Identification of different types of synovial joints in the human body.

Let's go through the questions and provide a clear, accurate explanation for each.

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

(1 mark)

✔ Answer: There are six types of synovial (freely movable) joints.

🔹 Explanation:
Freely movable joints are called synovial joints, and they allow a wide range of motion. The six types are:
1. Ball and socket joint
2. Hinge joint
3. Pivot joint
4. Condyloid joint
5. Saddle joint
6. Gliding (plane) joint

These are all classified based on their structure and the type of movement they allow.

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

(8 marks)

Let’s identify each joint based on the diagrams:

#### a. Humerus → Elbow region
- This shows the humerus articulating with the ulna at the elbow.
- Movement is primarily flexion/extension (like a door hinge).
- ✔ Answer: Hinge joint

#### b. Metacarpal of thumb & Carpal
- This is the joint between the thumb metacarpal and the trapezium (a carpal bone).
- It allows unique movements like opposition (touching the thumb to other fingers).
- ✔ Answer: Saddle joint

#### c. Femur & Pelvis (acetabulum)
- The head of the femur fits into the acetabulum of the hip bone.
- Allows rotation, flexion, extension, abduction, adduction — full range of motion.
- ✔ Answer: Ball and socket joint

#### d. Wrist joint (radius and carpals)
- The arrow points to the joint between the radius and the carpal bones.
- This allows side-to-side and up-and-down motion.
- ✔ Answer: Condyloid joint (also called ellipsoid joint)

> Note: This is not a hinge or pivot; it allows movement in two planes but no rotation.

#### e. Atlas and Axis (C1 and C2 vertebrae)
- The dens (odontoid process) of the axis (C2) rotates within the atlas (C1).
- Allows rotation of the head (e.g., "no" motion).
- ✔ Answer: Pivot joint

#### f. Ulna and Carpals (wrist)
- This shows the ulnar bone articulating with the carpal bones.
- The joint allows gliding motions between flat surfaces.
- ✔ Answer: Gliding (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 (plane) joint |

> Note: You have 6 diagrams here, but the question says “(8 marks)” — possibly because some parts are worth more, or there may be an error. But based on the images, these are the correct labels.

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

Now let’s complete this section with correct anatomical examples:

#### a. Ball and socket joint
→ Hip joint (between femur and pelvis)
OR Shoulder joint (between humerus and scapula)

✔ Example: Hip joint

#### b. Hinge joint
→ Elbow joint (humerus–ulna)
OR Knee joint (femur–tibia)

✔ Example: Elbow joint

#### c. Pivot joint
→ Atlantoaxial joint (between C1 and C2 vertebrae)

✔ Example: Joint between atlas and axis

#### d. Condyloid joint
→ Wrist joint (radiocarpal joint)

✔ Example: Wrist joint

#### e. Gliding (plane) joint
→ Between carpal bones (in wrist), or between tarsal bones (in ankle)

✔ Example: Inter-carpal joints

#### f. Saddle joint
→ Thumb (carpometacarpal joint)

✔ Example: Base of the thumb

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✔ Final Answer Summary:

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

Question 8 – Joint Identification:
- a. Hinge joint
- b. Saddle joint
- c. Ball and socket joint
- d. Condyloid joint
- e. Pivot joint
- f. Gliding (plane) joint

Body Locations:
- Ball and socket: Hip joint
- Hinge: Elbow joint
- Pivot: Atlantoaxial joint
- Condyloid: Wrist joint
- Gliding: Inter-carpal joints
- Saddle: Thumb (CMC joint)

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