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

8. Joints

Classification of Joints

Anatomy & Physiology

8. Joints

Classification of Joints

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Problem 18

Textbook Question

Subacromial, subcoracoid, and subscapular bursae reduce friction in the____joint.
(a) hip
(b) knee
(c) elbow
(d) shoulder

Verified step by step guidance

Step 1: Begin by understanding what bursae are. Bursae are small fluid-filled sacs that reduce friction between moving structures, such as tendons, muscles, and bones, in a joint.

Step 2: Identify the specific bursae mentioned in the problem: subacromial, subcoracoid, and subscapular. These names provide clues about their anatomical location.

Step 3: Recall the anatomy of the shoulder joint. The terms 'acromial,' 'coracoid,' and 'scapular' refer to structures in the shoulder region: the acromion, coracoid process, and scapula, respectively.

Step 4: Compare the anatomical features of the other joints listed in the options (hip, knee, elbow) to confirm that these specific bursae are not associated with them.

Step 5: Conclude that the bursae mentioned in the problem are located in the shoulder joint, as they are named after structures unique to the shoulder region.

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Key Concepts

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

Bursae Function

Bursae are small, fluid-filled sacs that act as cushions between bones and soft tissues, such as muscles and tendons. Their primary function is to reduce friction and allow for smooth movement in joints, particularly during activities that involve repetitive motion.

Shoulder Anatomy

The shoulder joint, or glenohumeral joint, is a highly mobile joint that connects the upper arm bone (humerus) to the shoulder blade (scapula). It is surrounded by several bursae, including the subacromial, subcoracoid, and subscapular bursae, which help facilitate movement and reduce friction during arm motions.

Joint Types

Joints are classified into different types based on their structure and function. The shoulder joint is a ball-and-socket joint, allowing for a wide range of motion, unlike hinge joints (like the knee and elbow) that permit movement in one plane. Understanding joint types is essential for recognizing how bursae function within specific joints.

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Related Practice

Textbook Question

Match the types of joints to the descriptions that apply to them.

a. Fibrous joints

b. Cartilaginous joints

c. Synovial joints

8. Nearly all are synarthrotic

Textbook Question

Match the types of joints to the descriptions that apply to them.

a. Fibrous joints

b. Cartilaginous joints

c. Synovial joints

7. The most common type of joint in the body

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Textbook Question

Match the types of joints to the descriptions that apply to them.

a. Fibrous joints

b. Cartilaginous joints

c. Synovial joints

9. Shoulder, hip, knee, and elbow joints

Textbook Question

Compare the amount of movement possible in synarthrotic, amphiarthrotic, and diarthrotic joints. Relate these terms to the structural classification of joints—that is, to fibrous, cartilaginous, and synovial joints.

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Textbook Question

Although the knee joint is only one joint, it resembles____ separate joints.

(a) two

(b) three

(d) five

(e) six

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Textbook Question

The hip is an extremely stable joint because it has

(a) A complete bony socket

(b) A strong joint capsule