MCA arises from internal carotid artery and supplies lateral cerebral cortex. Divides into four segments: sphenoidal, insular, opercular, and cortical. Supplies anterior temporal lobes and insular cortices. Connects to anterior cerebral arteries and posterior communicating arteries
Factor X is a serine endopeptidase encoded by F10 gene. Synthesized in liver and requires vitamin K. Half-life is 40-45 hours. Active site divided into four subpockets
Axillary lymph nodes are located in the armpit, containing 20-49 nodes. They drain lymph from breast, chest, abdomen, and upper limb. About 75% of breast lymph drains into these nodes
Ectoderm is the outermost germ layer in early embryonic development. Derives from outer germ cells and differentiates into epithelial and neural tissues. Divided into dorsal surface ectoderm and neural plate in vertebrates. Forms from animal hemisphere during gastrulation process
Vocal cords are horizontal folds of mucous membrane in larynx. True vocal cords are delicate, false folds produce deep tones. Adult vocal cords are 12-24mm long and 3-5mm thick. Vocal folds are attached to arytenoid and thyroid cartilages
Internal jugular vein collects blood from brain and neck to right atrium. Vein has three layers: adventitia, media, and intima. Originates from skull's jugular foramen and runs vertically in carotid sheath. Left jugular vein is generally smaller than right