ANATOMY

Detailed explanation-1: -Pennate muscles (penna = “feathers”) blend into a tendon that runs through the central region of the muscle for its whole length, somewhat like the quill of a feather with the muscle arranged similar to the feathers.

Detailed explanation-2: -Soleus muscle exhibits bipennate arrangement on its centro-anterior aspect and the longitudinal parallel muscle fibers on its posterior and lateral margins.

Detailed explanation-3: -In a unipennate muscle, the fascicles are located on one side of the tendon. The extensor digitorum of the forearm is an example of a unipennate muscle.

Detailed explanation-4: -Muscle shape The deltoid muscle is apennate muscle which has its fascicles arranged in a feather-like arrangement.