ANAT101 Week Two

The hip joint is a ​ (a)   , ​ (b)   , ​ (c)   joint

• synovial
• multiaxial
• ball and socket
• fibrous
• cartilaginous
• biaxial
• uniaxial
• plane
• hinge
• condyloid

What plane/axis does abduction/adduction occur on at the hip?

• Sagittal/transverse

• Coronal/anteroposterior

• Transverse/longitudinal

The acetabulum is formed by

• 1/5 ilium

• 2/5 ilium

• 2/5 ischium

• 1/5 pubis

• 2/5 pubis

The acetabular notch is a superior deficiency in the acetabulum covered by the transverse ligament

• True

• False

Answer explanation

Which of the following is LEAST LIKELY to be a function of the acetabular labrum?

• Deepen socket

• Increase stability

• Improve articular fit

• Increase range of motion

Which type of surface either female or male is the head of the femur at the hip joint?

• Female (concave)

• Male (convex)

The hip joint capsule is thickest

• Anteriorly and inferiorly

• Anteriorly and superiorly

• Posteriorly and superiorly

• Posteriorly and inferiorly

Short answer: What are the factors contributing to stability of the hip joint?

Answer explanation

Factors contributing to stability of the hip joint include:

- Articular fit including high congruency of articulating surfaces

- Acetabular labrum improving articular fit

- Strong joint capsule formed by three capsular ligaments

- Line of pull of muscles pulling femoral head into hip joint

- Angle of inclination of femoral neck/head with the shaft of femur

Match the following characteristics of muscle with their classification

• Extensibility

• Shorten and generate force

• Contractility

• Returns to original length

• Elasticity

• Can be stretched

• Excitability

• Respond to stimulus

Describe the sliding filament theory of muscle contraction

Answer explanation

Sliding filament contraction occurs within a myofibril, which is one part of a muscle fibre or cell

The actin and myosin filaments slide over and lock onto one another producing contraction