Which is not part of your appendicular skeleton?

Briefly describe the structural differences between the two and how this impacts the available motions at each joint.

Answer and explanation.

The shoulder and hip are both ball and socket joints, which means they have a round end of one bone that fits into a small cup-like area of another bone.

However, the shoulder joint is more mobile than the hip joint, which means it can move in more directions, but it is also more unstable and prone to dislocation.

The hip joint is more stable than the shoulder joint, which means it can support more weight and force, but it has less range of motion.

The shoulder joint allows for eight different movements: flexion, extension, abduction, adduction, internal rotation, external rotation, horizontal abduction, and horizontal adduction.

The hip joint allows for six different movements: flexion, extension, abduction, adduction, internal rotation, and external rotation.

The shoulder joint has a larger socket than the hip joint, which gives it more freedom of movement.

The hip joint has a smaller socket than the shoulder joint, which makes it more secure and stable.

The shoulder and hip joints are both important for many daily functions and activities.

They are also both susceptible to injuries and conditions such as osteoarthritis, inflammatory arthritis, and labrum tears.

Hip flexion refers to the movement of the thigh bone (femur) towards the front of the body, bringing the knee closer to the chest.
This movement is achieved by the contraction of muscles in the front of the hip, including the iliopsoas and rectus femoris muscles.
The joint involved in hip flexion is the hip joint, which is a ball-and-socket joint formed by the articulation between the head of the femur and the acetabulum of the pelvis.
This joint allows for a range of movements, including:
1. Hip extension: This refers to the movement of the thigh bone backwards, away from the front of the body, which is achieved by the contraction of muscles in the back of the hip, including the gluteus maximus and hamstrings.

2. Hip abduction: This refers to the movement of the thigh bone away from the midline of the body, towards the side, which is achieved by the contraction of muscles on the outside of the hip, including the gluteus medius and tensor fasciae latae.
3. Hip adduction: This refers to the movement of the thigh bone towards the midline of the body, which is achieved by the contraction of muscles on the inside of the hip, including the adductor muscles.
4. Hip external rotation: This refers to the movement of the thigh bone away from the midline of the body and outwards, which is achieved by the contraction of muscles on the back of the hip, including the piriformis and gemellus muscles.
5. Hip internal rotation: This refers to the movement of the thigh bone towards the midline of the body and inwards, which is achieved by the contraction of muscles on the inside of the hip, including the gluteus minimus and tensor fasciae latae.
All of these movements of the hip joint are important for walking, running, and other activities that require the use of the lower limbs.
Additionally, a lack of hip flexibility or strength can lead to compensatory movements in other parts of the body, which can result in pain or injury over time.