Skeleton and Joints

Lacuna refers to a hole, pit, “lake” or cavity within a bone.

There are 26 vertebrae: 7C, 12T, 5L, 1S, and 1C in that order. The sacrum and coccyx are single fused bones in adults.

Sesamoid refers to like a sesame seed. Many are normal parts of anatomy that ossify within tendons (patella, fabella, hallux sesamoid).

While the prefix “haemo-” refers to blood, the “-poiesis” part means making (or forming).

the “greater” trochanter is a bone marking (a bump) that lies on the lateral surface of the proximal femur, while the “lesser” trochanter lies on the medial surface of the proximal femur.

C1 to C7. There are eight carpals in each wrist. There are eight cranial bones. There are five lumbar vertebrae.

The thoracic cage (the ribs) is part of the axial skeleton.

Osteocytes develop from osteoblasts.

Fossa is a depression reminiscent of a (small) dinner table plate. A tuberosity is a roughening on a bone surface. The other two choices are projections above a bone surface.

Being proximal to the ankles excludes the bones of the ankle and feet. There are four bones in each leg (femur, patella, tibia, fibula); 4 + 4 = 8.