Multiple Choice
Which anatomical term refers to the bony prominence on the lateral side of the elbow, commonly known as the 'a' feature in diagrams of the arm?
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1. Introduction to Anatomy & Physiology
Anatomical Terms for the Arm and Hand
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What is the elongated cylindrical shaft of a long bone called?
A
Metaphysis
B
Epiphysis
C
Periosteum
D
Diaphysis
Verified step by step guidance1
Step 1: Understand the structure of a long bone. A long bone typically consists of three main parts: the epiphysis (ends of the bone), the metaphysis (region between the epiphysis and diaphysis), and the diaphysis (the elongated cylindrical shaft).
Step 2: Define the term 'diaphysis.' The diaphysis is the central shaft of a long bone, primarily composed of compact bone tissue that provides strength and support.
Step 3: Compare the diaphysis with other parts of the long bone. The epiphysis is the rounded end of the bone, which participates in joint formation, while the metaphysis is the transitional region where growth occurs during development.
Step 4: Note the periosteum is not part of the internal structure but rather a fibrous membrane covering the outer surface of the bone, aiding in nourishment and repair.
Step 5: Conclude that the elongated cylindrical shaft of a long bone is called the diaphysis, based on its structural and functional characteristics.
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