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- Infection can easily spread in it and may enter the cranial cavity via emissary veins
- Fluid and pus may accumulate here
- It is the site of extracranial haematoma (bleeding in the subaponeurotic space)
- Looseness of the connective tissue causes blood in the subaponeurotic space to track
laterally to the temporal lines, posteriorly to the superior nuchal line and anteriorly to
the upper (and to a lesser degree the lower) eyelids to give a black eye.