Outer ear: The part of the ear that is visible along the side of the head. The outer ear consists of the pinna, or auricle (the visible projecting portion of the ear), the external acoustic meatus (the outside opening to the ear canal), and the external ear canal, which leads to the eardrum. The outer ear concentrates air vibrations on the eardrum to make the eardrum vibrate. Search MedTerms:
The muscles of mastication control chewing and include the temporalis, masseter, digastric, and the -glossus muscles of the tongue. Finally, the neck muscles include the sternocleidomastoid and splenius muscles, which move the head.
Weight Training. Here's the heads up on the abdominal muscles: what they are, where they are, how to train them, which exercises work best. The Abdominals Muscles: Three Main Groups. The 'abs' are the groups of muscles in the abdomen or the stomach area -- generally below the rib cage toward the pelvis and at the sides. The three main groups and their function are: Rectus abdominis (RA) The RA flexes the lumbar spine and tilts the pelvis and helps maintain the curvature of the lower spine.