01 / Location & anatomical relationships
Inside the thigh, between hip and knee.
02 / Structure & organization
The femur has a proximal head and neck, trochanters for muscle attachment, a shaft and distal condyles. Its head articulates with the acetabulum, while the distal end participates in the knee.
03 / Function
It is the longest bone in the human body.
04 / Mechanism
The rounded upper end fits into the hip socket, while the lower end meets the tibia at the knee. A strong outer layer surrounds inner bone tissue and marrow. Muscle attachments make it a lever for walking.
Working together: skeletal system
Bones provide a framework. Muscles pull on them through tendons, and joints allow movement.
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Connect structure with function
The angle between shaft and neck directs weight transfer from pelvis to knee. Distal geometry supports both tibiofemoral movement and patellar tracking.
Check your understanding
Locate the femur in relation to its neighbors. Explain how the structural features described above support its function, then distinguish it from a nearby structure with a different role.
Keep learning
Continue with OpenStax Anatomy and Physiology for system-level study. This atlas is educational and has not undergone independent medical peer review.