What is Pennate muscle?
A pennate or pinnate muscle (also called a penniform muscle) is a type of skeletal muscle with fascicles that attach obliquely (in a slanting position) to its tendon.
What does Bipennate mean?
[ bī-pĕn′āt′ ] adj. Of or relating to a muscle with a central tendon toward which the fibers converge on either side like the barbs of a feather.
What is an example of a Multipennate muscle?
A type of pennate muscle wherein the diagonal muscle fibers are in multiple rows with the central tendon branching into two or more tendons. Example of multipennate muscle is deltoid muscle.
What is a triangular muscle?
A flat muscle with a broad origin and narrow insertion.
What is the advantage of pennate muscles?
The advantage of this arrangement, first appreciated by anatomists >300 years ago (5), is that more fibers can be packed into a given volume of muscle, and thus the force of a pennate muscle is greater than a parallel-fibered muscle of equal volume (6).
What do pennate muscles resemble?
Pennate muscles resemble the shape of a feather, with muscle fibers approaching a central tendon at an oblique angle (Fig. 3.7D). The diagonal orientation of the fibers maximizes the muscle’s force potential. Many more muscle fibers fit into the muscle compared with a similarly sized fusiform muscle.
What are the three types of Pennate muscles?
Pennate muscles can be further subdivided into unipennate (e.g. flexor pollicis longus), bipennate (e.g. rectus femoris, dorsal interossei), multipennate (e.g. deltoid), and circumpennate or cylindrical (e.g. tibialis anterior).
Are hamstrings Pennate muscles?
shoulder is said to be pennate; relatively short fibres attach diagonally onto a tendon that penetrates far into the muscle. The ankle muscles shown in Figure 4B are pennate muscles, but most of the hamstring muscles (at the back of the thigh) are parallel.
What is a quadrilateral muscle?
Quadrilateral-type muscles have fibers in parallel, and are oriented in the same longitudinal axis as the tendon (Figure 8.7). Examples of quadrilateral-type muscles include the pronator quadratus and quadratus plantae. Familiarity with the different arrangement of muscles improves recognition of the muscle landmarks.
What is the Deltoideus muscle?
Your deltoid muscles are in your shoulder, which is the ball-and-socket joint that connects your arm to the trunk of your body. They also protect and stabilize your shoulder joint. Like most other muscles in your body, the deltoids are skeletal muscles.
Are pennate muscles stronger?
The fibers of these muscles are shorter and are situated at an angle to the long axis of the muscle. Thus, if two muscles were of equal cross-sectional area, a pennate muscle would be stronger than a parallel fibered one because of its larger physiological cross-sectional area.