If you are a politician, that would probably be "proximity" but, the answer that you are probably looking for is "immovable joints". The skull is composed of around 22 bones but the only movable joints in an adult are the mandibular joints and the joint at the uppermost cervical vertebra, the "atlas". The pelvis of an adult human is, likewise, composed of the ilium, ischium, pubis and the os coxae. Those bones are all held together by immovable joints, too.
Spine.
The Pelvis And The Skull .
tendon
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Skull does not belong as it protects the brain, while the others are part of the axial skeleton that makes up the central core of the body.
The ones that make up the pelvis and the skull.
the skull, pelvis, ribs, and scapula
The term "endoskeleton" includes the others (skull, spine, and pelvis) because it refers to the internal framework of bones that provides support and protection to the body. The skull, spine, and pelvis are all examples of bones that make up the endoskeleton.
Your skull, ribs, and pelvis are attached to your spinal column.
Long bones, such as the femur and humerus. Short bones, like the carpal and tarsal bones. Flat bones, including the skull and ribs. Irregular bones, such as the vertebrae and hip bones. Sesamoid bones, like the patella (kneecap). Sutural bones, found within sutures of the skull.
There is no such thing as regular bones, you may be confused with irregular bones such as the vertebrae, pelvis, many of the skull bones.
short answer - the sacrum and the base of the skull.