nerves and pharynx info
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three branches off of the aorta
- brachiocephalic trunk
- left common carotid
- left subclavian
how many parts to the subclavian?
braches off of 1st part of subclavian
- thyrocervical trunk
- internal thoracic
branches off of the thyrocervical trunk
- suprascapular (sometimes)
- inferior thyroid
- ascending cervical
- transverse cervical
branches off of the second part of the subclavian
boundary between the first part of subclavian and second part of subclavian
= anterior scalene m.
seven branches of the external carotid artery
- facial a.
- lingual a.
- posterior auricular a.
- anterior pharyngeal a.
- superior thyroid a.
- occipital a.
- Terminal braches (maxillary a. & superior temporal a.)
located where the carotid splits into internal and external carotid a.
contains baroreceptors, which detect arterial blood pressure
contains chemoreceptors to detect the oxygen level in blood
in close relation to the carotid sinus
common carotid artery originates from where
L: the aorta
R: the brachiocephalic trunk
braches off of the 3rd part of the subclavian a.
dorsal scapular a.
(sometimes) suprascapular a.
what does the internal jugular vein lead into:
enters the Circle of Willis
"main blood supply to the head"
Nerves of the Neck
- spinal accessory nerve
- hypoglossal nerve
- vagus nerve
- cervical plexus
- brachial plexus
Branches of the Cervical Plexus
- ansa cervicalis
- phrenic nerve
- great auricular nerve
- lesser occipital nerve
- transverse cervical nerve
- supraclavicular nerves
lies on top of the anterior scalene m.
innervates the diaphragm
(C3, 4, & 5 keep the diaphragm alive)
(C1, 2, 3)
found on top of the internal jugular vein, or within close proximity
superior root of ansa cervicalis is from where?
from the hypoglossal nerve (C1)
inferior root of ansa cervicalis is from where?
C2 & C3
lesser occipital nerve
(what does it run with?)
runs with the lesser occipital artery
great auricular nerve
runs behind the external jugular v. on the sternocleidomastoid m.
transverse cervical n.
runs across upper part of the neck - middlish (runs horizontally)
C5 - T1
Ventral Primary Ramus
goes to upper extremeties between the anterior and middle scalene m.
ventral primary ramus of C1 - C4 usually
found thru the carotid sheath; near the common carotid a. and IJV
spinal accessory nerve
innervates the trapezius m. and the SCM
viscera of the neck:
- cervical portion of the esophagus
- thoracic duct
- thyroid gland
- parathyroid gland
- lymph nodes (100s!)
thyroid gland blood supply:
superior and inferior thyroid a./ v.
middle thyroid v.
parts of the thyroid gland
R and L lobes
pyramidal lobe (20% of ppl)
what kind of hormones does the thyroid gland secrete?
parathyroid glands regulate what?
regulate calcium ion in the blood of the body
three regions of the pharynx
parts of the nasopharynx
- pharyngeal tonsils
- torus tubaris
- pharyngotympanic tube
- salpingopharyngeal fold/ muscle
parts of the oropharynx
- palatoglossal fold
- palatopharyngeal fold
- palatine tonsils (between folds)
- soft plate
- lingual tonsils (tongue tonsils)
parts of the laryngopharynx
muscles of the pharynx
1. circular oriented muscles (pharyngeal constricter muscles: superior, middle, and inferior)
2. longitudinally oriented muscles (stylopharyngeus, salpingopharyngeus, palatopharyngeus)
3. muscles that move the soft plate (levator veli palatini, tensor veli palatini)
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