Q7 Atlanto-occipital joint

Question 1

State the type of joint

Answer 1

Synovial ellipsoid joint

Question 2

Briefly describe the articular surfaces

Answer 2

Oval articular facets on the upper surface of the atlas are concave about both axes,
Articular surfaces of the occipital condyles are reciprocally curved (elongated ovals and convex)
Both surfaces are covered in hyaline cartilage.

Question 3

List 3 ligaments or membranes associated with this joint

Answer 3

Anterior atlanto-occipital membrane
Posterior atlanto-occipital membrane
Ligamentum nuchae
TECTORIAL MEMBRANE

Question 4

Name two movements that occur at this joint. Give a brief explanatory description for each movement

Answer 4

Flexion: Retraction/flexion (tucking chin back) of the chin
Extension: Protraction/extension (pocking chin forwards) of the chin.
Lateral flexion, taking the earlobe to the shoulder