Term
| In the scalp, the anterior part is supplied by which nerve? the posterior? |
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Definition
the anterior is supplied by the trigeminal N (CN V) CN V1 supratrochlear N CN V1 supraorbital N CN V2 zygomaticotemporal N CN V3 auriculotemporal N the posterior is supplied by the cervical plexus, C2-C3 C2 great occipital N C3 third occipital N C2,C3 lesser occipital N |
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Term
| why does a person get a black eye when they endure trauma to forehead? |
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Definition
| fluid collects behind the frontalis muscle and since there's no bony attachment, fluid seeps down and collects behind eye and eyelid. |
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Term
| which layer of the scalp is the dangerous layer? |
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Definition
| the loose areolar tissue layer because of the presence of emissary veins, which drain into the dural and cavernous sinuses- osteomyelitis and acute meningitis |
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Term
| why are infections of the scalp painful and localized? |
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Definition
| because of the dense fibrous layer in subcutaneous tissue |
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Term
| Where are two places an infection of the scalp cannot spread to? |
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Definition
| the neck and temples because the occipitalis muscle is attached there |
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Term
| what is the embryological origin of the facial muscles? and what is the embryological origin of the nerve which supplies the facial muscles? |
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Definition
| the facial muscles develop from the pharyngeal arches and they are innervated by the facial N (CN 7) which derives from the 2nd pharyngeal arch. The muscles of facial expression are also derived from the 2nd pharyngeal arch. |
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