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In vertebrate animals that evolved to lose their tails (e.g. frogs and hominid primates), the coccyx is the homologous vestigial of the tail. While tails are primarily considered a feature of vertebrates, some invertebrates such as scorpions and springtails, as well as snails and slugs, have tail-like appendages that are also referred to as tails.
A limb (from Old English lim, meaning "body part") is a jointed, muscled appendage of a tetrapod vertebrate animal used for weight-bearing, terrestrial locomotion and physical interaction with other objects. The distalmost portion of a limb is known as its extremity.
Limb (anatomy) of a tetrapod animal, more specifically its distalmost portion, including: Hand, a prehensile, multi-digited organ located at the end of the arm of bipedal primates (especially humans) Foot, the terminal portion of a limb which bears weight and allows locomotion; Paw, a furry, padded foot with claws, common in many quadruped animals
Limb (anatomy), an appendage of a human or animal; Limb, a large or main branch of a tree; Limb, in astronomy, the curved edge of the apparent disk of a celestial body, e.g. lunar limb; Limb, in botany, the border or upper spreading part of a petal or sepal; Limb, in a measuring instrument, the graduated edge of a circle or arc
At the posterior end is a tail which continues the spinal cord and vertebrae but not the gut. The mouth is found at the anterior end of the animal, and the anus at the base of the tail. [27] The defining characteristic of a vertebrate is the vertebral column, formed in the development of the segmented series of vertebrae.
In most cases this larval stage is a limbless free-living organism that has a tail and is referred to as a tadpole, although in a few cases (e.g., in the Breviceps and Probreviceps genera of frogs) direct development occurs in which the larval stage is confined within the egg.
[1] [2] Each limb must complete a cycle in the same length of time, otherwise one limb's relationship to the others can change with time, and a steady pattern cannot occur. Thus, any gait can completely be described in terms of the beginning and end of stance phase of three limbs relative to a cycle of a reference limb, usually the left hindlimb.
Definition Etymologic memory aid; apophysis: Any of various processes or protuberances on a bone. apo-+ physis, "outward from the growth part; outgrowth" diaphysis: The long, relatively straight main body of a long bone; region of primary ossification. Also known as the shaft. dia-+ physis, "between the growth parts" epiphysis