What is the name of the bone in the human thigh?
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A
Ulna
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B
Femur
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C
Radius
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D
Humerus
The bone in the human thigh is called the femur.
The thigh is the anatomical region between the hip and the knee, and it contains a single long bone that supports body weight, enables movement, and connects the pelvis to the lower leg. This bone is the femur, which is the largest and strongest bone in the human skeleton.
A) Ulna
The ulna is one of the two long bones of the forearm and is located on the medial side, closest to the little finger.
It articulates with the humerus at the elbow and with the radius at the wrist, forming part of the upper limb skeleton. The ulna plays no role in the structure or movement of the lower limb and is not found in the thigh region. Therefore, this option is incorrect.
B) Femur
The femur is the bone of the thigh and is the longest, strongest, and heaviest bone in the human body.
It extends from the hip joint, where its rounded head fits into the acetabulum of the pelvis, to the knee joint, where its condyles articulate with the tibia and patella. The femur supports body weight during standing, walking, and running and serves as the attachment point for powerful muscles of the hip and thigh.
Because the thigh is defined as the region between the hip and knee and contains the femur, this option is correct.
C) Radius
The radius is the lateral bone of the forearm, located on the thumb side.
It articulates with the humerus at the elbow and the carpal bones at the wrist and is involved in movements such as pronation and supination of the hand. It is part of the upper limb and has no anatomical connection to the thigh or lower extremity. Therefore, this option is incorrect.
D) Humerus
The humerus is the long bone of the upper arm, extending from the shoulder to the elbow.
It articulates with the scapula at the shoulder joint and with the radius and ulna at the elbow joint. Although it is similar in shape to the femur as a long bone, it belongs to the upper limb, not the lower limb, and is not found in the thigh. This option is incorrect.
Conclusion:
The thigh is the upper portion of the lower limb between the hip and the knee and contains a single major bone responsible for weight-bearing and movement. The ulna, radius, and humerus are bones of the upper limb, whereas the femur is the bone of the thigh.
- Therefore, the correct answer is the femur.

Topic Flashcards
Click to FlipWhat is the name of the rounded head of the femur that fits into the acetabulum to form the hip joint?
The femoral head.
What are the two large, bony projections on the proximal femur that serve as major muscle attachment sites?
The greater trochanter and the lesser trochanter.
What is the name of the shallow depression on the femoral head where the ligament of the head of the femur (ligamentum teres) attaches?
The fovea capitis.
What is the anatomical term for the distal end of the femur where it articulates with the tibia to form the knee joint?
The femoral condyles (medial and lateral condyles).
What is the common name for the surgical procedure that replaces a damaged hip joint with an artificial implant?
Total hip arthroplasty (or hip replacement).