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Muscles of the back. 1, trapezius; 2, its origin; 3, spine of scapula; 4, latissimus dorsi; 5, delltoid; 6, infra-spinatus; 7, external oblique; 8, gluteus medius; 9, gluteus maximus; 10, levator scapulae; 11, rhomboideus minor; 12, rhomboideus major; 13, splenius capitus; 14, splenius colli; 15, origin latissimus dorsi; 16, serratus inferior posticus; 17, supra-rpinatus; 18, infra-pinatus; 19, teres minor; 20, teres major; 21, long head triceps; 22, serratus major anticus; 23, internal oblique.

Back Muscles

Muscles of the back. 1, trapezius; 2, its origin; 3, spine of scapula; 4, latissimus dorsi; 5, delltoid;…

Second layer of muscles of the back. Labels: 1, trapezius; 2, a portion of the ten dinous ellipse formed by the trapezius on both sides; 3, spine of scapula; 4, latissimus dorsi; 5, deltoid; 6, infra-spinatus and teres minor; 7, external oblique; 8, gluteus medius; 9, gluteus magnus; 10, levator scapulae; 11, rhomboideus minor; 12, rhomboideus major; 13, splenius capitis; 14, splenius colli; 15, portion of origin of latissimus dorsi; 16, serratus inferior posticus; 17, supra-spinatus; 18, infra-spinatus; 19, teres minor; 20, teres major; 21, long head of triceps extensor cubiti; 22, serratus major anticus; 23, internal oblique.

Muscles of the Back

Second layer of muscles of the back. Labels: 1, trapezius; 2, a portion of the ten dinous ellipse formed…

Illustration of an oblique cone.

Oblique Cone

Illustration of an oblique cone.

Illustration of the projection of a cone that is obliquely inclined.

Projection Of Cone

Illustration of the projection of a cone that is obliquely inclined.

Illustration of a right circular cone and an oblique cone.

Right and Oblique Cones

Illustration of a right circular cone and an oblique cone.

Illustration of the projection of a cylinder that is obliquely inclined.

Projection Of Cylinder

Illustration of the projection of a cylinder that is obliquely inclined.

The muscles of the right eye. Labels: A, superior straight; B, superior oblique passing through a pulley, D; G, inferior oblique; H, external straight, and , back of it, the internal straight muscle.

Muscles of the Eye

The muscles of the right eye. Labels: A, superior straight; B, superior oblique passing through a pulley,…

"<em>A</em>, attachment of tendon connected with the four recti muscles; <em>B</em>, external rectus, divided and turned downward, to expose the internal rectus; <em>C</em>, inferior rectus; <em>D</em>, internal rectus; <em>E</em>, superior rectus; <em>F</em>, superior oblique; <em>H</em>, pulley and reflected portion of the superior oblique; <em>K</em>, inferior oblique; <em>L</em> and <em>M</em>, portions of the muscle which raises the upper eyelid; to the right of <em>D</em> and to the left on the same line are seen cut ends of the optic nerve." &mdash; Blaisedell, 1904

Muscles of the eyeball

"A, attachment of tendon connected with the four recti muscles; B, external rectus,…

Illustration of a skewed hexagonal pyramid that has been cut by a plane parallel to the base. The top section has been removed and the remaining section is known as the frustum of the pyramid. The hidden edges are shown in this illustration.

Frustum Of A Skewed Hexagonal Pyramid

Illustration of a skewed hexagonal pyramid that has been cut by a plane parallel to the base. The top…

Illustration of the projection of a hexagonal pyramid that is obliquely inclined.

Projection Of Hexagonal Pyramid

Illustration of the projection of a hexagonal pyramid that is obliquely inclined.

"An inclined plane is a smooth, hard, inflexible surface, inclined so as to make an oblique angle with the horizon." -Avery 1895

Inclined Plane

"An inclined plane is a smooth, hard, inflexible surface, inclined so as to make an oblique angle with…

"It is worthy of note that, owing to the oblique direction in which the muscles are commonly inserted into the bones, much of their force is lost so far as producing movement is concerned. Suppose the log of wood in the diagram to be raised by pulling on the rope in the direction a; it is clear at first that the rope will act at a great disadvantage; most of the pull transmitted by it will be exerted against the pivot on which the log hinges, and only a small fraction be available for elevating the latter. But the more the log is lifted, as for example into the position indicated by the dotted lines, the more useful will be the direction of the pull, and the more of it will be spend on the log and the less lost unavailingly in merely increasing the pressure at the hinge." &mdash;Martin, 1917

Oblique Pull

"It is worthy of note that, owing to the oblique direction in which the muscles are commonly inserted…

"Oblique rhombic octahedron." &mdash; Hallock, 1905

Octahedron

"Oblique rhombic octahedron." — Hallock, 1905

Illustration of a skewed pentagonal pyramid that has been cut by a plane parallel to the base. The top section has been removed and the remaining section is known as the frustum of the pyramid. The hidden edges are shown in this illustration.

Frustum Of A Skewed Pentagonal Pyramid

Illustration of a skewed pentagonal pyramid that has been cut by a plane parallel to the base. The top…

Oblique lines drawn from a point to a plane.

Oblique Lines Drawn to a Plane

Oblique lines drawn from a point to a plane.

"Doubly oblique prism." &mdash; Hallock, 1905

Prism

"Doubly oblique prism." — Hallock, 1905

Illustration of a skewed octagonal prism. The prism is non-right.

Skewed Octagonal Prism

Illustration of a skewed octagonal prism. The prism is non-right.

Illustration of a skewed pentagonal prism. The prism is non-right. The hidden edges are shown.

Skewed Pentagonal Prism

Illustration of a skewed pentagonal prism. The prism is non-right. The hidden edges are shown.

Illustration of a skewed pentagonal prism. The prism is non-right. The hidden edges are shown.

Skewed Pentagonal Prism

Illustration of a skewed pentagonal prism. The prism is non-right. The hidden edges are shown.

Illustration of a skewed pentagonal prism. The prism is non-right.

Skewed Pentagonal Prism

Illustration of a skewed pentagonal prism. The prism is non-right.

Illustration of an oblique prism constructed by the combination of three truncated prisms.

Oblique Prism Truncated Into 3 Sections

Illustration of an oblique prism constructed by the combination of three truncated prisms.

"Diagram illustrating the disadvantage of an oblique pull." &mdash; Martin, 1917

Oblique pull

"Diagram illustrating the disadvantage of an oblique pull." — Martin, 1917

Illustration of a non-right, or skewed, hexagonal pyramid with hidden edges shown. The base is a hexagon and the faces are isosceles triangles.

Skewed Hexagonal Pyramid

Illustration of a non-right, or skewed, hexagonal pyramid with hidden edges shown. The base is a hexagon…

Illustration of a non-right, or skewed, rectangular pyramid with hidden edges shown. The base is a rectangle and the faces are isosceles triangles.

Skewed Rectangular Pyramid

Illustration of a non-right, or skewed, rectangular pyramid with hidden edges shown. The base is a rectangle…

Illustration of a stepladder that is opened to form an isosceles triangle with the ground.

Open Stepladder

Illustration of a stepladder that is opened to form an isosceles triangle with the ground.

Illustration of a stepladder that is opened to form an isosceles triangle with the ground.

Open Stepladder

Illustration of a stepladder that is opened to form an isosceles triangle with the ground.

Illustration of a giant stepladder, sometimes called a skyscraper stepladder, that is opened next to a palm tree. One of the bottom legs of the unfolded ladder is adjacent to the tree. The ladder forms an isosceles triangle with the ground.

Skyscraper Giant Stepladder

Illustration of a giant stepladder, sometimes called a skyscraper stepladder, that is opened next to…

Triangle ABC with sides a,b,c labeled and angles A,B,C labeled and h labeled as height.

Triangle ABC With Height h

Triangle ABC with sides a,b,c labeled and angles A,B,C labeled and h labeled as height.

Triangle ABC with sides a,b,c labeled and angles A,B,C labeled and h labeled as height.

Obtuse Triangle ABC With Height h

Triangle ABC with sides a,b,c labeled and angles A,B,C labeled and h labeled as height.

Superior muscles of the upper front of the trunk. Labels: 1, sterno-hyoid; 2, sterno-cleido-mastoid; 3, sterno-thyroid; 4, sterno-cleido-mastoid; 5, edge of the trapezius; 6, clavicle; 7, clavicular origin of the pectoralis major; 8, deltoid; 9, fold of the pectoralis major of the anterior edge of the axilla; 10, middle of the pectoralis major; 11, crossing and interlocking of the fibers of the external oblique of one side with those of the other; 12, biceps flexor cubiti; 13, teres major; 14, serratus major anticus; 15, superior heads of external oblique interlocking with serratus major.

Muscles of the Upper Trunk

Superior muscles of the upper front of the trunk. Labels: 1, sterno-hyoid; 2, sterno-cleido-mastoid;…