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ESA 4 - Head and Neck > Scalp > Flashcards

Scalp Flashcards

1
Q

How many layers does the scalp consist of?

A

Five

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2
Q

Which of the layers of the scalp are tightly bound together?

A

The first three

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3
Q

What is the result of the first three layers of the scalp being tightly bound together?

A

They move as a unit

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4
Q

What are the layers of the scalp?

A
  • Skin
  • Dense connective tissue
  • Epicranial aponeurosis
  • Loose areolar connective tissue
  • Periosteum
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5
Q

What does the skin layer of the scalp contain?

A
  • Numerous hair follicles
  • Sebaceous glands
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6
Q

What is the skin of the scalp a common site for?

A

Sebaceous cysts

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7
Q

What does the dense connective tissue in the scalp do?

A

Connects skin to epicranial aponeurosis

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8
Q

What is true of the blood and nerve supply of the dense connective tissue of the scalp?

A
  • Richly vascularised and innervated
  • Blood vessels within the layer are highly adherent to connective tissue
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9
Q

What is the result of the blood vessels in the dense connective tissue of the scalp being highly adherent to connective tissue?

A

Renders them unable to constrict fully if lacerated, and therefore scalp can be a site of profuse bleeding

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10
Q

What is the epicranial aponeurosis of the scalp?

A

Thin, tendon-like structure

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11
Q

What does the epicranial aponeurosis of the scalp do?

A

Connects occipitalis and frontalis muscles

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12
Q

What is the loose arerolar connective tissue layer of the scalp?

A

Thin connective tissue layer that seperates the periosteum of skull from epicranial aponeurosis

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13
Q

What does the loose areolar connective tissue of scalp contain?

A

Numerous blood vessels

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14
Q

What clinically important blood vessels does the loose areolar connective tissue of the scalp contain?

A

Emissary veins

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15
Q

What do the emissary veins do?

A

Connect the veins of the scalp to the diploic veins and intracranial venous sinuses

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16
Q

What is the loose areolar connective tissue of the scalp known as?

A

The danger area of the scalp

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17
Q

Why is the loose areolar connective tissue of the scalp known as the danger area of the scalp?

A

Because pus and blood can easily spread within it, and can pass along the cranial cavity along emissary veins

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18
Q

Where can infection spread from the scalp?

A

The meninges, causing meningitis

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19
Q

What is the periosteum of the scalp?

A

Outer layer of skull bones

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20
Q

What does the periosteum become continuous with?

A

Endosteum

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21
Q

Where does periosteum become continuous with endosteum?

A

Suture lines

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22
Q

Where do blood vessels supplying the scalp arise from?

A

Branches of the internal and external carotid arteries

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23
Q

Via what do the internal cartoid arteries supply the scalp?

A

Via the branch, the opthalmic artery

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24
Q

Where does the opthalmic artery supply the scalp?

A

Anteriorly

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25
Via what does the opthalmic artery supply the scalp?
Two branches; * Supraorbital artery * Supratrochlear artery
26
What do the supraorbiral and supratrochlear artery accompany?
The supraorbital and supratrochlear nerves respectively
27
Via what does the external carotid artery supply the scalp?
* Superficial temporal * Posterior auricular * Occipital
28
What does the superficial temporal artery supply?
Frontal and temporal regions
29
What does the posterior auricular artery supply?
The area superior and posterior to auricle
30
What does the occipital artery supply?
Back of scalp
31
What provides a rich blood supply to the tissues of the scalp?
Anastomoses
32
What is the clinical relevance of the anastomoses supplying the scalp?
Scalp wounds often bleed heavily
33
What can the venous drainage of the scalp be divided into?
Superficial and deep components
34
What arteries does the superficial drainage of the scalp follow?
* Superficial * Occipital * Posterior auricular * Supraorbital * Supratrochlear ## Footnote *Note: Veins are named after their respective arteries*
35
What is the deep (temporal) region of the skull drained by?
Pterygoid venous plexus
36
What is the pterygoid venous plexus?
A large plexus of veins
37
Where is the pterygoid venous plexus situated?
Between temporalis and lateral pterygoid muscles
38
What does the pterygoid venous plexus drain into?
The maxillary vein
39
What do the veins of the scalp connect to?
The diploic veins
40
How do the veins of the scalp connect to the the diploic veins of the skull?
Via valveless emissary veins
41
What does the connection of the veins of the scalp and the diploic veins of the skull establish?
Connection between scalp and dural venous sinuses
42
How does the scalp recieve its cutaneous innervation?
Six main nerves
43
What do the main nerves of the scalp arise from?
The trigeminal or cervical nerves
44
What does the trigeminal nerve give rise to?
* Supratrochlear nerve * Supraorbital nerve * Zygomaticotemporal nerve * Auriculotemporal nerve
45
What is the supratrochlear nerve a branch of?
Opthalamic nerve
46
What does the supratrochlear nerve supply?
Anteromedial forehead
47
What is the zygomaticotemporal nerve a branch of?
Maxillary nerve
48
What does the zygomaticotemporal nerve supply?
Temple
49
What is the auriculotemporal nerve a branch of?
Mandibular nerve
50
What does the auriculotemporal nerve supply?
Skin anterosuperior to auricle
51
What does the cervical nerve give rise to?
* Lesser occipital nerve * Greater occipital nerve
52
What is the lesser occipital nerve a branch of?
The anterior rami of C2 and 3
53
Where does the lesser occipital nerve supply?
Behind the ear
54
What is the greater occipital nerve a branch of?
Anterior rami of C2 and C3
55
Where does the greater occipital nerve supply
Posterior scalp up to vertex
56
What is the problem with deep lacerations of the scalp?
They tend to blled profusely
57
Why do deep lacerations of the scalp tend to bleed profusely?
* Pull of occipitofrontalis muscle prevents closure to bleeding vessel and surrounding skin * Blood supply of scalp made up of many anastomoses, which contribute to produse bleeding * The blood vessels of the scalp are connective to dense connective tissue
58
Why does the blood vessels of the scalp being connected to dense connective tissue lead to deep lacerations bleeding profusely?
Prevents vasoconstriction that normally occurs in response to damage
59
Does loss of blood supply to scalp lead to bone necrosis?
No
60
Why does loss of blood supply to the scalp not lead to bone necrosis?
Because most of the blood supply to scalp comes from middle meningeal artery
61
Label this diagram of the layers of the scalp ## Footnote *Add diagram with labels*
* A - Skin and dense connective tissue * B - Epicranial aponeurosis * C - Loose arerolar connective tissue * D - Periosteum

ESA 4 - Head and Neck (30 decks)

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