Pressure of the artery can cause _____________.
- slow HR
- decreased BP
- Fainting (syncope)
Carotid bodies (chemoreceptors) exist at the__________ and monitor the oxygen content of blood before what?
Carotid Bodies (chemoreceptors) exist at the carotid sinus and monitor the oxygen content of blood before it reaches the brain.
Adjustments to heart rate, respiratory rate and blood pressure can be made accordingly based on the oxygen content in the carotid sinus via _______________.
1. Glossopharyngeal N.
2. Vagus N.
Regions of the subclavian A.
- Region One (proximal to Anterior Scalene M.)
- Region Two (deep to Anterior Scalene M.)
- Region Three (distal to Anterior Scalene M., proximal to 1st Rib)
Subclavian A: Region 1
1. Vertebral A -> goes superiorly in the transverse foramina of
Cervical Vertebrae
- Internal thoracic A -> goes inferior to anterior chest wall
3. Thyrocervical Trunk
- Inferior thyroid A -> thyroid gland
- Suprascapular A -> goes through superior scapular notch over transverse scapular L -> supraspinatus m. and infraspinatus m.
-
Transverse Cervical A -> goes posterior across phrenic N and anterior scalene m and the brachial plexus to the deep surface of the Trapezius M
- Superficial branch -> trapezius m.
- Deep branch -> rhomboid major/minor, levator scapulae
Subclavian A: Region 2
(deep to anterior scalene)
Costocervical Trunk
- Deep Cervical A.
- -> goes to lateral and posterior neck muscles/ spinal branches and anastomoses with descending branch of Occipital A.
- Supreme Intercostal A
- -> 1st intercostal space
Subclavian A: Region 3
(distal to anterior scalene M, proximal to 1st rib)
-
Dorsal scapular A.
- Goes superior to scapula -> along medial border of scapula -> [levator scapulae and rhomboid ms.]
Dorsal Scapular A can branch off of what?
1. Subclavian A.
2. Transverse cervical A (if so, it is known as the deep branch of the transverse cervical A)
What forms our superior vena cava (SVC)?
Union of R and L brachiocephalic V
Draw SVC
The ___________ is often the point of entry for central line placement, or other diagnostic or therapeutic purposes.
Subclavian Vein
Besides the subclavian vein, what other vein can we puncture for diagnostic/therapeutic purposes?
- Internal Jugular Vein
- Right Internal Jugular V. is typically preferred since it is larger and straighter.
CN: Central Line Placement
Central Lines are used to
- administer venous nutritional fluids and medications
- measure central venous pressure.
via the L/R subclavian vein.
The ____________ may serve as an “internal barometer”.
External Jugular V.
The External Jugular V. may serve as an “internal barometer”.
How so?
- When venous pressure rises, the external jugular vein becomes much more visible along lateral neck.
- This can tell us: CHF, SVC obstruction, enlarged supraclavivular LN or increased intrathoracic pressure.
What are your superificial cervical LN?
- Superficial Parotid Lymph Nodes
- Occipital Lymph Nodes
- Mastoid Lymph Nodes
- Lateral Superficial Lymph Nodes
- Anterior Superficial Lymph Nodes
Where do superificial cervical LN drain into?
Inferior Deep Cervical Lymph Nodes.