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Anatomy of The Lumbar Back Muscles-Multifidus

The multifidus is the most medial and largest of the paraspinal muscles. It has an origin and insertion of vertebra to vertebra attachments within the lumbar spine and between the lumbar and sacral vertebrae .

The multifidus is composed of repeating fascicles, which originate from the laminae and spinous processes of the lumbar vertebrae and […]

Tendon

Tendon Structure and Architecture

Tendon is juxtaposed between muscle and bone and is responsible for transmitting muscular forces to the skeletal system during limb locomotion. It is a dense, regularly arranged connective tissue that is well suited for resisting tensile loads with minimal elongation during muscle contraction.

Approximately 85% of a tendon’s dry weight is […]

Structure And Architecture Of Skeletal Muscle

Histology

Understanding the structure and architecture of skeletal muscle begins at the level of the muscle cell, or fiber, itself. Muscle fibers are multinucleated cells with a cylindrical shape, and they have diameters ranging between 10 to 100 µm. Fibers range a few millimeters to several centimeters in length. This wide variation in muscle fiber […]

Skeletal Muscle and Tendon

Key Points

Skeletal muscle has a complex organization of nerves, blood vessels, and connective tissue matrix that protects against injury and organizes individual cellular elements into functional contractile units of muscle. Muscle fibers range a few millimeters to several centimeters in length. Fibers are arranged into larger units known as fascicles. Perimysium, a connective tissue […]

Periarticular Ligamentous Tissue: A Biochemical and Physiologic Assessment-Structure

Structure

The histology of periarticular tendons and ligaments is a much-neglected area of investigation. Although many histology texts combine these two tissues as “dense, regular connective tissue”, certain ligaments and tendons are sufficiently characteristic to be distinguishable from each other based upon their histological appearance .

The variables considered are collagen bundle width, cell morphology […]