NationMaster - Encyclopedia: Angle (rib)

The external surface of the rib is convex, smooth, and marked, a little in front of the tubercle, by a prominent line, directed downward and laterally; this gives attachment to a tendon of the Iliocostalis, and is called the angle. Latin is an ancient Indo-European language originally spoken in Latium, the region immediately surrounding Rome. ... Elseviers logo. ... The human rib cage. ... The iliocostalis is the muscle immediately lateral to the longissimus that is the nearest to the furrow that separates the epaxial muscles from the hypaxial. ...

At this point the rib is bent in two directions, and at the same time twisted on its long axis.

If the rib be laid upon its lower border, the portion of the body in front of the angle rests upon this border, while the portion behind the angle is bent medially and at the same time tilted upward; as the result of the twisting, the external surface, behind the angle, looks downward, and in front of the angle, slightly upward.

The distance between the angle and the tubercle is progressively greater from the second to the tenth ribs. The portion between the angle and the tubercle is rounded, rough, and irregular, and serves for the attachment of the Longissimus dorsi.

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant. The public domain comprises the body of all creative works and other knowledge—writing, artwork, music, science, inventions, and others—in which no person or organization has any proprietary interest. ... An illustration from the 1918 edition Henry Grays Anatomy of the Human Body, commonly known as Grays Anatomy after Henry Gray, is an anatomy textbook widely regarded as a classic work on human anatomy. ...

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Bones of torso

sternum: manubrium, body of sternum, xiphoid process, suprasternal notch Grays Anatomy illustration of a human femur. ... The human torso Torso is an anatomical term for the greater part of the human body without the head and limbs. ... The sternum or breastbone is a long, flat bone located in the center of the thorax (chest). ... Sternum or breastbone is a long, flat bone located in the center of the thorax (chest). ... The body of the sternum (gladiolus), considerably lengthier, narrower, and thinner than the manubrium, attains its greatest breadth close to the lower end. ... The xiphoid process is a small cartilaginous extension to the lower part of the sternum which is usually ossified in the adult human. ... This article needs to be cleaned up to conform to a higher standard of quality. ...

rib: first rib, tenth rib, eleventh rib, twelfth rib, floating rib, false ribs, angle, tubercle, costal groove, neck, head The human rib cage. ... The first rib is the most curved and usually the shortest of all the ribs; it is broad and flat, its surfaces looking upward and downward, and its borders inward and outward. ... The tenth rib has only a single articular facet on its head. ... The eleventh rib has a single articular facet on the head, which is of rather large size. ... The twelfth rib has a single articular facet on the head, which is of rather large size. ... the four floating ribs Four of the ribs (two pairs) in the ribcage are said to be floating ribs because they are attached to the vertebrae only, and not to the sternum or cartilage coming off of the sternum. ... Excluding the first seven ribs, the remaining five are false ribs. ...

general vertebral structures: body of vertebra, vertebral arch (pedicle, lamina, vertebral notch), foramina (vertebral, intervertebral), processes (transverse, articular, spinous) The body is the largest part of a vertebra, and is more or less cylindrical in shape. ... The vertebral arch (or neural arch) is the posterior part of a vertebra. ... The pedicles are two short, thick processes, which project backward, one on either side, from the upper part of the body, at the junction of its posterior and lateral surfaces. ... The laminÃ¦ are two broad plates directed backward and medialward from the pedicles. ... The concavities above and below the pedicles are named the vertebral notches; and when the vertebrae are articulated, the notches of each contiguous pair of bones form the intervertebral foramina. ... In a typical vertebra, the vertebral foramen is the foramen formed by the anterior segment (the body), and the posterior part, the vertebral arch. ... When the spinal vertebrae are articulated with each other the bodies form a strong pillar for the support of the head and trunk, and the vertebral foraminae constitute a canal for the protection of the medulla spinalis (spinal cord). ... The transverse processes of a vertebra, two in number, project one at either side from the point where the lamina joins the pedicle, between the superior and inferior articular processes. ... The articular processes of a vertebra, two superior and two inferior, spring from the junctions of the pedicles and laminÃ¦. The superior project upward, and their articular surfaces are directed more or less backward; the inferior project downward, and their surfaces look more or less forward. ... A diagram of a thoracic vertebra. ...

cervical vertebrae: C1 (anterior arch, posterior arch, lateral mass), C2 (dens), C7, posterior tubercle, foramen transversarium A cervical vertebra Cervical vertebrae (Vertebrae cervicales) are the smallest of the true vertebrae, and can be readily distinguished from those of the thoracic or lumbar regions by the presence of a foramen (hole) in each transverse process. ... In anatomy, the atlas (C1) is the topmost (first) cervical vertebra of the spine. ... The anterior arch of the atlas forms about one-fifth of the ring of the atlas: its anterior surface is convex, and presents at its center the anterior tubercle for the attachment of the Longus colli muscles; posteriorly it is concave, and marked by a smooth, oval or circular facet... In a cervical vertebra, the posterior arch forms about two-fifths of the circumference of the ring: it ends behind in the posterior tubercle, which is the rudiment of a spinous process and gives origin to the Recti capitis posteriores minores. ... The lateral masses are the most bulky and solid parts of the atlas, in order to support the weight of the head. ... In anatomy, the second cervical vertebra (C2) of the spine is named the axis or epistropheus. ... The dens or odontoid process of the axis exhibits a slight constriction or neck, where it joins the body. ... The most distinctive characteristic of the seventh cervical vertebra is the existence of a long and prominent spinous process, hence the name vertebra prominens. ... The posterior arch of a cervical vertebra forms about two-fifths of the circumference of the ring: it ends behind in the posterior tubercle, which is the rudiment of a spinous process and gives origin to the Recti capitis posteriores minores. ... The transverse processes of the cervical vertebrae are each pierced by the foramen transversarium, which, in the upper six vertebrÃ¦, gives passage to the vertebral artery and vein and a plexus of sympathetic nerves. ...

thoracic vertebrae: costal facets (superior, inferior, transverse) A typical thoracic vertebra The thoracic vertebrae (vertebrae thoracales) compose the middle segment of the vertebral column, between the cervical vertebrae and the lumbar vertebrae. ... The superior costal facet (or superior costal fovea) is a site where a rib forms a joint with the top of a vertebra. ... The inferior costal facet (or inferior costal fovea) is a site where a rib forms a joint with the bottom of a vertebra. ... The transverse costal facet (or transverse costal fovea) is a site where a rib forms a joint with the transverse process of a vertebra. ...

lumbar vertebrae: accessory process, mammillary process Categories: Anatomy stubs | Anatomy ... Of the tubercles noticed in connection with the transverse processes of the lower thoracic vertebrae, the inferior is situated at the back part of the base of the transverse process, and is called the accessory process. ... Of the three tubercles noticed in connection with the transverse processes of the lower thoracic vertebrae, the superior one is connected in the lumbar region with the back part of the superior articular process, and is named the mammillary process. ...

sacrum/coccyx: pelvic surface (anterior sacral foramina, dorsal surface (posterior sacral foramina, median sacral crest, medial sacral crest, lateral sacral crest), lateral surface, base, sacral hiatus This article or section may be confusing or unclear for some readers, and should be edited to rectify this. ... The coccyx is formed of four fused vertebrae. ... The pelvic surface of sacrum is concave from above downward, and slightly so from side to side. ... At the ends of the transverse ridges of the pelvic surface of the sacrum are seen the anterior sacral foramina (or pelvic sacral foramina), four in number on either side, somewhat rounded in form, diminishing in size from above downward, and directed lateralward and forward; they give exit to the... The dorsal surface of sacrum is convex and narrower than the pelvic. ... Lateral to the articular processes of the sacrum are the four posterior sacral foramina (or dorsal sacral foramina); they are smaller in size and less regular in form than the anterior, and transmit the posterior divisions of the sacral nerves. ... In the middle line of the dorsal surface of the sacrum, it displays a crest, the median sacral crest, surmounted by three or four tubercles, the rudimentary spinous processes of the upper three or four sacral vertebrae. ... On the lateral aspect of the sacral groove is a linear series of tubercles produced by the fusion of the articular processes which together form the indistinct medial sacral crest (intermediate sacral crest, sacral articular crest). ... On the lateral side of the posterior sacral foramina is a series of tubercles, which represent the transverse processes of the sacral vertebrae, and form the lateral sacral crest. ... The lateral surface of sacrum is broad above, but narrowed into a thin edge below. ... The base of the sacrum, which is broad and expanded, is directed upward and forward. ... The laminae of the fifth sacral vertebra, and sometimes those of the fourth, fail to meet behind, and thus a sacral hiatus or deficiency occurs in the posterior wall of the sacral canal. ...