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An illustration of a Wallaby's skull.

Wallaby Skull

An illustration of a Wallaby's skull.

An illustration of the upper portion of a sponge: p, Pore; s, Subdermal cavity; c1, chief fiver of the skeleton; c2, connecting film. The sponges or poriferans (from Latin porus "pore" and ferre "to bear") are animals of the phylum Porifera. Their bodies consist of an outer thin layer of cells, the pinacoderm and an inner mass of cells and skeletal elements, the choanoderm. Sponges do not have nervous, digestive or circulatory systems. Instead most rely on maintaining a constant water flow through their bodies to obtain food and oxygen and to remove wastes, and the shapes of their bodies are adapted to maximize the efficiency of the water flow.

Upper Section of Sponge

An illustration of the upper portion of a sponge: p, Pore; s, Subdermal cavity; c1, chief fiver of the…

An illustration of the lower portion of a sponge. O, OS, and M are illustrations of sponge eggs magnified forty times. The sponges or poriferans (from Latin porus "pore" and ferre "to bear") are animals of the phylum Porifera. Their bodies consist of an outer thin layer of cells, the pinacoderm and an inner mass of cells and skeletal elements, the choanoderm. Sponges do not have nervous, digestive or circulatory systems. Instead most rely on maintaining a constant water flow through their bodies to obtain food and oxygen and to remove wastes, and the shapes of their bodies are adapted to maximize the efficiency of the water flow.

Lower Section of Sponge

An illustration of the lower portion of a sponge. O, OS, and M are illustrations of sponge eggs magnified…

A modern Radiolarian, showing the skeletal structure of silica and the extended fleshy threads or pseudopodia.

Radiolarian

A modern Radiolarian, showing the skeletal structure of silica and the extended fleshy threads or pseudopodia.

A modern sponge with silicious skeletal structure, and basal glass fibers for fixation (<em>Holtenia carpenteri</em>).

Holtenia Carpenteri

A modern sponge with silicious skeletal structure, and basal glass fibers for fixation (Holtenia…

Part of the skeletal structure of a lithisdid silicious sponge.

Jereiea Polystoma

Part of the skeletal structure of a lithisdid silicious sponge.

"Bones of Human Foot, or Pes, the third principal segment of the hind limb, consisting of tarsus, metatarsus, and phalanges. a, astralagus; ca, calcaneum; n, navicular, or scaphoid; co, cuboid; c1, c2, c3, entocuneiform, mesocuneiform, and ectocuneiform, or inner, middle, and outer cuneiform bones. The foregoing seven bones constitute the tarsus, and m1 to m5, first to the fifth metatarsal, constitue the metatarsus. The remaining fourteen bones are the phalanges, three to each digit excepting the great toe; h, distal phalanx of the hallux or great toe." -Whitney, 1911

Bones of Human Foot

"Bones of Human Foot, or Pes, the third principal segment of the hind limb, consisting of tarsus, metatarsus,…

This letter I is shown in uppercase, enclosed in a box with a background of a skeletal image running after a person.

Letter I

This letter I is shown in uppercase, enclosed in a box with a background of a skeletal image running…

This letter I is shown in uppercase, enclosed in a box with a background of a skeletal image running after a person.

Letter I

This letter I is shown in uppercase, enclosed in a box with a background of a skeletal image running…

An illustration of a Lace-Leaf plant also known as a Lattice Leaf or Lace Plant. The Lace-Leaf plant is an aquatic plant with oblong leaf blades measuring up to 65 cm. The leaves of the plant lay beneath the water and are purely skeletal, with not tissue. The flowers grow above the water's surface.

Lace-leaf Plant

An illustration of a Lace-Leaf plant also known as a Lattice Leaf or Lace Plant. The Lace-Leaf plant…

Striped, or striated, muscle which quickly contracts causing the alternating black and white lines. It has very delicate fibers (M FL). It is stimulated by nerve fibers (N F), which divide into an endplate (N E) on the contracting surface. N are nuclei, which are a part of elongated cells that fused together to make the muscle. M stands for muscle and N, except for nuclei, stands for nerve.

Striated Muscle

Striped, or striated, muscle which quickly contracts causing the alternating black and white lines.…

The elbow has a simple hinge joint. Tendons attach muscle to bones.

Elbow Joint

The elbow has a simple hinge joint. Tendons attach muscle to bones.

This illustration shows a section of a human kidney (A, Cortical substance; B, Pyramids; C, Hilum; D, Pelvis; E, Ureter; F, Suprarenal capsule). Kidneys are excretory organs whose function is to get rid of nitrogenous waste.

Section of Human Kidney

This illustration shows a section of a human kidney (A, Cortical substance; B, Pyramids; C, Hilum; D,…

This illustration shows a section on the knee (A, Femur; B, Tibia; C, Patella; D, Synovial sac; E, bursæ). The knee is a hinge-joint, and the bones entering into its formation are the lower end of the femur, the upper end of the tibia, and the posterior surface of the patella (knee-cap).

Section of the Knee

This illustration shows a section on the knee (A, Femur; B, Tibia; C, Patella; D, Synovial sac; E, bursæ).…