Linear projection-a time line
In a first angle projection, the object stands in between the observer and the plane of projection. In a third angle project, the object and the plane of projection is interchanged.
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That's true of the Mercator projection, among others.
thrid angle projection is officially used in Australia, for a fact, not lying!!
condyle
A rounded convex projection on a bone is called a tubercle. It is usually a small bump or nodule that serves as an attachment point for muscles or tendons.
The articular projection you are referring to is likely a condyle. Condyles are rounded prominences at the end of a bone that form a joint with another bone. They are supported by a neck, which is a narrowed region connecting the condyle to the rest of the bone.
A smooth rounded end of a bone is called an articular surface. It is covered with articular cartilage to allow for smooth movement at a joint.
tubercle
The spine is a projection of bones that form the vertebral column. It is not a depression.
A large concave or rounded articular prominence of a bone is called a condyle. Condyles generally serve as sites of attachment for muscles and ligaments, as well as forming joints with other bones.
malleus,ear bone
A sharp projection from the surface of a bone is called a process. Bones can have different types of processes, such as a spinous process, which is a sharp, pointed projection; or a tuberosity, which is a large, rounded projection. Processes serve as attachment points for ligaments and tendons.
A tuberacle is a small, rounded projection of a process formed where tendons or ligaments attach.
A rounded knob that articulates with another bone is called a condyle. These structures are found in joints where they help to facilitate smooth movement and stability during motion.
Articular Cartilage