$$\text{Number of axes} = 1$$ for hinge and pivot joints

$$\text{Mobility} \propto \frac{1}{\text{Stability}}$$

Question 1

Which of the following best describes a synarthrosis joint?

Accepted Answer

An immovable joint, such as a suture in the skull

Question 2

A patient presents with limited movement between the tibia and fibula. Which type of joint is most likely involved?

Accepted Answer

Syndesmosis

Question 3

Which structural classification of joints is characterized by bones joined by dense fibrous connective tissue and lacks a joint cavity?

Accepted Answer

Fibrous joints

Question 4

Which joint type allows the greatest range of motion and is found in the shoulder and hip?

Accepted Answer

Ball-and-socket joint

Question 5

What is the primary function of synovial fluid within a joint cavity?

Accepted Answer

To lubricate and nourish articular cartilage

Question 6

Which of the following movements describes decreasing the angle between two bones along the sagittal plane?

Accepted Answer

Flexion

Question 7

A dentist is concerned about the health of the periodontal ligament. Which joint type is being examined?

Accepted Answer

Gomphosis

Question 8

Which of the following is NOT a feature of synovial joints?

Accepted Answer

Epiphyseal plate

Question 9

Which ligament prevents anterior displacement of the tibia relative to the femur in the knee joint?

Accepted Answer

Anterior cruciate ligament

Question 10

A football player suffers a shoulder dislocation. Which anatomical feature most likely contributed to the injury?

Accepted Answer

Weak glenohumeral ligaments

Question 11

Which type of synovial joint allows movement in two planes and is found in the metacarpophalangeal (knuckle) joints?

Accepted Answer

Condylar joint

Question 12

Which movement involves turning the sole of the foot medially?

Accepted Answer

Inversion

Question 13

During chewing, the temporomandibular joint (TMJ) allows which two types of movement?

Accepted Answer

Depression/elevation and lateral excursion

Question 14

Which equation best represents the relationship between the number of axes of movement and the type of synovial joint?

Accepted Answer

$$	ext{Number of axes} = 1$$ for hinge and pivot joints

Question 15

Which structure in the knee joint acts to improve the fit of bone ends, stabilize the joint, and reduce wear and tear?

Accepted Answer

Meniscus (articular disc)

Question 16

A patient with a torn rotator cuff will most likely experience instability in which joint?

Accepted Answer

Shoulder (glenohumeral) joint

Question 17

Which of the following best explains why the hip joint is less likely to dislocate than the shoulder joint?

Accepted Answer

The hip joint is reinforced by a deep acetabular labrum and strong ligaments

Question 18

Which movement is described by the thumb touching the tips of the other fingers?

Accepted Answer

Opposition

Question 19

Which of the following is a multi-step process that occurs when a muscle contracts to move a bone at a synovial joint?

Accepted Answer

Insertion moves toward origin, causing movement along a specific plane

Question 20

Which equation correctly represents the relationship between joint mobility and stability?

Accepted Answer

$$	ext{Mobility} \propto \frac{1}{	ext{Stability}}$$

Joints (Articulations): Structure, Classification, and Function

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