So the cervical nerve, cervical plexus - C1,
C2, C3, C4 supplies everything else in the
head and neck region mainly the muscles and
the sensation of the neck. Okay,
now if you take your mandible and correspond that
to a cervical vertebra; if you’re looking
at a CT scan, transverse level, what cervical
vertebra will that correspond to? Mandible,
the mental prominence?
Oh that’s too low. No, go down.
Okay, it’s C2.So if you look at C-spine x-ray
the hard palate corresponds to the atlas
or the C1. Hard palate is C1. Next is the
mental prominence, that is C2, then you come
down. The next bony prominence, what can you
feel in your neck? What’s the next thing
you feel? Hyoid bone; that corresponds to
C3. Then you come down, what do you feel next?
Thyroid cartilage? Thyroid cartilage.
What’s the vertebral
level of that? C4. Okay, let’s stop at thyroid
cartilage. So that’s the thyroid cartilage.
What are the anatomical significance at that
point? Thyroid cartilage, at this level?
Bifurcation of the carotids?
Bifurcation of the carotids; that’s one
of the most important thing. Anything else?
Okay. For the purpose of this exam if you
remember bifcurcation of the carotid, that’s
good enough. You also have the superior ganglion,
superior sympathetic ganglion at the C4
level, but bifcurcation of the carotid is fine.
Then you come down in the midline, next
you feel the thyroid notch, a small notch
you feel, then you feel a membrane, so
that's your cricothyroid membrane, C5. Then
you come to the cricoid cartilage, that’s
C6. Then you have the tracheal rings, 2, 3,
and 4 tracheal rings. So those are your midline
structures. What are other structures
in the midline? You have the strap muscles.
What are the strap muscles in the neck?