Question

1. label each of the joints shown below.

vocabulary review
write a good definition for each of the following words.

1. ball - and - socket joint:
2. fixed joint:
3. gliding joint:
4. hinge joint:
5. joint:
6. pivoting joint:

Explanation:

1. A ball - and - socket joint is a type of synovial joint where the rounded end of one bone (the ball) fits into the cup - like depression (the socket) of another bone, allowing a wide range of motion in multiple directions such as in the shoulder and hip.
2. A fixed joint, also known as a synarthrosis, is a joint where the bones are held firmly together by fibrous tissue or cartilage, allowing little to no movement, like the joints between the bones of the skull.
3. A gliding joint, or a plane joint, is a synovial joint in which the articulating surfaces are flat or slightly curved, allowing bones to glide over one another, such as the joints between the carpal bones in the wrist.
4. A hinge joint is a synovial joint that allows movement primarily in one plane (flexion and extension), similar to the opening and closing of a door hinge, like the elbow and knee joints.
5. A joint is a point of contact between two or more bones, between a bone and cartilage, or between a bone and teeth. It can be movable (diarthrosis), slightly movable (amphiarthrosis), or immovable (synarthrosis).
6. A pivot joint is a synovial joint that allows rotational movement around a single axis. For example, the joint between the first and second cervical vertebrae (atlas and axis) that allows the head to turn from side - to - side.

For the labeling part:
a. Gliding (joints in the wrist)
b. Fixed (skull joints)
c. Pivot (joint between atlas and axis in neck shown in the vertebrae image)
d. Ball - and - socket (hip joint)
e. Hinge (knee joint)

Answer:

1. A synovial joint where a rounded end of one bone fits into a cup - like depression of another, allowing multi - directional movement.
2. A joint with little to no movement held together by fibrous tissue or cartilage.
3. A synovial joint with flat or slightly curved articulating surfaces allowing gliding motion.
4. A synovial joint allowing movement mainly in one plane (flexion and extension).
5. A point of contact between bones, bone and cartilage, or bone and teeth, with varying degrees of movement.
6. A synovial joint allowing rotational movement around a single axis.

a. Gliding joint
b. Fixed joint
c. Pivot joint
d. Ball - and - socket joint
e. Hinge joint