Pelvis Diagram Coccyx

Unlike the bones of the pectoral girdle which are highly mobile to enhance the range of upper limb movements the bones of the pelvis are strongly united to each other to form a largely immobile weight bearing structure.

Pelvis diagram coccyx. There are two hip bones one on the left side of the body and the other on the right. A pair of large flat bones known as the os coxae or hip bones extend anteriorly and laterally from the sacrum at the sacroiliac joints to form the bulk of the pelvis. In the human body the coccyx functions to anchor several muscles of the pelvic region and acts as one of the bones that bear the body s weight while sitting. The coccyx also known as the tailbone is the terminal part of the vertebral column.

The bony pelvis is the entire structure formed by the two hip bones the sacrum and attached inferiorly to the sacrum the coccyx. The coccyx or tailbone is both the smallest and the most inferior bone in the spinal column. It is a vestige of the caudal vertebrae found in the tails of most mammals. The sacrum and coccyx are unlike other bones in your spinal column.

The bones of the pelvis are the hip bones sacrum and coccyx. Coccyges or coccyxes commonly referred to as the tailbone is the final segment of the vertebral column in all apes and analogous structures in certain other mammals such as horses in tailless primates e g. See normal spinal anatomy. The sacrum sometimes called the sacral vertebra or sacral spine s1 is a large flat triangular shaped bone nested between the hip bones and positioned below the last lumbar vertebra l5.

It represents a vestigial tail hence the common term tailbone. It is comprised of four vertebrae which fuse to produce a triangular shape. Together they form the part of the pelvis called the pelvic girdle. Humans and other great apes since nacholapithecus a miocene hominoid the coccyx is theorized to be the remnant of a vestigial tail although it shows non tail like.

Depending on an individual s development the coccyx may consist of three to five different bones connected by fused or semi fused joints and or disc like ligaments. The coccyx is a triangular arrangement of bone that makes up the very bottom portion of the spine below the sacrum. Each hip bone contains three bones the ilium ischium and pubis that fuse together as we grow older the sacrum five fused. In primates the pelvis consists of four parts the left and the right hip bones which meet in the mid line ventrally and are fixed to the sacrum dorsally and the coccyx.

Several pelvic muscles attach to the coccyx.