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Hair is a defining feature of human anatomy, originating from hair follicles that are embedded within the skin's layers, starting in the epidermis. These follicles are complex structures with multiple components that work together to support hair growth, protection, and sensory functions. This article provides an in-depth look at the anatomical structure of hair, focusing on a detailed diagram that labels each part of the hair follicle. By understanding the roles of these components, we gain insight into hair growth cycles, their physical characteristics, and their significance in overall skin health.

This comprehensive illustration depicts both the macroscopic organization of the lymphatic system throughout the human body and the detailed microscopic structure of a lymph node, including a pathological view showing tumor infiltration. Understanding the lymphatic system is crucial for medical professionals across disciplines, from immunologists studying immune responses to oncologists tracking cancer metastasis.

Lymph nodes serve as crucial filtration stations within the lymphatic system, playing a vital role in immune surveillance and response. This cross-sectional image provides an excellent view of a lymph node's internal architecture, showcasing its specialized compartments and cellular organization.