Browse Items (150 total)

The Nose and its Adjacent Structures.jpg
Several bones that help form the walls of the nasal cavity have air-containing spaces called the paranasal sinuses, which serve to warm and humidify incoming air. Sinuses are lined with a mucosa. Each paranasal sinus is named for its associated bone:…

Muscles of Facial Expression.jpg
Many of the muscles of facial expression insert into the skin surrounding the eyelids, nose and mouth, producing facial expressions by moving the skin rather than bones.

Overview of the Muscular System.jpg
On the anterior and posterior views of the muscular system above, superficial muscles (those at the surface) are shown on the right side of the body while deep muscles (those underneath the superficial muscles) are shown on the left half of the body.…

Muscle Shapes and Fiber Alignment.jpg
The skeletal muscles of the body typically come in seven different general shapes.

Prime Movers and Synergists.jpg
The biceps brachii flex the lower arm. The brachoradialis, in the forearm, and brachialis, located deep to the biceps in the upper arm, are both synergists that aid in this motion.

Motor Units.jpg
A series of axon-like swelling, called varicosities or “boutons,” from autonomic neurons form motor units through the smooth muscle.

Muscle Contraction.jpg
The dense bodies and intermediate filaments are networked through the sarcoplasm, which cause the muscle fiber to contract.

Smooth Muscle Tissue.jpg
Smooth muscle tissue is found around organs in the digestive, respiratory, reproductive tracts and the iris of the eye.

Cardiac Muscle.jpg
Intercalated discs are part of the cardiac muscle sarcolemma and they contain gap junctions and desmosomes.

Muscle mass is reduced as muscles atrophy with disuse.
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