W20/L1 Flashcards Preview

6. Neuro > W20/L1 > Flashcards

Flashcards in W20/L1 Deck (19):
1

What are the margins of the scalp?

External occipital protuberance to supraorbital margins

Laterally between the zygomatic arches

2

What are the 5 layers of the scalp?

S: Skin
C: Connective tissue
A: Aponeurosis (of occipitalis frontalis)
L: Loose connective tissue
P: Periosteum/pericranium

3

What is contained in the 2nd layer of the scalp

Connective tissue, containing the neurovascular plane

4

What is the vasculature in the 2nd layer of the scalp

The rich anastamosis of internal & external carotid A.

5

What's unusual about the occipitalis frontalis muscle?

It's one muscle, with two bellies divided by an aponeurosis.

6

What's the action of the occipitalis frontalis?

It moves the scalp - wrinkling the forehead and raising eyebrows.

7

What are the 3 reasons scalp wounds bleed a lot?

1. Rich blood supply in the connective tissue layer

2. Scalp wounds gape - if the lacerate the anastamosis- as the muscles pull in opposite directions

3. There's fibrous septa in the connective tissue plane that attach to the sides of vessels and keep them open - they can't constrict to stem bleeding.

8

How are the layers of the face different to the layers of the scalp

The 4th layer (loose CT) is absent

The 3rd layer (aponeurosis) is replaced by the muscles of facial expression

9

Which nerve supplies the muscles of facial expression?

CN 7

Facial nerve

10

At what point does the face become the scalp?

At the level of the supraorbital margins

11

What landmark divides trigeminal nerve sensory ennervation from cervical nerve root?

The ears

12

What are the three divisions of the trigeminal nerve?

1. Opthalmic
2. Maxillary
3. Mandibular

(revise location)

13

What nerve supplies sensory ennervation to the back of the head?

C2

14

What nerve supplies sensory ennervation to the collar area of the neck?

C3

15

What dermatome does C1 supply?

None! it has no cutaneous supply

16

Where does the trigeminal nerve ganglion sit?

At the apex of the petrous part of the temporal bone

17

What part of the face is supplies by the internal carotid artery?

The centre of the forehead

18

What branches of the internal carotid supply the face?

Supraorbital & supratrochlear

19

How can you identify the facial artery

Passes over mandible

Tortuous course to the medial angle of the eye