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

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
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.
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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".
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern