W1: S2 - Scalp Flashcards
Where does the scalp extend to anteriorly?
Supraorbital margin
Where is the superior nunchal line?
Occipital Bone beside external occipital proturbance
Where does the scalp extend to posteriorly?
Superior nuchal lines
Where does the scalp extend to laterally?
Zygomatic arch
Which bone is the superior nuchal line a part of?
Occipital
What are the 5 layers of the scalp? SCALP mnemonic
- Skin
- Cutaneous tissue (dense connective tissue)
- Aponeurosis of Occipitofrontalis
- Loose connective tissue
- Periosteum (pericranium)
What is the action of contraction of the frontal belly and posterior belly of the occipitofrontalis?
- Anterior belly - Raising eyebrows and wrinkling forehead
- Posterior belly - Pulls scalp back posteriorly
What is the anterior source of cutaneous innervation of the scalp?
CN V - Trigeminal
What supplies the posterior half of the scalp with cutaneous innervation?
- Anterior and posterior rami of cervical spinal nerves
- C2 and C3
What is the cutaneous innervation of the scalp?
Does C1 have any dermatomal innervation?
Almost none
How does herpes zoster present?
The virus travels down nerves in a dermatomal fashion and presents as skin lesions in the dermatome
In which layer of the scalp do blood vessels that supply it run?
Cutaneous tissue
Why do wounds to the scalp bleed profusely?
No vasoconstriction can occur due to the dense connective tissue retracting
What are the branches of the External Carotid Artery?
Some American Ladies Find Our Pyramids So Magnificent
- S - Superior Thyroid
- A - Ascending Pharyngeal
- L - Lingual
- F - Facial
- O - Occipital
- P - Posterior Auricular
- S - Maxillary
- M - Superficial Temporal
Try learn a few of these
What veins pass through diploe?
Emissary veins
Explain the arterial supply of the scalp and whether they branch from the ICA or ECA.
- Internal
- Supretrochlear
- Supra-orbital
- External
- Superficial Temporal
- Posterior Auricular
- Occipital
