5 Questions
Up to which anatomical landmark does the scalp extend posteriorly?
The superior nuchal lines
What is the significance of the scalp's skin being firmly adherent to the epicranial aponeurosis?
It allows the skin to be firmly attached to the underlying aponeurosis, similar to the palms and soles
What is the estimated number of hair on the scalp of an adult individual?
1,20,000
What is the primary cause of baldness, according to the text?
High level of androgenic hormones in the blood
What is the mnemonic device used to remember the layers of the scalp?
SCALP
Study Notes
Scalp Location and Extent
- Extends anteriorly up to the eyebrows (superciliary arches)
- Extends posteriorly up to the superior nuchal lines
- Extends laterally on each side up to superior temporal line
- Some authorities believe it extends laterally on each side up to the zygomatic arch
Layers of the Scalp
- Consists of five layers from superficial to deep
- The layers are: skin, connective tissue (superficial fascia), aponeurosis (occipitofrontalis muscle and its aponeurosis), loose areolar tissue, and pericranium
Skin Layer
- Thick and hairy except over the forehead
- Firmly adherent to epicranial aponeurosis by dense connective tissue of superficial fascia
- Has maximum number of hair follicles and associated sebaceous glands
- Commonest site of sebaceous cysts
- Contains numerous sweat glands
Hair Facts
- Estimated 1,20,000 hair on the scalp of an adult individual
- 20-100 hair are lost daily and replaced concomitantly
- Baldness (loss of hair) mainly affects males and few elderly females with high level of androgenic hormones in their blood
Learn about the structure and layers of the scalp, including its boundaries and components. Identify the different layers of the scalp, from skin to aponeurosis.
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