| Question |
Answer |
| Q At what vertebral level is the cricoid cartilage almost always found?*** |
A C6*** |
| Q At what vert level is the jugular notch? |
A T3 |
| Q what is found between the cricoid cartilage and the laryngeal prominence? |
A a soft spot |
| Q What m divides the lat neck into ant/pos triangles? |
A SCM |
| Q There are two fossae created by the heads of the SCM m.. What are these called, and where do they lie? |
A The greater lies laterally, and the lesser lies between the two heads. Both of these are at the clavicular end of the m. |
| Q Where is the hyoid bone in relation to the larynx? |
A superior |
| Q What happens to the platysma m. at the chin? |
A It decussates, or crosses |
| Q What is the innervation and blood supply to the platysma m.? |
A The cervical (most inf) branch of CN7/facial, and the facial artery. |
| Q What is the action of the platysma m.? |
A mainly to depress the mandible |
| Q What is the innervation of the SCM? |
A CN XI, spinal accessory. Remember, this is only motor. Also, C2-3 for pain/proprioception |
| Q What is the action of the SCM, according to THIS class? |
A singularly, it tilts the head laterally and turns the face superiorly and to the opp side. SCM's together will flex neck and thrust the chin |
| Q What are the ant/pos/inf borders of the pos triangle of the neck? |
A ant = SCM, pos = traps, inf = mid 1/3 clavicle/greater supraclavicular fossa |
| Q What are the mm. that form the floor of the pos triangle of the neck? |
A from sup to inf = splenius capitis, levator scap, pos/med/ant scalenes |
| Q How is the pos triangle further divided into two triangles? What are the names of these? |
A By the omohyoid m. which passes superficial to the floor mm. The sup triangle = occipital triangle, and the inf = suprascapular/clavicular triangle |
| Q What triangle is the external jugular vein found in? *** |
A It is actually formed in the ant triangle, but passes over the SCM into the pos triangle on its descent. IF you have to pick one, go with the POS triangle*** |
| Q The first part of the subclavian a. ascends to the ant scalene m., then becomes the second part as it passes between the ant/mid scalene. Where is the 3rd part of the subclavian a.? |
A it is found along the base of the pos triangle. It extends from the lat border of the ant. scalene down to the first rib. |
| Q We already know that the xverse C a. supplies blood to some back mm., but what a. does this branch from, and what other branches may be found off of this same a? |
A The thyroid a., the xverse C, and the suprascapular aa. all branch off of the thyrocervical trunk. |
| Q What divides the pos triangle into carefree/carefull areas? |
A CNXI, spinal accessory. This exits deep to SCM, and passes laterally across pos triangle to the traps. Above is carefree, below is carefull b/c so many nn. are present. |
| Q The ansa cervicalis has two deep branches, called sup/inf roots. What do these roots innervate? |
A the ansa cervicalis gives motor to the mm. of the ant triangle of the neck. |
| Q Where is the "n. point" found on the neck? |
A mid belly of SCM, pos. aspect. This is where you will find the cervical plexus prior to arborization |
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