Identification of synovial joints in the human body.

Let's go through the questions and provide a clear explanation for each part, including corrections where necessary.

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Question 7: How many types of freely moveable joints are there?

(1 mark)

✔ Answer: There are six types of synovial joints.

🔹 Explanation: Freely movable joints (also called diarthrodial joints) are classified into six main types based on their structure and range of motion:
1. Ball-and-socket joint
2. Hinge joint
3. Pivot joint
4. Condyloid joint
5. Saddle joint
6. Gliding (plane) joint

These joints allow various degrees of movement and are all filled with synovial fluid to reduce friction.

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Question 8: Under each picture write the names of the synovial joints shown.

(8 marks)

We’ll analyze each diagram:

#### a. Humerus → Elbow region
- The joint between the humerus and ulna at the elbow.
- This is a hinge joint, allowing flexion and extension.

✔ Correct answer: Hinge joint

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#### b. Metacarpal of thumb & Carpal
- This shows the thumb base (where the metacarpal meets the carpal bone).
- It allows unique movements like opposition (touching the thumb to fingertips), which is characteristic of a saddle joint.

✔ Correct answer: Saddle joint

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#### c. Femur & Pelvis (Hip joint)
- The head of the femur fits into the acetabulum of the pelvis.
- This is a ball-and-socket joint, allowing rotation, flexion, extension, abduction, adduction, and circumduction.

✔ Correct answer: Ball and socket joint

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#### d. Wrist joint (between radius and carpals)
- Shows articulation between the radius and the carpal bones.
- Allows flexion, extension, abduction, adduction, and circumduction — but not full rotation.
- This is a condyloid joint (also known as an ellipsoid joint).

✘ Incorrectly labeled in your image as “______” — should be:

✔ Answer: Condyloid joint

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#### e. Atlas and Axis (C1-C2 vertebrae)
- The joint between the atlas (C1) and axis (C2).
- Allows rotation of the head (like turning your head side to side).
- This is a pivot joint.

✔ Answer: Pivot joint

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#### f. Ulna and Carpals (Wrist)
- Shows the articulation between the ulna and carpal bones.
- But note: the distal radioulnar joint (between radius and ulna) is a pivot joint.
- However, this diagram appears to show intercarpal joints or wrist joint, but specifically the articulation between the ulna and carpals may refer to the distal radioulnar joint if it includes the radius, but here only ulna and carpals are labeled.

Wait — actually, this looks like the radiocarpal joint, but since the radius isn’t labeled, and only ulna and carpals are shown, it might be referring to intercarpal joints.

But more likely, it’s showing gliding (plane) joints between the carpal bones themselves.

➡️ The intercarpal joints (between individual carpal bones) are gliding (plane) joints.

✔ Answer: Gliding joint (or Plane joint)

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✔ Final Answers for Question 8:

| Diagram | Joint Type |
|--------|------------|
| a | Hinge joint |
| b | Saddle joint |
| c | Ball and socket joint |
| d | Condyloid joint |
| e | Pivot joint |
| f | Gliding joint |

> Note: The bottom two diagrams (d, e, f) were missing labels in your image, so we’ve filled them in based on anatomy.

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Next Section: Identify one area in the body where the following joints can be found

Let’s complete this section accurately.

#### a. Ball-and-socket joint
- Found in: Hip joint (between femur and acetabulum)
- Also: Shoulder joint (humerus and scapula)

✔ Example: Hip joint

#### b. Hinge joint
- Found in: Elbow joint (humerus and ulna)
- Also: Knee joint

✔ Example: Elbow joint

#### c. Pivot joint
- Found in: Atlantoaxial joint (between C1 and C2 vertebrae)

✔ Example: Joint between atlas and axis

#### d. Condyloid joint
- Found in: Wrist joint (radiocarpal joint)

✔ Example: Wrist joint

#### e. Gliding (plane) joint
- Found in: Between carpal bones (intercarpal joints)
- Also: Facet joints in spine

✔ Example: Inter-carpal joints

#### f. Saddle joint
- Found in: Thumb (carpometacarpal joint of the thumb)

✔ Example: Base of the thumb

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✔ Final Answer Summary:

#### Question 7:
There are six types of freely moveable (synovial) joints.

#### Question 8:
a. Hinge joint
b. Saddle joint
c. Ball and socket joint
d. Condyloid joint
e. Pivot joint
f. Gliding joint

#### Identify locations:
a. Ball-and-socket – Hip joint
b. Hinge – Elbow joint
c. Pivot – Atlantoaxial joint (C1-C2)
d. Condyloid – Wrist joint
e. Gliding – Inter-carpal joints
f. Saddle – Carpometacarpal joint of the thumb

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