Scalp and Face

Which artery supplies the superficial tissues of the scalp and anastomoses extensively with branches of the opposite side?

The sensory innervation of the scalp anterior to the vertex is primarily supplied by which nerve?

A 34-year-old man presents to the emergency department after a stab wound to the left temple region. On examination, there is active bleeding from the wound, and the patient reports severe pain. The wound is located anterior to the ear, between the zygomatic arch and the superior temporal line. Which of the following arteries is most likely to be injured and responsible for the brisk hemorrhage?

A 28-year-old woman presents with a 3-day history of progressive facial swelling and pain in the left cheek. On examination, there is marked edema of the left face with a fluctuant mass palpable over the left cheek anterior to the masseter muscle. The patient has a history of poor dental hygiene and a recent left lower molar extraction. Intraoral examination reveals purulent drainage from the extraction socket. Which anatomical space is most likely involved, and what is the primary route of spread of infection in this case?