Rat Anatomy Index Cards

Rat Anatomy Index Cards - Each muscle is surrounded by its...

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Each muscle is surrounded by its own sheath of connective tissue known as fascia . The philtrum is the slit in the upper lip that allows the rat to gnaw on inedible material without ingesting it. It allows the lips to wrap behind the two front teeth. The nictitating membrane is the “third eyelid” and appears as a membrane that runs in a direction perpendicular to the two “normal” eyelids. Although it is somewhat reduced in the rat, you may be familiar with some other organisms that have more prominent nictitating membranes, like sharks that use it to protect their eyes when they go in for a strike to kill their prey. Auricles (or pinnae ) just refer to the external part of the ear and vibrissae are the “whiskers” used for detecting vibrations.
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The serratus dorsalis , the only muscle not depicted on the images, lift up the latissimus dorsi and you will find it underneath. It is similar in appearance to the serratus ventralis in that it looks “jagged” or “serrated” due to insertions onto each rib, but it is located more dorsally on the organism. Origin : the place closest (proximal) to the main axis of the body where a muscle attaches, or else the attachment which moves the least when the muscle contracts. Insertion : the opposite end of the muscle from the origin, farthest from (distal to) the main axis of the body, or the attachment which moves the most with muscle contraction. Ceps : Latin for "head". A muscle with several origins may have the word "ceps" in its name, e.g. triceps = three heads. Slips : if the origin or insertion is divided into a number of separate parts and the body of the muscle itself is composed of a number of parallel bands, it is said that the muscle "arises by a series of slips". This is frequently the case with muscles
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Rat Anatomy Index Cards - Each muscle is surrounded by its...

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