Lab Guide 71-79 Flashcards
The thyroid cartilage is at the transverse level of which cervical vertebrae?
C4-C5
The cricoid cartilage is at the transverse level of which cervical vertebrae?
C6
Are the cutaneous nerves of the ansa cervicalis superficial or deep to the platysma?
deep
Is the investing fascia of the neck superficial or deep to the platysma?
deep
Which is anterior, the external jugular vein or the subcutaneous nerves of the nasa cervicalis?
the external jugular vein
What is the external jugular vein formed by?
the confluence of the posterior auricular v. and the posterior branch of the retromandibular v. in the substance of the parotid gland just posterior to the margin of the mandible
What are the tributaries of the external jugular vein?
the posterior external jugular v., supra scapular, and transverse cervical v.
Which is anterior, the platysma or the external and anterior jugular veins?
the platysma (both are anterior to the investing fascia of the neck)
What does the anterior jugular vein drain into inferiorly?
the EJV vein communicating veins that course deep to the SCM immediately superior to the manubrium and clavicle
What is the innervation of the anterior digastric belly?
the mylohyoid m. (branch of CN V)
Do all the strap muscles lie ventral to the thyroid gland? If not, which ones are deep?
They are ALL ventral
Does the omohyoid course superficial or deep to the SCM?
deep
The thyroid gland lies immediately deep to which muscle?
the sternothyroid
Inferiorly, which tracheal ring can the thyroid gland extend to?
the 6th
The isthmus of the thyroid gland spans which tracheal rings?
2-4
The pyramidal lobe of the thyroid (if present) typically extends from which lobe?
the left
What structures are medial to the thyroid gland?
the trachea and recurrent laryngeal nerves
What structures are immediately lateral to the thyroid gland?
the carotid sheath
The superior and middle thyroid veins drain to where?
the internal jugular vein
The inferior thyroid veins drain to where?
the brachiocephalic veins
Which cranial nerves can be found in the carotid triangle?
vagus and hypoglossal
What muscle splits to insert on the hyoid bone around the posterior digastric belly?
the stylohyoid m.
What ventral rami fibers contribute to the superior root of the ansa cervicalis?
C1
The hypoglossal nerve crosses posterior to the belly of what?
the posterior digastric
In the carotid triangle, the hypoglossal nerve loops inferior to which artery?
the SCM branch of the occipital a.
Describe the course of the hypoglossal n.
It descend into the carotid triangle and loops inferior to a branch of the occipital a., then crosses the lateral surface of the external carotid a. superficially at the origin of the lingual a. then cross the greater horn of the hyoid bone to enter the submandibular triangle
What ventral rami fibers contribute to the inferior root of the ansa cervicalis?
C2-C3