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A sarcomere is defined as the segment between two neighbouring Z-lines (or Z-discs). In electron micrographs of cross-striated muscle, the Z-line (from the German "zwischen" meaning between) appears in between the I-bands as a dark line that anchors the actin myofilaments. Surrounding the Z-line is the region of the I-band (for isotropic).
The pectinate line (dentate line) is a line which divides the upper two-thirds and lower third of the anal canal. Developmentally, this line represents the hindgut - proctodeum junction. It is an important anatomical landmark in humans, and several distinctions can be made based upon the location of a structure relative to this line: Distinction.
The z-line defines the borders of each sarcomere and act as the connection point between the thin filaments. The t-tubules and sarcoplasmic reticulum are used in conjunction to receive and direct the calcium ions and cause contraction. Once contracted, the clear H-zone between the actin filaments disappears as the filaments move towards each other.
Abduction: moving your limbs laterally, away from the midline of the body (e.g., lifting your leg to the side) Adduction: moving your limbs medially, toward the midline of the body (e.g., lowering ...
List of anatomical lines. Axillary lines. Vertical lines: Midline, lateral sternal line, parasternal line and midclavicular line. Horizontal lines: Level of the sternal angle, and zipho-sternal line. Anatomical "lines", or "reference lines," are theoretical lines drawn through anatomical structures and are used to describe anatomical location.
The study of human anatomy reaches back thousands of years, to the Romans and Greeks. Herophilus, the Greek anatomist, is considered the first to take a scalpel to skin to see how our bodies work ...
Intercalated discs or lines of Eberth are microscopic identifying features of cardiac muscle. Cardiac muscle consists of individual heart muscle cells (cardiomyocytes) connected by intercalated discs to work as a single functional syncytium. By contrast, skeletal muscle consists of multinucleated muscle fibers and exhibits no intercalated discs.
The spinalis is the body’s most medial, or closest to the midline of the body, deep back muscle and originates at the spinous processes (bony projections at the back of each vertebra) of the ...