QuestionSBA
QuestionChoice
Incorrect. The sympathetic chains lie lateral to vertebral bodies at the posterior thoracic wall on the necks of ribs bilaterally, derived from the sympathetic outflow of T1-L2.
10009079
e
Sympathetic chain
QuestionChoice
Correct. The phrenic nerve arises form the anterior primary rami of C3,4,5 ('C3-5 keep the diaphragm alive'). It lies under the prevertebral fascia on the anterior surface of the scalenus anterior muscle, passing between the subclavian artery and vein. It is always found lateral to the vagus nerve on each side.
10009075
a
Phrenic nerve
QuestionChoice
Incorrect. The spinal accessory nerves emerge laterally from the spinal cord from the ventral horns of the C1-5 spinal roots. They emerge a third of the way down the posterior border of sternocleidomastoid bilaterally to supply it on each side, then pass lateral to the transverse processes of the cervical vertebrae. They then cross the posterior triangle to supply trapezius on each side.
10009078
d
Spinal accessory nerve
QuestionChoice
Incorrect. The superior laryngeal nerves are branches of the vagus nerve at the level of C2 on each side. They descend towards the larynx bilaterally and give off internal (sensory) and external (motor) branches in the neck.
10009077
c
Superior laryngeal nerve
QuestionChoice
Incorrect. The recurrent laryngeal nerves are branches of the vagus nerve in the thorax on each side. The left recurrent laryngeal nerve arises at the level of the aortic arch and winds around the ligamentum arteriosum before ascending to the larynx, medial to the left phrenic nerve. The right recurrent laryngeal nerve arises at the level of the right subclavian artery and also ascends to the larynx, medial to the right phrenic nerve.
10009076
b
Recurrent laryngeal nerve
Concept
Chapter
2693
5305
Phrenic nerve
Topic
201
Head and neck anatomy
14362
Picture
1722
17 - Phrenic nerve (left).png
images/ip6d6sik1682950595993.jpg
images/ip6d6sik1682950595993_256.jpg
images/ip6d6sik1682950595993_512.jpg
ZTkODYKYeXh/ioh7eIeHiA2CwTIH
Topic
201
Head and neck anatomy
Identify the labelled structure.

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a