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Pelvic fin of a Java barb, a ray-finned fish The short fin spines on a coelacanth, a lobe-finned fish A lionfish, with venomous spines The stinger on a stingray's tail. Spines are found in the fins of most bony fishes, particularly actinopterygians (ray-finned fishes), who have folding fan-like fin made of spreading bony spines called lepidotrichia or "rays" covered by thin stretches of skin.
Spinal column, also known as the backbone; Dendritic spine, a small membranous protrusion from a neuron's dendrite; Thorns, spines, and prickles, needle-like structures in plants; Spine (zoology), needle-like structures in animals; SPINE (molecular biology) (strep–protein interaction experiment), a method for the detection of protein interactions
In plants, a rachis is the main axis of a compound structure.It can be the main stem of a compound leaf, such as in Acacia or ferns, or the main, flower-bearing portion of an inflorescence above a supporting peduncle.
A white-headed dwarf gecko with tail lost due to autotomy. Autotomy (from the Greek auto-, "self-" and tome, "severing", αὐτοτομία) or 'self-amputation', is the behaviour whereby an animal sheds or discards an appendage, [1] usually as a self-defense mechanism to elude a predator's grasp or to distract the predator and thereby allow escape.
The spinal column, also known as the vertebral column, spine or backbone, is the core part of the axial skeleton in vertebrates. The vertebral column is the defining and eponymous characteristic of the vertebrate. The spinal column is a segmented column of vertebrae that surrounds and protects the spinal cord.
Cognitive ethology is a branch of ethology concerned with the influence of conscious awareness and intention on the behaviour of an animal. [1] Donald Griffin, a zoology professor in the United States, set up the foundations for researches in the cognitive awareness of animals within their habitats.
Area of the human body surface innervated by each spinal nerve. Even mammals, including humans, show the segmented bilaterian body plan at the level of the nervous system. The spinal cord contains a series of segmental ganglia, each giving rise to motor and sensory nerves that innervate a portion of the body surface and underlying musculature.
Increased spinal flexion during galloping; Decreased distal limb weight (in order to minimize moment of inertia): Increase in mass of proximal muscles with decrease in mass of distal muscles; Increase in length of distal limb bones (the manus and pes) rather than proximal ones (the brachium or thigh). Longer tendons in distal limb