Head & Neck Anatomy and Imaging

Question 1

List 5 muscles that insert onto the mastoid tip (and their innervations)

Answer 1

1. SCM (CNXI)
2. Posterior belly of digastric (CNVII)
3. Longissimus capitis (posterior spinal nerve)
4. Splenius capitis (C3-C4)
5. Posterior auricular muscles

Question 2

What is the blood supply to the SCM?

Answer 2

Superior - Occipital
Middle - Superior thyroid
Inferior - Transverse Cervical

Question 3

What is the innervation to the platysma?

Answer 3

Cervical branch of the facial nerve