What is the cervical plexus formed by?
The cervical plexus is formed from the anterior primary rami of C1–C4, deep to the sternocleidomastoid muscle and in front of the scalenus medius and levator scapulae muscles.
What is the origin of the levator scapulae?
The levator scapulae originates on the posterior tubercle of transverse process of cervical vertebrae 1 to 4.
Where does the recurrent laryngeal nerve come from?
The recurrent laryngeal nerve (RLN) is derived from the vagus trunk as it enters the thorax. The left RLN curves below and behind the aortic arch at the level of the ligamentum arteriosum. The right RLN loops under the subclavian artery.
What is the origin insertion and action of levator scapulae?
Functionally, however, it is considered to be a muscle of scapular motion along with the rhomboids, serratus anterior, serratus posterior superior and inferior muscles….Levator scapulae muscle.
| Origin | Transverse processes of vertebrae C1-C4 |
|---|---|
| Insertion | Medial border of scapula (from superior angle to root of spine of scapula) |
What is the origin of the levator scapulae quizlet?
The origin of the levator scapulae muscle is the spinous processes of the upper four cervical vertebrae (C1-4). The medial border of the scapula above the scapular spine is the insertion point of the levator scapulae.
Which of the following nerves originates in the lumbosacral plexus?
The nerve that originates in the lumbosacral plexus is the sciatic nerve (letter B).
Where does vagus nerve originate?
The vagus nerve arises from the fourth branchial arch; this arch is also responsible for the development of the pharyngeal and laryngeal muscles, the laryngeal cartilages, the aortic arch, and subclavian artery.
Where does inferior laryngeal nerve come from?
The recurrent laryngeal nerve (RLN), also known as the inferior laryngeal nerve, is a branch of the vagus nerve (CN X) which has a characteristic loop around the right subclavian artery on the right and the aortic arch on the left before returning up to achieve the tracheoesophageal groove and then the larynx.
What is the origin of the thyrohyoid?
Thyrohyoid muscle
| Origin | Oblique line of thyroid cartilage |
|---|---|
| Insertion | Inferior border of body and greater horn of hyoid bone |
| Action | Depresses hyoid bone Elevates larynx |
| Innervation | Anterior ramus of spinal nerve C1 via hypoglossal nerve (CN XII) |
| Blood supply | Branches of lingual and superior thyroid arteries |
Is the cervical plexus sympathetic or parasympathetic?
These communicating fibres are the contributions from the sympathetic trunk (sympathetic nervous system) to the cervical plexus and are known as the “gray rami” communicantes (meaning blood vessel accompanied). They descend from the superior cervical ganglion (which is the largest of the three cervical ganglia).
How is lumbosacral plexus formed?
The lumbosacral plexus is formed by ventral rami of the lumbar and sacral nerves, T12 through S4. The lumbar part is formed by roots from T12 to L4 and the sacral component by L4–S4 roots. These divide into anterior and posterior divisions, which give rise to anterior and posterior branches, respectively.
How is the ansa cervicalis formed?
The ansa cervicalis is formed by two roots, superior and inferior, which are formed by the fibers from the anterior rami of the cervical spinal nerves . The superior root is in close anatomical relationship with the hypoglossal nerve (CN XII) , which is why it has been thought for a long time that it emerges from the hypoglossal nerve itself.
What is the role of the ansa cervicalis in laryngeal reinnervation?
The ansa cervicalis is an attractive and useful candidate for laryngeal reinnervation in cases of recurrent laryngeal nerve paralysis (RLNP) [ 46 ]. RLNP is one of the most serious complications in esophageal cancer surgery.
Is the ansa cervicalis efferent or afferent?
The ansa cervicalis is considered an efferent nerve; however, there may be an afferent neural component to the infrahyoid muscles during phonation and deglutition [ 6 ].
What is the inferior root of the ansa cervicalis?
The inferior root of the ansa cervicalis, also known as descendens cervicalis, is formed by fibers from spinal nerves C2 and C3 . The inferior root gives off branches to the inferior belly of the omohyoid muscle, and the lower parts of the sternothyroid and sternohyoid muscles.