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This human anatomy ClipArt gallery offers 242 illustrations the human muscular system. This includes both human skeletal muscle and human smooth and cardiac muscle. Human skeletal muscles (also known as striped, striated, or voluntary muscle) are those muscles that attach to bones and are involved in voluntary movements. Smooth muscles (also known as non-striated or involuntary muscle) are found lining the surface of internal organs such as the stomach, and cardiac muscles are those muscles specific to the heart. Both smooth and cardiac muscles are involuntarily controlled by the autonomic nervous system.

Muscles of the lower jaw. There are 2 muscles that work to draw down the lower jaw (a and b).

Muscles of the Lower Jaw

Muscles of the lower jaw. There are 2 muscles that work to draw down the lower jaw (a and b).

Temporal and deep muscles of the mouth.

Muscles of the Mouth

Temporal and deep muscles of the mouth.

"Diagram illustrating the muscles (drawn in thick black lines) which pass before and behind the joints and by their balanced activity keep the joints rigid and the body erect." —Martin, 1917

Muscle Diagram

"Diagram illustrating the muscles (drawn in thick black lines) which pass before and behind the joints…

Diagram of muscle fiber with sarcolemma attached. Muscular tissue is the tissue by means of which the active movements of the body are produced. All muscular tissue consists of fibers, and whenever a muscle fiber contracts, it tends to bring its two ends, with whatever may be attached to them, together.

Muscle Fiber

Diagram of muscle fiber with sarcolemma attached. Muscular tissue is the tissue by means of which the…

Diagram of the appearance in fresh muscle fiber. Labels: A, At low focus (B) the muscle columns appear dark and in a line with the granules, sarcoplasm light. At high focus (A) the sarcoplasm is dark, muscle columns light, and two rows of granules appear in a line with the sarcoplasm and alternating with the muscle columns.

Muscle Fiber

Diagram of the appearance in fresh muscle fiber. Labels: A, At low focus (B) the muscle columns appear…

Transverse section of muscle fiber, showing nuclei.

Muscle Fiber Showing Nuclei

Transverse section of muscle fiber, showing nuclei.

Portion of a human muscle fiber.

Portion of a Muscle Fiber

Portion of a human muscle fiber.

Section of a muscle fiber, showing areas of Cohnheim. three nuclei are seen lying close to the sarcolemma.

Section of a Muscle Fiber

Section of a muscle fiber, showing areas of Cohnheim. three nuclei are seen lying close to the sarcolemma.

"Fine threads of fibers forming a muscle." —Davison, 1910

Muscle fibers

"Fine threads of fibers forming a muscle." —Davison, 1910

Fine threads of fibers forming a muscle.

Muscle Fibers

Fine threads of fibers forming a muscle.

A small bit of muscle composed of five primary fasciculi (bundles). Labels: A, natural size; B, the same magnified, showing the secondary fasciculi of which the primary are composed.

Muscle Fibers

A small bit of muscle composed of five primary fasciculi (bundles). Labels: A, natural size; B, the…

A small piece of muscular fiber highly magnified. At a the fiber has been crushed and twisted so as to tear away its contents, while the tougher sarcolemma, elsewhere so closely applied to the rest as to be invisible, remains untorn and conspicuous.

Muscle Fibers

A small piece of muscular fiber highly magnified. At a the fiber has been crushed and twisted so as…

Muscle fibers from the heart showing the striations and the junctions of the cells, highly magnified.

Muscle Fibers

Muscle fibers from the heart showing the striations and the junctions of the cells, highly magnified.

Representation of the direction and arrangement of the fibers in a spindle-shaped muscle (1), a radiated muscle (2). a peniform muscle (3), in a bipeniform muscle (4). Label: t, tendons of a muscle.

Representation of the Direction and Arrangement of the Muscle Fibers

Representation of the direction and arrangement of the fibers in a spindle-shaped muscle (1), a radiated…

Fragments of striped (striated) muscle fibers, showing a cleavage in opposite directions, magnified 300 diameters. Striped muscle is nearly always under the control of the will, and is often spoken of as voluntary muscle. Labels: A, longitudinal cleavage; c, fibrillae separated from one another at the broken end of the fiber; c'c", single fibrils more highly magnified, in c; the elementary structures are square, in c" round; B, transverse cleavage; a, b, partially detached disks; b' detached disk, more highly magnified, showing the sarcous elements.

Fragments of Striped (Striated) Muscle Fibers

Fragments of striped (striated) muscle fibers, showing a cleavage in opposite directions, magnified…

A,b,c, deltoid muscle; d, coracobrachialis muscle; r,r, triceps;e,i, extensors of the hand; km, flexor of fingers and radial and ulnar sides of the wtist, and l, palm of the hand, or palmaris longus; p, palmaris brevis; q, palmar fascia; o, biceps.

Arm Muscle

A,b,c, deltoid muscle; d, coracobrachialis muscle; r,r, triceps;e,i, extensors of the hand; km, flexor…

The upper bicep of the right arm. Included are the tendons, blood vessels, and its nerve.

Bicep Muscle

The upper bicep of the right arm. Included are the tendons, blood vessels, and its nerve.

A digastric muscle (two-bellied).

Digastric Muscle

A digastric muscle (two-bellied).

A digastric muscle.

Digastric Muscle

A digastric muscle.

Portion of medium sized human muscular fibre.

Human Muscle

Portion of medium sized human muscular fibre.

A microscopic view of a muscle showing, at one end, the fibrillae; and at the other, the disk, or cells of the fiber.

Microscopic View of a Muscle

A microscopic view of a muscle showing, at one end, the fibrillae; and at the other, the disk, or cells…

Striped, or striated, muscle which quickly contracts causing the alternating black and white lines. It has very delicate fibers (M FL). It is stimulated by nerve fibers (N F), which divide into an endplate (N E) on the contracting surface. N are nuclei, which are a part of elongated cells that fused together to make the muscle. M stands for muscle and N, except for nuclei, stands for nerve.

Striated Muscle

Striped, or striated, muscle which quickly contracts causing the alternating black and white lines.…

Two portion of muscle; one of which, a, is covered with membrane; the other, b, is uncovered; c, the muscular fibers terminating in tendon.

Two Portions of Muscle

Two portion of muscle; one of which, a, is covered with membrane; the other, b, is uncovered; c, the…

A frontal view of the human muscles. The right half shows superficial muscles and the left half shows deep muscles.

Muscles

A frontal view of the human muscles. The right half shows superficial muscles and the left half shows…

Muscles of the upper body.

Muscles

Muscles of the upper body.

Diagram illustrating the muscles (drawn in thick black lines) which pass before and behind the joints, and by their balanced activity keep the joints rigid and the body erect.

Muscles

Diagram illustrating the muscles (drawn in thick black lines) which pass before and behind the joints,…

Forms of muscles and tendons. Labels: A, adductor of thigh; B, biceps of arm; D, deltoid, G, gastrocnemius; P', pronator of forearm; P", pectoral; R, rectus abdominis; R", rectus muscle of thigh; S', serratus magnus of thorax; S", semi-membranosus of thigh.

Forms of Muscles and Tendons

Forms of muscles and tendons. Labels: A, adductor of thigh; B, biceps of arm; D, deltoid, G, gastrocnemius;…

Diagrams illustrating, A, typical muscle with a central belly and two terminal tendons; B, a penniform muscle; C, a bi-penniform muscle.

Muscles of Different Forms

Diagrams illustrating, A, typical muscle with a central belly and two terminal tendons; B, a penniform…

Muscle of the body, back view: The fascia is left upon the left limbs, removed from the right.

Back View of the Muscles of the Body

Muscle of the body, back view: The fascia is left upon the left limbs, removed from the right.

Muscle of the body, front view: On the right half, the superficial muscles; left half, deep-seated muscles.

Front View of the Muscles of the Body

Muscle of the body, front view: On the right half, the superficial muscles; left half, deep-seated muscles.

A front view of the superficial muscles of the body. Labels: 1, The frontal swells of the occipito-frontalis. 2, The orbicularis palpebrarum. 3, The levator labii superioris alaeque nasi. 4, The zygomaticus major. 5, The zygomaticus minor. 6, The masseter. 7, The orbicularis oris. 8, The depressor labii inferioris. 9, The latysma myoides. 10, The deltoid. 11, The pectoralis major. 12, The latissimus dorsi. 13, The serratus major anticus. 14, The biceps flexor cubiti. 15, The triceps extensor cubiti. 16, The supinator radii longus. 17, The pronator radii teres. 18, The extensor carpi radialis longior. 19, The extensor ossis metacarpi pollicis. 20, The annular ligament. 21, The palmar fascia. 22, The obliquus externus abdominis. 26, The psoas magnus. 27, The abducter longus. 28, The sartorius. 29, The rectus femoris. 30, The vastus externus. 31, vastus internus. 32, The tendo patellae. 33, The gastrocnemius. 34, The tibialis anticus. 35, The tibia. 36, The tendons of the extensor communis.

Front View of the Superficial Muscles of the Body

A front view of the superficial muscles of the body. Labels: 1, The frontal swells of the occipito-frontalis.…

Side view of the muscles of the body, showing those that lie directly under the skin. Other deeper muscles are not visible. Muscles vary widely in their shape and size depending on their function.

Side View of the Muscles of the Body

Side view of the muscles of the body, showing those that lie directly under the skin. Other deeper muscles…

Side view of the muscles of the face and neck.

Muscles of the Face and Neck

Side view of the muscles of the face and neck.

"The extensor muscles on the back of the forearm. Note the tendons at the wrist." —Davison, 1910

Muscles of the forearm

"The extensor muscles on the back of the forearm. Note the tendons at the wrist." —Davison, 1910

The muscles of the human body.

Muscles of the Human Body

The muscles of the human body.

Superficial and deep muscles of the trunk. The sternocleidomastoid, pectoralis major, anterior portion of deltoid, the external oblique, aponeurosis of the internal oblique, tensor fasciae latae, sartorius, rectus femoris, iliopsoas, pectineus, adductor longus and the gracilis muscles of the left side have been cut away to expose the underlying muscles. Anterior View.

Anterior View of the Muscles of the Trunk

Superficial and deep muscles of the trunk. The sternocleidomastoid, pectoralis major, anterior portion…

Muscles of the arm

Arm Muscles

Muscles of the arm

Muscles of the arm

Arm Muscles

Muscles of the arm

Muscles of the arm.

Arm Muscles

Muscles of the arm.

Muscles of the arm

Arm Muscles

Muscles of the arm

Muscles of the arm

Arm Muscles

Muscles of the arm

Muscles of the back.

Back Muscles

Muscles of the back.

Muscles of the leg

Leg Muscles

Muscles of the leg

Muscles of the leg

Leg Muscles

Muscles of the leg

Muscles of the leg

Leg Muscles

Muscles of the leg

Muscles of the leg

Leg Muscles

Muscles of the leg

Muscles of the leg

Leg Muscles

Muscles of the leg

Diagrams of typical muscles with a central belly and two terminal tendons. Labels: b, a penniform muscle; c, a bipenniform muscle.

Typical Muscles

Diagrams of typical muscles with a central belly and two terminal tendons. Labels: b, a penniform muscle;…

Muscles of the neck, head, and face.

Upper Muscles

Muscles of the neck, head, and face.

Muscles of the neck, head, and face.

Upper Muscles

Muscles of the neck, head, and face.

Diagram to illustrate the method of obtaining a graphic record of a muscular contraction.

Recording of a Muscular Contraction

Diagram to illustrate the method of obtaining a graphic record of a muscular contraction.

A. Portion of a medium sized human muscular fiber. B. Separated bundles of fibrils equally magnified. Labels: a, larger, and b, smaller collections; c, still smaller; d, smallest which could be detached, possibly representing a single series of sarcous element.

Muscular Fiber

A. Portion of a medium sized human muscular fiber. B. Separated bundles of fibrils equally magnified.…

Three muscular fibers running longitudinally, and two bundles of fibers in transverse section, M, from the tongue. The capillaries, C, are injected.

Muscular Fiber

Three muscular fibers running longitudinally, and two bundles of fibers in transverse section, M, from…

Wave of contraction passing over a muscular fiber of dytiscus, very highly magnified. When a muscle contracts, the dark bands swell up and shorten (the light bands are also constricted), and the whole fiber broadens and shortens. Labels: R, R, portions of the fiber at rest; C, contracted part; I, I, intermediate condition.

Muscular Fiber Contracting

Wave of contraction passing over a muscular fiber of dytiscus, very highly magnified. When a muscle…

Muscular fiber torn across; the sarcolemma still connecting the two parts of the fiber.

Torn Muscular Fiber

Muscular fiber torn across; the sarcolemma still connecting the two parts of the fiber.

The development of muscular fibers from cells. Labels: a, simple cell. b, a pair of cells fused together. c, Three cells fused and their contents assuming the striated character. d, A muscular fiber exhibiting its original composition of cells.

The Development of Muscular Fibers from Cells

The development of muscular fibers from cells. Labels: a, simple cell. b, a pair of cells fused together.…

A diagram of the human muscular system.

A Diagram of the Human Muscular System

A diagram of the human muscular system.

This illustration shows a diagram of nervous and cross-striate muscular tissue, showing the mode of connection between nerve fibres and muscle fibres. A, nerve cell (g) connected with muscle fibre (mf.) by nerve fibre (n.f.). The muscle fibre (m.f.) is composed of numerous fibrils (f) which are made up lengthwise of alternating discs of ligter and darker substance. These fibrils are shown more highly magnified in B and C. In B the fibril is uncontracted; in C it is contracted. D, nerve fibre more highly magnified showing a, axis; m, medullary sheath; and s, Schwann's sheath; ax., axon; d, dendron; n, node; n.m., nerve-muscle plate.

Muscular Tissue

This illustration shows a diagram of nervous and cross-striate muscular tissue, showing the mode of…

A fiber of cross-striped muscular tissue, showing the alternating bands.

Fiber of Muscular Tissue Showing Alternating Bands

A fiber of cross-striped muscular tissue, showing the alternating bands.

Fragment of a fiber of cross-striped muscular tissue, hardened, showing transverse cleavage.

Muscular Tissue Showing Transverse Cleavage

Fragment of a fiber of cross-striped muscular tissue, hardened, showing transverse cleavage.