Phalanx
Long bone, part of the appendicular skeleton
Also known as: Toe bone or finger bone
Classification
Long bone, part of the appendicular skeleton
Dimensions
Small and slender, varying from stubby square shapes in the tips to elongated, miniature tubes in the middle sections.
Key Features
Small, boxy or tubular shape with a slightly narrowed middle section and smooth, rounded ends that fit neatly together like building blocks.
Similar Bones
Metacarpals or metatarsals from the palm or arch of the foot, which are generally longer, thicker, and feature broader ends.
Across Species
In human hands and feet, these bones provide dexterity and balance. In bats, they are exceptionally elongated to stretch out wings for flight. In whales and dolphins, they multiply in number inside the flipper to form a wide, paddle-like structure.
Evolutionary History
Originating from the fin rays of ancient fish ancestors, these bones adapted for weight-bearing and grasping as tetrapods first ventured onto land during the Devonian period.
Photography Tips
Place the bone on a solid, neutral-background surface with good overhead lighting. Include a small coin or ruler next to it for scale, and take shots from both the top view and the side profile to show the curves and ends clearly.