Clinical anatomy/clinical questions : head and neck: scalp : Why a blow on head may cause ‘Black Eye”-explain anatomically?

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Why a blow on head may cause ‘Black Eye”-explain anatomically?

A  blow on head leads to collection of blood in the 4^th layer  (loose areolar tissue) of scalp. The blood from this layer may gravitate into the eyelids because the frontalis muscle has no bony attachment. This leads to formation of hematoma and black discoloration of skin around the eyes few hours after the head injury resulting in a condition called ‘black eye’. The blood cannot pass laterally or posteriorly due to the attachment of  epicranial aponeurosis and occipitalis muscle to the superficial temporal lines and superior nuchal lines respectively.