Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

7. The Skeletal System

Bones of the Upper Limb

Anatomy & Physiology

7. The Skeletal System

Bones of the Upper Limb

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1:41 minutes

Problem 9

Textbook Question

Which bone of the arm corresponds to the femur of the leg?
a. Ulna
b. Humerus
c. Radius
d. Tibia
e. Fibula

Verified step by step guidance

Understand the question: The problem is asking which bone in the arm corresponds to the femur in the leg. The femur is the largest and strongest bone in the leg, located in the thigh, and serves as the primary bone for muscle attachment and weight-bearing. We need to identify the arm bone that has a similar function and anatomical position.

Review the anatomy of the arm: The arm contains three main bones: the humerus (upper arm bone), the radius (forearm bone on the thumb side), and the ulna (forearm bone on the pinky side). The humerus is the largest and strongest bone in the arm, connecting the shoulder to the elbow.

Compare the femur and humerus: Both the femur and humerus are long bones that serve as the primary structural support for their respective limbs. They articulate with other bones to form joints (the femur with the pelvis and tibia, and the humerus with the scapula and radius/ulna). Additionally, both bones are sites for muscle attachment and play a role in movement.

Eliminate incorrect options: The ulna and radius are forearm bones and do not correspond to the femur in terms of size, function, or anatomical position. Similarly, the tibia and fibula are bones of the lower leg and are not part of the arm.

Conclude the correct answer: Based on the comparison, the humerus is the arm bone that corresponds to the femur of the leg due to its size, function, and anatomical position.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Homologous Structures

Homologous structures are anatomical features in different species that share a common ancestry, even if they serve different functions. In this context, the femur in the leg and the humerus in the arm are homologous, as they are both long bones that support limb structure and movement.

Bone Classification

Bones are classified into several categories based on their shape and function, including long, short, flat, and irregular bones. The femur and humerus are both classified as long bones, characterized by a greater length than width, which allows for leverage and movement in limbs.

Anatomical Position

The anatomical position is a standardized way of observing or imaging the body that allows for clear communication of anatomical structures. In this position, the body is standing upright, facing forward, with arms at the sides and palms facing forward, which helps in understanding the relationship between different bones in the arm and leg.

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Related Practice

Textbook Question

The 'elbow bone' is called the:

a. Trochlea

b. Capitulum

c. Olecranon

d. Deltoid tuberosity

The only bone of the arm is the _______. The forearm consists of the medial ______and the lateral_____.

Which of the following is not a proximal carpal bone?

a. Hamate

b. Pisiform

c. Scaphoid

d. Lunate

Why would a physician be concerned about the growth patterns of a young child request an x-ray of the hand?

The point of the elbow is actually the _____ of the ulna.

(a) Styloid process

(b) Olecranon

(d) Trochlear notch

The bones of the hand articulate distally with the:

(a) Carpal bones

(b) Ulna and radius

(d) Phalanges

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Textbook Question

At the glenoid cavity, the scapula articulates with the proximal end of the (a) humerus, (b) radius, (c) ulna, (d) femur.

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Textbook Question

Jack injures himself playing hockey, and the physician who examines him informs him that he has dislocated his pollex. What part of Jack's body did he injure?

(a) his arm

(b) his leg

(d) his thumb

(e) his shoulder.

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