Temporal artery biopsy

Why do we take so much:
giant cell arthritis has "skip lesions." Sensitivity increases with longer biopsy.

Why is diagnosis so important:
Risk of blindness with ophthalmic artery occlusion. Steroids are not benign.

carotid endarterectomy

what is the first muscle layer and what is its function:
Platysma and facial expression
What animal has the biggest platysma:
Horse
What is the first branch of the external carotid
superior thyroid.
Why is it ok to occlude one internal carotid.
Circle of Willis gets blood to the contralateral brain.