Dermatomes of the Head

00:01 Now let's take a look at the dermatomes of the head.

00:05 We'll start by looking at the facial aspect of the head.

00:09 Superiorly, down over the eyes, end of the bridge of the nose, we have dermatome innervation provided by the ophthalmic nerve.

00:18 Just below that, coming over the cheeks to the upper lip, we have innervation provided by the maxillary nerve.

00:27 Then finally below that, going over the jaw, we have the mandibular nerve.

00:32 And so together, these are the three divisions of the trigeminal nerve.

00:37 V1, V2 And V3.

00:41 However, the posterior aspect of the head is going to be innervated by cervical spinal nerves.

00:48 So we'll swing around to a posterior view to see those dermatomes.

00:53 We start superiorly with C2 and C3, C4, and C5.

01:00 And you might be wondering, where's the dermatome provided by C1 and it turns out that C1 doesn't provide any dermatome innervation.

01:08 C1 is actually motor nerve only.

01:11 So it only innervates muscles and doesn't provide any sensation.